{"text_format":"2","workbook":"xlsx","n_sheets":85,"sheets":["Document_and_Entity_Informatio","Consolidated_Balance_Sheets","Consolidated_Balance_Sheets_Pa","Consolidated_Statements_of_Ope","Consolidated_Statements_of_Com","Statements_of_Consolidated_Sha","Statement_of_Consolidated_Shar","Consolidated_Statements_of_Cas","Our_Business","Summary_of_Significant_Account","Recent_Accounting_Guidance","Business_Combinations","Accounts_Receivable_Net_and_Su","Supplemental_Operating_Informa","Supplemental_Cash_Flow_Informa","Identified_Intangible_Assets_a","ShortTerm_and_LongTerm_Debt","SelfInsurance_Accruals","Operating_Lease_Obligations","Common_Shares_and_Preferred_Sh","Accumulated_Other_Comprehensiv","The_Davey_401KSOP_and_Employee","StockBased_Compensation","Defined_Benefit_Pension_Plans","Income_Taxes","Earnings_Per_Share_Information","Operations_by_Business_Segment","Fair_Value_Measurements_and_Fi","Commitments_and_Contingencies","Quarterly_Results_of_Operation","Summary_of_Significant_Account1","Summary_of_Significant_Account2","Accounts_Receivable_Net_and_Su1","Supplemental_Operating_Informa1","Supplemental_Cash_Flow_Informa1","Identified_Intangible_Assets_a1","ShortTerm_and_LongTerm_Debt_Ta","SelfInsurance_Accruals_Tables","Operating_Lease_Obligations_Ta","Common_Shares_and_Preferred_Sh1","Accumulated_Other_Comprehensiv1","StockBased_Compensation_Tables","Defined_Benefit_Pension_Plans_","Income_Taxes_Tables","Earnings_Per_Share_Information1","Operations_by_Business_Segment1","Fair_Value_Measurements_and_Fi1","Quarterly_Results_of_Operation1","Our_Business_Reportable_segmen","Summary_of_Significant_Account3","Summary_of_Significant_Account4","Business_Combinations_Details","Accounts_Receivable_Net_and_Su2","Supplemental_Operating_Informa2","Supplemental_Cash_Flow_Informa2","Identified_Intangible_Assets_a2","Identified_Intangible_Assets_a3","Identified_Intangible_Assets_a4","ShortTerm_and_LongTerm_Debt_Sh","ShortTerm_and_LongTerm_Debt_Lo","ShortTerm_and_LongTerm_Debt_Na","SelfInsurance_Accruals_Details","Operating_Lease_Obligations_De","Common_Shares_and_Preferred_Sh2","Common_Shares_and_Preferred_Sh3","Accumulated_Other_Comprehensiv2","The_Davey_401KSOP_and_Employee1","StockBased_Compensation_Detail","Defined_Benefit_Pension_Plans_1","Defined_Benefit_Pension_Plans_2","Defined_Benefit_Pension_Plans_3","Defined_Benefit_Pension_Plans_4","Defined_Benefit_Pension_Plans_5","Defined_Benefit_Pension_Plans_6","Defined_Benefit_Pension_Plans_7","Defined_Benefit_Pension_Plans_8","Defined_Benefit_Pension_Plans_9","Recovered_Sheet1","Income_Taxes_Details","Earnings_Per_Share_Information2","Operations_by_Business_Segment2","Operations_by_Business_Segment3","Fair_Value_Measurements_and_Fi2","Commitments_and_Contingencies_","Quarterly_Results_of_Operation2"],"not_rendered":{"charts":0,"images":0,"macros":0,"external_links":0,"defined_names":0,"comments":0,"pivot_tables":0},"unopened":[],"bounds":{"document_bytes":16777216,"sheet_cells":100000,"run_cost":"one","rows_first":2000,"rows_last":500,"rows_between":2000,"halvings":0,"cell_chars":16384,"cell_head_chars":4096},"cells_cut":0,"cells_raw":0,"read":"whole","date_system":"1900"}

{"sheet":"Document_and_Entity_Informatio","index":0,"n_rows":17,"n_cols":4,"rows_kept":17,"cut":false,"hidden":false,"merged":[[0,0,1,0]]}
["Document and Entity Information Document (USD $)","12 Months Ended"]
[null,"Dec. 31, 2014","Feb. 27, 2015","Jul. 01, 2014"]
["Entity Information [Line Items]"]
["Entity Registrant Name","DAVEY TREE EXPERT CO"]
["Entity Central Index Key",277638]
["Current Fiscal Year End Date",{"$f":"--12-31","v":-19}]
["Entity Filer Category","Accelerated Filer"]
["Document Type","10-K"]
["Document Period End Date","2014-12-31"]
["Document Fiscal Year Focus",2014]
["Document Fiscal Period Focus","FY"]
["Amendment Flag",false]
["Entity Common Stock, Shares Outstanding",null,13168800]
["Entity Well-known Seasoned Issuer","No"]
["Entity Voluntary Filers","No"]
["Entity Current Reporting Status","Yes"]
["Entity Public Float",null,null,330928487]

{"sheet":"Consolidated_Balance_Sheets","index":1,"n_rows":41,"n_cols":3,"rows_kept":41,"cut":false,"hidden":false,"merged":[[0,1,1,1],[0,2,1,2]]}
["Consolidated Balance Sheets (USD $)","Dec. 31, 2014","Dec. 31, 2013"]
["In Thousands, unless otherwise specified"]
["Current assets:"]
["Cash",18415,15861]
["Accounts receivable, net",111598,105256]
["Operating supplies",6968,5661]
["Prepaid expenses",14088,11393]
["Other current assets",16127,13845]
["Total current assets",167196,152016]
["Property and equipment:"]
["Land and land improvements",16553,13904]
["Buildings and leasehold improvements",33644,27364]
["Equipment",482752,442882]
["Property and equipment",532949,484150]
["Less accumulated depreciation",372066,347266]
["Property and equipment, net",160883,136884]
["Other assets",18862,16917]
["Identified intangible assets and goodwill, net",34063,27561]
["Total assets",381004,333378]
["Current liabilities:"]
["Short-term debt",8281,8434]
["Accounts payable",42140,37922]
["Accrued expenses",34925,36858]
["Self-insurance accruals",23007,22057]
["Total current liabilities",108353,105271]
["Long-term debt",51306,20034]
["Senior unsecured notes",30000,30000]
["Self-insurance accruals",35886,34655]
["Other liabilities",18968,12280]
["Total liabilities",244513,202240]
["Common shareholders' equity:"]
["Common shares, $1.00 par value, per share; 24,000 shares authorized; 21,457 shares issued and outstanding before treasury shares as of December 31, 2014 and 2013",21457,21457]
["Additional paid-in capital",9461,5008]
["Common shares subscribed",9381,10467]
["Retained earnings",251470,230975]
["Accumulated other comprehensive loss",-11523,-4393]
["Stockholders' equity before treasury stock",280246,263514]
["Less: Cost of Common shares held in treasury; 8,292 shares in 2014 and 8,018 in 2013",138155,125034]
["Common shares subscription receivable",5600,7342]
["Common shareholders' equity",136491,131138]
["Total liabilities and shareholders' equity",381004,333378]

{"sheet":"Consolidated_Balance_Sheets_Pa","index":2,"n_rows":9,"n_cols":5,"rows_kept":9,"cut":false,"hidden":false,"merged":[]}
["Consolidated Balance Sheets (Parenthetical) (USD $)","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012","Dec. 31, 2011"]
["Common stock, par value",1,1]
["Common stock, shares authorized",24000000,24000000]
["Common stock, shares issued",21456880,21456880,21456880]
["Common stock, shares outstanding",13165000,13439000,13726000]
["Treasury stock, shares",8291947,8018269,7730878]
["Common Stock [Member]"]
["Common stock, shares issued",21457000,21457000,21457000,21457000]
["Common stock, shares outstanding",21456880,21456880]

{"sheet":"Consolidated_Statements_of_Ope","index":3,"n_rows":26,"n_cols":4,"rows_kept":26,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Consolidated Statements of Operations (USD $)","12 Months Ended"]
["In Thousands, except Share data, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Revenues",789911,713848,680153]
["Costs and expenses:"]
["Operating",508677,462646,437332]
["Selling",140027,120842,111578]
["General and administrative",54970,50654,48171]
["Depreciation",40970,38231,37365]
["Amortization of intangible assets",2070,1980,1742]
["Gain on sale of assets, net",-806,-1294,-1802]
["Costs and Expenses",745908,673059,634386]
["Income from operations",44003,40789,45767]
["Other income (expense):"]
["Interest expense",-2948,-2708,-2698]
["Interest income",295,311,200]
["Other",-3050,-2827,-2611]
["Income before income taxes",38300,35565,40658]
["Income taxes",15131,12712,16063]
["Net income",23169,22853,24595]
["Share data:"]
["Earnings per share--basic:",1.68,1.61,1.74]
["Earnings per share--diluted:",1.63,1.57,1.68]
["Weighted-average shares outstanding:"]
["Basic",13821223,14170681,14102366]
["Diluted",14238276,14602432,14608857]
["Dividends declared per share",0.185,0.18,0.17749999999999999]

{"sheet":"Consolidated_Statements_of_Com","index":4,"n_rows":15,"n_cols":4,"rows_kept":15,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Consolidated Statements of Comprehensive Income (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Net income",23169,22853,24595]
["Other comprehensive income (loss), net of tax:"]
["Foreign currency translation adjustments (losses)/gains",-2798,-1864,561]
["Change in deferred gains on cash flow hedges",0,0,77]
["Defined benefit pension plans:"]
["Net (loss)/gain arising during the year",-6023,3717,-2170]
["Amortization of defined benefit pension items:"]
["Net actuarial loss",1682,861,752]
["Prior service cost",-9,-8,-9]
["Amortization of defined benefit pension items:",1691,869,761]
["Defined benefit pension plan adjustments",-4332,4586,-1409]
["Total other comprehensive income (loss), net of tax",-7130,2722,-771]
["Comprehensive income",16039,25575,23824]

{"sheet":"Statements_of_Consolidated_Sha","index":5,"n_rows":85,"n_cols":9,"rows_kept":85,"cut":false,"hidden":false,"merged":[[0,7,1,7],[0,8,1,8],[0,1,1,1],[0,2,1,2],[0,3,1,3],[0,4,1,4],[0,5,1,5],[0,6,1,6]]}
["Statements of Consolidated Shareholders' Equity (USD $)","Total","Common shares","Additional paid-in capital","Common shares subscribed, unissued","Retained earnings","Accumulated other comprehensive income (loss), net of tax","Common shares held in treasury","Common shares subscription receivable"]
["In Thousands, except Share data, unless otherwise specified"]
["Balance at the beginning of the year at Dec. 31, 2011",-6344,{"$nulls":4},-6344]
["Balance at beginning of year, value at Dec. 31, 2011",null,-21457,-1721,0,-188613,null,104721,0]
["Common shares, at beginning of year at Dec. 31, 2011",null,21457000]
["Share subscriptions, beginning balance, shares at Dec. 31, 2011",null,null,null,0,null,null,null,0]
["Balance at beginning of year, shares at Dec. 31, 2011",{"$nulls":6},7611000]
["Increase (Decrease) in Stockholders' Equity [Roll Forward]"]
["Shares sold to employees, value",null,null,1742,null,null,null,4390]
["Options exercised, value",null,null,-2100,null,null,null,-5197]
["Subscription shares, issued, value",null,null,428,null,null,null,1078]
["Stock-based compensation",null,null,1640]
["Common shares, subscribed, value",null,null,null,-12563,null,null,null,-9732]
["Common shares, subscribed, shares",null,null,null,-638000,null,null,null,-638000]
["Common shares, issued, value",null,null,null,-1508,null,null,null,-517]
["Common shares, issued, shares",null,null,null,-77000,null,null,null,-77000]
["Cancellations, value",null,null,null,0,null,null,null,0]
["Cancellations, shares",null,null,null,0,null,null,null,0]
["Net income",24595,null,null,null,24595]
["Dividends",{"$nulls":4},-2556]
["Currency translation adjustments",{"$nulls":5},561]
["Net gain (loss) on interest rate contracts",77,{"$nulls":4},77]
["Defined benefit pension plans",1409,{"$nulls":4},-1409]
["Shares purchased, value",{"$nulls":6},-18103]
["Shares purchased, shares",{"$nulls":6},892000]
["Shares sold to employees, shares",{"$nulls":6},-327000]
["Options exercised, shares",{"$nulls":6},-368000]
["Subscription shares, issued, shares",{"$nulls":6},-77000]
["Balance at the end of the year at Dec. 31, 2012",-7115,{"$nulls":4},-7115]
["Balance at ending of year, value at Dec. 31, 2012",-118106,-21457,-3431,-11055,-210652,null,112159,-9215]
["Common shares, at end of year at Dec. 31, 2012",21456880,21457000]
["Share subscriptions, ending balance, shares at Dec. 31, 2012",null,null,null,-561000,null,null,null,-561000]
["Balance at ending of year, shares at Dec. 31, 2012",13726000,{"$nulls":5},7731000]
["Increase (Decrease) in Stockholders' Equity [Roll Forward]"]
["Shares sold to employees, value",null,null,2745,null,null,null,3853]
["Options exercised, value",null,null,-2273,null,null,null,-4776]
["Subscription shares, issued, value",null,null,98,null,null,null,383]
["Stock-based compensation",null,null,1007]
["Common shares, subscribed, value",null,null,null,0,null,null,null,0]
["Common shares, subscribed, shares",null,null,null,0,null,null,null,0]
["Common shares, issued, value",null,null,null,-409,null,null,null,-1728]
["Common shares, issued, shares",null,null,null,-21000,null,null,null,-21000]
["Cancellations, value",null,null,null,-179,null,null,null,-145]
["Cancellations, shares",null,null,null,-9000,null,null,null,-9000]
["Net income",22853,null,null,null,22853]
["Dividends",{"$nulls":4},-2530]
["Currency translation adjustments",{"$nulls":5},-1864]
["Net gain (loss) on interest rate contracts",0,{"$nulls":4},0]
["Defined benefit pension plans",-4586,{"$nulls":4},4586]
["Shares purchased, value",{"$nulls":6},-21887]
["Shares purchased, shares",931078,{"$nulls":5},931000]
["Shares sold to employees, shares",-299330,{"$nulls":5},-299000]
["Options exercised, shares",{"$nulls":6},-319000]
["Subscription shares, issued, shares",{"$nulls":6},-26000]
["Balance at the end of the year at Dec. 31, 2013",-4393,{"$nulls":4},-4393]
["Balance at ending of year, value at Dec. 31, 2013",-131138,-21457,-5008,-10467,-230975,null,125034,-7342]
["Common shares, at end of year at Dec. 31, 2013",21456880,21457000]
["Share subscriptions, ending balance, shares at Dec. 31, 2013",null,null,null,-531000,null,null,null,-531000]
["Balance at ending of year, shares at Dec. 31, 2013",13439000,21456880,{"$nulls":4},8018000]
["Increase (Decrease) in Stockholders' Equity [Roll Forward]"]
["Shares sold to employees, value",null,null,3417,null,null,null,3822]
["Options exercised, value",null,null,-273,null,null,null,-1861]
["Subscription shares, issued, value",null,null,184,null,null,null,794]
["Stock-based compensation",null,null,1125]
["Common shares, subscribed, value",-12563,null,null,0,null,null,null,0]
["Common shares, subscribed, shares",-637714,null,null,0,null,null,null,0]
["Common shares, issued, value",null,null,null,-758,null,null,null,-1543]
["Common shares, issued, shares",null,null,null,-39000,null,null,null,-39000]
["Cancellations, value",null,null,null,-328,null,null,null,-199]
["Cancellations, shares",null,null,null,-16000,null,null,null,-16000]
["Net income",23169,null,null,null,23169]
["Dividends",{"$nulls":4},-2674]
["Currency translation adjustments",{"$nulls":5},-2798]
["Net gain (loss) on interest rate contracts",0,{"$nulls":4},0]
["Defined benefit pension plans",4332,{"$nulls":4},-4332]
["Shares purchased, value",{"$nulls":6},-19598]
["Shares purchased, shares",727436,{"$nulls":5},727000]
["Shares sold to employees, shares",-287536,{"$nulls":5},-287000]
["Options exercised, shares",-74715,{"$nulls":5},-116000]
["Subscription shares, issued, shares",{"$nulls":6},-50000]
["Balance at the end of the year at Dec. 31, 2014",-11523,{"$nulls":4},-11523]
["Balance at ending of year, value at Dec. 31, 2014",-136491,-21457,-9461,-9381,-251470,null,138155,-5600]
["Common shares, at end of year at Dec. 31, 2014",21456880,21457000]
["Share subscriptions, ending balance, shares at Dec. 31, 2014",null,null,null,-476000,null,null,null,-476000]
["Balance at ending of year, shares at Dec. 31, 2014",13165000,21456880,{"$nulls":4},8292000]

{"sheet":"Statement_of_Consolidated_Shar","index":6,"n_rows":3,"n_cols":4,"rows_kept":3,"cut":false,"hidden":false,"merged":[[0,0,1,0],[0,1,0,3]]}
["Statement of Consolidated Shareholders' Equity (Parenthetical) (USD $)","12 Months Ended"]
[null,"Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Dividends",0.185,0.18,0.17749999999999999]

{"sheet":"Consolidated_Statements_of_Cas","index":7,"n_rows":35,"n_cols":4,"rows_kept":35,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Consolidated Statements of Cash Flow (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Operating activities"]
["Net income",23169,22853,24595]
["Adjustments to reconcile net income to net cash provided by operating activities:"]
["Depreciation",40970,38231,37365]
["Amortization",2070,1980,1742]
["Gain on sale of assets",-806,-1294,-1802]
["Deferred income taxes",-2679,1716,-3607]
["Other",-5638,-3228,3493]
["Changes in operating assets and liabilities:"]
["Accounts receivable",-4489,10307,-24294]
["Accounts payable and accrued expenses",1206,-2308,-1145]
["Self-insurance accruals",2116,-5021,4468]
["Other assets, net",-6640,-6926,3121]
["Adjustments to reconcile net income to net cash provided by operating activities",26110,33457,19341]
["Net cash provided by operating activities",49279,56310,43936]
["Capital expenditures:"]
["Equipment",-46228,-42462,-29294]
["Land and buildings",-9503,-2743,-440]
["Proceeds from sales of property and equipment",1366,2080,2955]
["Purchases of businesses",-9695,-80,-4400]
["Net cash used in investing activities",-64060,-43205,-31179]
["Financing activities"]
["Revolving credit facility borrowings/(payments), net",24500,-4200,4200]
["Borrowings/(payments) of notes payable",-1091,1442,1155]
["Borrowings/(payments) of long-term debt and capital leases",5695,-583,-649]
["Purchase of common shares for treasury",-19598,-21887,-18103]
["Sale of common shares from treasury",8762,9582,10735]
["Cash received on common-share subscriptions",1741,1285,1841]
["Dividends",-2674,-2530,-2556]
["Net cash provided by (used in) financing activities",17335,-16891,-3377]
["Increase (Decrease) in cash and cash equivalents",2554,-3786,9380]
["Cash and cash equivalents, beginning of year",15861,19647,10267]
["Cash and cash equivalents, end of year",18415,15861,19647]

{"sheet":"Our_Business","index":8,"n_rows":11,"n_cols":2,"rows_kept":11,"cut":false,"hidden":false,"merged":[[0,0,1,0],[3,0,10,0]]}
["Our Business","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Accounting Policies [Abstract]"]
["Our Business","Our Business"]
[]
[null,"We provide a wide range of arboriculture, horticulture, environmental and consulting services to residential, utility, commercial and government entities throughout the United States and Canada. We have two reportable operating segments organized by type or class of customer: Residential and Commercial, and Utility."]
[null,"Residential and Commercial--Residential and Commercial provides services to our residential and commercial customers including: the treatment, preservation, maintenance, removal, planting of trees, shrubs and other plant life; the practice of landscaping, grounds maintenance, tree surgery, tree feeding and tree spraying; the application of fertilizer, herbicides and insecticides; and, natural resource management and consulting, forestry research and development, and environmental planning."]
[null,"Utility--Utility is principally engaged in providing services to our utility customers--investor-owned, municipal utilities, and rural electric cooperatives--including: the practice of line-clearing and vegetation management around power lines, rights-of-way and chemical brush control; and, natural resource management and consulting, forestry research and development and environmental planning."]
[null,"We also maintain research, technical support and laboratory diagnostic facilities."]
[]
[null,"When we refer to “we,” “us,” “our,” “Davey Tree,” and the “Company,” we mean The Davey Tree Expert Company, unless the context indicates otherwise."]

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["Summary of Significant Accounting Policies","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Accounting Policies [Abstract]"]
["Summary of Significant Accounting Policies","Summary of Significant Accounting Policies"]
[]
[null,"Principles of Consolidation and Basis of Presentation--The consolidated financial statements include the accounts of Davey Tree and our wholly-owned subsidiaries and were prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) as codified in the Financial Accounting Standards Board (\"FASB\") Accounting Standards Codification (\"ASC\"). Intercompany accounts and transactions have been eliminated in consolidation."]
[]
[null,"Use of Estimates in Financial Statement Preparation--The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect reported amounts. Estimates are used for, but not limited to, accounts receivable valuation, depreciable lives of fixed assets, self-insurance accruals, and revenue recognition. Actual results could differ from those estimates."]
[]
[null,"Property and Equipment--Property and equipment are stated at cost. Repair and maintenance costs are expensed as incurred. Depreciation is computed for financial reporting purposes by the straight-line method for land improvements, building and leasehold improvements and by the declining-balance method for equipment, based on the estimated useful lives of the assets, as follows:"]
[]
[]
[null,"Land improvements","5 to 20 years"]
[null,"Buildings","5 to 20 years"]
[null,"Equipment","3 to 10 years"]
[null,"Leasehold improvements","Shorter of lease term or estimated useful life; ranging from 5-to-20 years"]
[]
[null,"Intangible Assets--Intangible assets with finite lives, primarily customer lists, noncompete agreements and tradenames, are amortized by the straight-line method based on their estimated useful lives, ranging from one-to-ten years."]
[]
[null,"Long-Lived Assets--We assess potential impairment to our long-lived assets, other than goodwill, when there is evidence that events or changes in circumstances have made recovery of the asset’s carrying value unlikely and the carrying amount of the asset exceeds the estimated future undiscounted cash flow. In the event the assessment indicates that the carrying amounts "]
[]
[null,"B.","Summary of Significant Accounting Policies (continued)"]
[]
[null,"may not be recoverable, an impairment loss would be recognized to reduce the asset’s carrying amount to its estimated fair value based on the present value of the estimated future cash flows."]
[]
[null,"Goodwill--Goodwill is recorded when the cost of acquired businesses exceeds the fair value of the identified net assets acquired. Goodwill is not amortized, but tested for impairment annually or when events or circumstances indicate that impairment may have occurred. Annually, we perform the impairment tests for goodwill during the fourth quarter. Impairment of goodwill is tested at the reporting-unit level, which for us are also our business segments. Impairment of goodwill is tested by comparing the reporting unit’s carrying value, including goodwill, to the fair value of the reporting unit. The fair values of the reporting units are estimated using discounted projected cash flows. If the carrying value of the reporting unit exceeds its fair value, goodwill is considered impaired and a second step is performed to measure the amount of impairment loss, if any. We conducted our annual impairment tests and determined that no impairment loss was required to be recognized in 2014 or for any prior periods. There were no events or circumstances from the date of our assessment through December 31, 2014 that would impact this conclusion."]
[]
[null,"Self-Insurance Accruals--We are generally self-insured for losses and liabilities related primarily to workers’ compensation, vehicle liability and general liability claims. We use commercial insurance as a risk-reduction strategy to minimize catastrophic losses. Ultimate losses are accrued based upon estimates of the aggregate liability for claims incurred using certain actuarial assumptions followed in the insurance industry and based on Company-specific experience."]
[]
[null,"Our self-insurance accruals include claims for which the ultimate losses will develop over a period of years. Accordingly, our estimates of ultimate losses can change as claims mature. Our accruals also are affected by changes in the number of new claims incurred and claim severity. The methods for estimating the ultimate losses and the total cost of claims were determined by third-party consulting actuaries; the resulting accruals are reviewed by management, and any adjustments arising from changes in estimates are reflected in income."]
[]
[null,"The workers' compensation accruals are discounted as the amount and timing of cash payments related to those accruals are reliably determinable given the nature of workers' compensation benefits and the level of historical claim volume to support the actuarial assumptions and judgments used to derive the expected loss payment pattern. The workers' compensation accruals are discounted using an interest rate that approximates the long-term investment yields over the expected payment pattern of unpaid losses."]
[]
[null,"Our self-insurance accruals are based on estimates and, while we believe that the amounts accrued are adequate and not excessive, the ultimate claims may be in excess of or less than the amounts provided."]
[]
[null,"Stock-Based Compensation--Stock-based compensation cost for all share-based payment plans is measured at fair value on the date of grant and recognized over the employee service period on the straight-line recognition method for awards expected to vest. The fair value of all stock-based payment plans—stock option plans, stock-settled stock appreciation rights, and performance-based restricted stock units as well as our Employee Stock Purchase Plan—is determined by the number of awards granted and the price of our common stock. The fair value of each award is estimated on the date of grant using a binomial option-pricing model. The binomial model considers a range of assumptions related to volatility, risk-free interest rate and employee exercise behavior. Expected volatilities utilized in the binomial model are based on historical volatility of our share prices and other factors. Similarly, the dividend yield is based on historical experience and expected future changes. The binomial model also incorporates exercise and forfeiture assumptions based on an analysis of historical data. The expected life of the stock-based awards is derived from the output of the binomial model and represents the period of time that awards granted are expected to be outstanding."]
[]
[null,"Defined Benefit Pension Plans--We record annual expenses relating to our defined benefit pension plans based on calculations that include various actuarial assumptions, including discount rates and expected long-term rates of return on plan assets. Actuarial assumptions are reviewed annually with modifications made to the assumptions, if necessary, based on current rates and trends. The effects of the actuarial gains or losses are amortized over future service periods. The funded status (that is, the projected benefit obligation less the fair value of plan assets) for each plan is reported in our balance sheet "]
[]
[null,"B.","Summary of Significant Accounting Policies (continued)"]
[]
[null,"using a December 31 measurement date. Changes in the funded status of the plans are recognized in the year in which the changes occur and reported in comprehensive income (loss)."]
[]
[null,"Income Taxes--We compute taxes on income in accordance with the tax rules and regulations where the income is earned. The income tax rates imposed by these taxing authorities vary. Taxable income may differ from pretax income for financial reporting purposes. We compute and recognize deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial statement carrying amounts and the tax bases of our assets and liabilities. Changes in tax rates and laws are reflected in income in the period when such changes are enacted. We account for uncertain tax positions by recognizing the financial statement effects of a tax position only when, based upon the technical merits, it is more-likely-than-not that the position will be sustained upon examination."]
[]
[null,"Earnings Per Share--Basic earnings per share is determined by dividing the income available to common shareholders by the weighted-average number of common shares outstanding. Diluted earnings per share is computed similarly to basic earnings per share except that the weighted-average number of shares is increased to include the effect of stock awards that were granted and outstanding during the period."]
[]
[null,"Revenue Recognition--Revenues from residential and commercial services are recognized as the services are provided and amounts are determined to be collectible. Revenues from contractual arrangements, primarily with utility services customers, are recognized based on costs incurred to total estimated contract costs. During the performance of such contracts, estimated final contract prices and costs are periodically reviewed and revisions are made, as required, to the revenue recognized. On cost-plus-fee contracts, revenue is recognized to the extent of costs incurred plus a proportionate amount of fees earned, and on time-and-material contracts, revenue is recognized to the extent of billable rates times hours worked, plus material and other reimbursable costs incurred. Revisions arise in the normal course of providing services to utility services customers and generally relate to changes in contract specifications and cost allowability. Such revisions are recorded when realization is probable and can be reliably estimated."]
[]
[null,"Concentration of Credit Risk--Credit risk represents the accounting loss that would be recognized if the counterparties failed to perform as contracted. The principal financial instruments subject to credit risk follow:"]
[]
[null,"Cash--To limit our exposure, we transact our business and maintain banking relationships and our derivative contracts with high credit-quality financial institutions."]
[]
[null,"Accounts Receivable--Our residential and commercial customers are located geographically throughout the United States and Canada and, as to commercial customers, within differing industries; thus, minimizing credit risk. The credit exposure of utility services customers is directly affected by conditions within the utility industries as well as the financial condition of individual customers. One utility customer approximated 8% of revenues during 2014, 9% in 2013 and 10% in 2012. To reduce credit risk, we evaluate the credit of customers, but generally do not require advance payments or collateral. Exposure to losses on receivables is principally dependent on each customer’s financial condition."]
[]
[null,"Currency Translation Adjustments--All assets and liabilities of our Canadian operations are translated into United States dollars at year-end exchange rates while revenues and expenses are translated at weighted-average exchange rates in effect during the year. Translation adjustments are recorded as accumulated other comprehensive income (loss) in shareholders’ equity."]
[]
[null,"Interest Rate Risk Management--We have entered into interest rate contracts, from time-to-time, with the objective of altering interest rate exposures related to variable rate debt. In the interest rate contracts, we have agreed with a financial institution to exchange, at specified intervals, the difference between fixed and floating interest amounts calculated on an agreed-upon notional principal amount."]
[]
[null,"Comprehensive Income (Loss)--Comprehensive income (loss) includes net income and other comprehensive income or loss. Other comprehensive income (loss) refers to revenues, expenses, gains and losses that under U.S. GAAP are included in "]
[]
[]
[null,"B.","Summary of Significant Accounting Policies (continued)"]
[]
[null,"comprehensive income but are excluded from net income as these amounts are recorded directly as an adjustment to shareholders’ equity, net of tax."]

{"sheet":"Recent_Accounting_Guidance","index":10,"n_rows":10,"n_cols":2,"rows_kept":10,"cut":false,"hidden":false,"merged":[[0,0,1,0],[3,0,9,0]]}
["Recent Accounting Guidance","12 Months Ended"]
[null,"Dec. 31, 2014"]
["New Accounting Pronouncements and Changes in Accounting Principles [Abstract]"]
["Recent Accounting Guidance","Recent Accounting Guidance"]
[]
[null,"Accounting Standards Update 2014-09, Revenue from Contracts with Customers (Topic 606)--In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (\"Topic 606\"),” which will replace all current U.S. GAAP guidance on revenue recognition and eliminate all industry-specific guidance. "]
[]
[null,"The new revenue recognition guidance provides a unified model to determine when and how revenue is recognized. The underlying principle is that an entity should recognize revenue to depict the transfer of promised goods and services to customers in an amount that reflects the consideration for which the entity expects in exchange for those goods and services. The guidance provides a five-step analysis of transactions to determine when and how revenue is recognized. Other major provisions include capitalization of certain contract costs, consideration of the time value of money in the transaction price, and allowing estimates of variable consideration to be recognized before contingencies are resolved in certain circumstances. The guidance also requires enhanced information to be presented in the financial statements regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from an entity’s contracts with customers."]
[]
[null,"Unless the FASB delays the effective date of the new guidelines, it will be effective for Davey Tree beginning January 1, 2017 and can be applied either retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption. Early adoption is not permitted. We are currently evaluating the methods of adoption as well as the impact that it may have, if any, on our consolidated financial statements. The new revenue guidance will supersede existing revenue guidance affecting our Company, and may also affect our business processes and our information technology systems. As a result, our evaluation of the effect of the new revenue guidance will extend over future periods."]

{"sheet":"Business_Combinations","index":11,"n_rows":10,"n_cols":2,"rows_kept":10,"cut":false,"hidden":false,"merged":[[0,0,1,0],[3,0,9,0]]}
["Business Combinations","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Business Combinations [Abstract]"]
["Business combinations","Business Combinations"]
[]
[null,"Our investments in businesses were: (a) $12,853 in 2014, including $1,078 liabilities assumed and debt issued of $2,080; (b) $110 in 2013, including no liabilities assumed and $30 debt issued; and (c) $6,368 in 2012, including liabilities assumed of $1,868 and $100 debt issued."]
[]
[null,"The net assets of the businesses acquired are accounted for under the acquisition method and were recorded at their fair values at the dates of acquisition. The excess of the purchase price over the estimated fair values of the net assets acquired was recorded as an increase in goodwill of approximately $4,624 in 2014 (all of which is deductible for tax purposes), no goodwill in 2013 and $1,820 in 2012 (of which $258 is deductible for tax purposes). "]
[]
[null,"The results of operations of acquired businesses have been included in the consolidated statements of operations beginning as of the effective dates of acquisition. The effect of these acquisitions on our consolidated revenues and results of operations, either individually or in the aggregate, for the years ended December 31, 2014, 2013 or 2012 was not significant."]

{"sheet":"Accounts_Receivable_Net_and_Su","index":12,"n_rows":89,"n_cols":8,"rows_kept":89,"cut":false,"hidden":false,"merged":[[88,7,89,7],[88,8,89,8],[0,0,1,0],[0,1,0,8],[1,1,1,8],[2,1,2,8],[3,0,89,0],[3,1,3,8],[4,1,4,8],[5,1,5,8],[88,1,89,1],[88,2,89,2],[88,3,89,3],[88,4,89,4],[88,5,89,5],[88,6,89,6],[86,1,87,1],[86,2,87,3],[86,4,87,4],[86,5,87,5],[86,6,87,7],[86,8,87,8],[82,7,83,7],[82,8,83,8],[84,1,85,1],[84,2,85,3],[84,4,85,4],[84,5,85,5],[84,6,85,7],[84,8,85,8],[82,1,83,1],[82,2,83,2],[82,3,83,3],[82,4,83,4],[82,5,83,5],[82,6,83,6],[74,7,75,7],[74,8,75,8],[78,1,78,8],[80,2,80,8],[81,2,81,4],[81,6,81,8],[76,1,76,8],[77,1,77,8],[74,1,75,1],[74,2,75,2],[74,3,75,3],[74,4,75,4],[74,5,75,5],[74,6,75,6],[72,1,73,1],[72,2,73,3],[72,4,73,4],[72,5,73,5],[72,6,73,7],[72,8,73,8],[70,1,71,1],[70,2,71,3],[70,4,71,4],[70,5,71,5],[70,6,71,7],[70,8,71,8],[68,1,69,1],[68,2,69,3],[68,4,69,4],[68,5,69,5],[68,6,69,7],[68,8,69,8],[66,1,67,1],[66,2,67,3],[66,4,67,4],[66,5,67,5],[66,6,67,7],[66,8,67,8],[62,7,63,7],[62,8,63,8],[64,1,65,1],[64,2,65,3],[64,4,65,4],[64,5,65,5],[64,6,65,7],[64,8,65,8],[62,1,63,1],[62,2,63,2],[62,3,63,3],[62,4,63,4],[62,5,63,5],[62,6,63,6],[52,7,53,7],[52,8,53,8],[58,1,58,8],[60,2,60,8],[61,2,61,4],[61,6,61,8],[54,1,54,8],[55,1,55,8],[52,1,53,1],[52,2,53,2],[52,3,53,3],[52,4,53,4],[52,5,53,5],[52,6,53,6],[50,1,51,1],[50,2,51,3],[50,4,51,4],[50,5,51,5],[50,6,51,7],[50,8,51,8],[48,1,49,1],[48,2,49,3],[48,4,49,4],[48,5,49,5],[48,6,49,7],[48,8,49,8],[44,7,45,7],[44,8,45,8],[46,1,47,1],[46,2,47,3],[46,4,47,4],[46,5,47,5],[46,6,47,7],[46,8,47,8],[44,1,45,1],[44,2,45,2],[44,3,45,3],[44,4,45,4],[44,5,45,5],[44,6,45,6],[36,7,37,7],[36,8,37,8],[40,1,40,8],[42,2,42,8],[43,2,43,4],[43,6,43,8],[38,1,38,8],[39,1,39,8],[36,1,37,1],[36,2,37,2],[36,3,37,3],[36,4,37,4],[36,5,37,5],[36,6,37,6],[34,1,35,1],[34,2,35,3],[34,4,35,4],[34,5,35,5],[34,6,35,7],[34,8,35,8],[32,1,33,1],[32,2,33,3],[32,4,33,4],[32,5,33,5],[32,6,33,7],[32,8,33,8],[28,7,29,7],[28,8,29,8],[30,1,31,1],[30,2,31,3],[30,4,31,4],[30,5,31,5],[30,6,31,7],[30,8,31,8],[28,1,29,1],[28,2,29,2],[28,3,29,3],[28,4,29,4],[28,5,29,5],[28,6,29,6],[18,7,19,7],[18,8,19,8],[24,1,24,8],[26,2,26,8],[27,2,27,4],[27,6,27,8],[20,1,20,8],[21,1,21,8],[22,1,22,8],[23,1,23,8],[18,1,19,1],[18,2,19,2],[18,3,19,3],[18,4,19,4],[18,5,19,5],[18,6,19,6],[16,1,17,1],[16,2,17,3],[16,4,17,4],[16,5,17,5],[16,6,17,7],[16,8,17,8],[14,1,15,1],[14,2,15,3],[14,4,15,4],[14,5,15,5],[14,6,15,7],[14,8,15,8],[10,7,11,7],[10,8,11,8],[12,1,13,1],[12,2,13,3],[12,4,13,4],[12,5,13,5],[12,6,13,7],[12,8,13,8],[6,1,6,8],[8,2,8,8],[9,2,9,4],[9,6,9,8],[10,1,11,1],[10,2,11,2],[10,3,11,3],[10,4,11,4],[10,5,11,5],[10,6,11,6]]}
["Accounts Receivable, Net and Supplemental Balance Sheet Information","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Accounts Receivable, Net and Supplemental Balance Sheet Information [Abstract]"]
["Accounts Receivable, Net and Supplemental Balance Sheet Information","Accounts Receivable, Net and Supplemental Balance Sheet Information"]
[]
[null,"Accounts receivable, net, consisted of the following:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Accounts receivable","$",98657,null,null,"$",93156]
[]
[null,"Receivables under contractual arrangements",15362,null,null,null,14309]
[]
[null,null,114019,null,null,null,107465]
[]
[null,"Less allowances for doubtful accounts",2421,null,null,null,2209]
[]
[null,null,"$",111598,null,null,"$",105256]
[]
[]
[null,"Receivables under contractual arrangements consist of work-in-process in accordance with the terms of contracts, primarily, with utility services customers."]
[]
[null,"The following items comprise the amounts included in the balance sheets:"]
[]
[]
[null,null,"December 31,"]
[null,"Other current assets",2014,null,null,null,2013]
[null,"Refundable income taxes","$",2122,null,null,"$",5317]
[]
[null,"Deferred income taxes",8927,null,null,null,7715]
[]
[null,"Note receivable",4319,null,null,null,"—"]
[]
[null,"Other",759,null,null,null,813]
[]
[null,"Total","$",16127,null,null,"$",13845]
[]
[]
[]
[]
[]
[null,null,"December 31,"]
[null,"Other assets, noncurrent",2014,null,null,null,2013]
[null,"Assets invested for self-insurance","$",13684,null,null,"$",12716]
[]
[null,"Investment--cost-method affiliate",1168,null,null,null,1168]
[]
[null,"Deferred income taxes",1705,null,null,null,"—"]
[]
[null,"Other",2305,null,null,null,3033]
[]
[null,"Total","$",18862,null,null,"$",16917]
[]
[]
[]
[]
[null,"E.","Accounts Receivable, Net and Supplemental Balance Sheet Information (continued)"]
[]
[]
[null,null,"December 31,"]
[null,"Accrued expenses",2014,null,null,null,2013]
[null,"Employee compensation","$",19195,null,null,"$",18578]
[]
[null,"Accrued compensated absences",8034,null,null,null,6953]
[]
[null,"Self-insured medical claims",2722,null,null,null,2503]
[]
[null,"Customer advances, deposits",2030,null,null,null,2191]
[]
[null,"Taxes, other than income",2054,null,null,null,5730]
[]
[null,"Other",890,null,null,null,903]
[]
[null,"Total","$",34925,null,null,"$",36858]
[]
[]
[]
[]
[]
[null,null,"December 31,"]
[null,"Other liabilities, noncurrent",2014,null,null,null,2013]
[null,"Pension and retirement plans","$",16311,null,null,"$",7760]
[]
[null,"Deferred income taxes","—",null,null,null,2564]
[]
[null,"Other",2657,null,null,null,1956]
[]
[null,"Total","$",18968,null,null,"$",12280]

{"sheet":"Supplemental_Operating_Informa","index":13,"n_rows":15,"n_cols":13,"rows_kept":15,"cut":false,"hidden":false,"merged":[[14,1,14,12],[3,1,3,12],[4,1,4,12],[5,1,5,12],[6,1,6,12],[7,1,7,12],[13,1,13,12],[8,1,8,12],[10,2,10,12],[11,2,11,4],[11,6,11,8],[11,10,11,12],[0,0,1,0],[0,1,0,12],[1,1,1,12],[2,1,2,12],[3,0,14,0]]}
["Supplemental Operating Information","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Other Nonoperating Income (Expense) [Abstract]"]
["LItigation Settlement and Supplemental Operating Information","Supplemental Operating Information"]
[]
[null,"Other Nonoperating Income (Expense), Net"]
[]
[null,"Other nonoperating (expense) income, net, included in the statements of operations follows:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Other nonoperating expense, net","$","(3,050",")",null,"$","(2,827",")",null,"$","(2,611",")"]
[]
[null,"Other nonoperating (expense) income, net, includes foreign currency (i) losses of $235 for 2014, (ii) losses of $146 for 2013, and (iii) gains of $11 for 2012 on the intercompany balances of our Canadian operations."]

{"sheet":"Supplemental_Cash_Flow_Informa","index":14,"n_rows":38,"n_cols":13,"rows_kept":38,"cut":false,"hidden":false,"merged":[[0,0,1,0],[0,1,0,12],[1,1,1,12],[2,1,2,12],[3,0,38,0],[3,1,3,12],[4,1,4,12],[5,1,5,12],[37,7,38,7],[37,8,38,8],[37,9,38,9],[37,10,38,10],[37,11,38,11],[37,12,38,12],[37,1,38,1],[37,2,38,2],[37,3,38,3],[37,4,38,4],[37,5,38,5],[37,6,38,6],[34,9,35,9],[34,10,35,11],[34,12,35,12],[36,2,36,3],[36,6,36,7],[36,10,36,11],[34,1,35,1],[34,2,35,3],[34,4,35,4],[34,5,35,5],[34,6,35,7],[34,8,35,8],[30,12,31,12],[32,1,33,1],[32,2,33,3],[32,4,33,4],[32,5,33,5],[32,6,33,7],[32,8,33,8],[32,9,33,9],[32,10,33,11],[32,12,33,12],[28,10,29,11],[28,12,29,12],[30,1,31,1],[30,2,31,3],[30,4,31,4],[30,5,31,5],[30,6,31,7],[30,8,31,8],[30,9,31,9],[30,10,31,11],[26,9,27,9],[26,10,27,11],[26,12,27,12],[28,1,29,1],[28,2,29,3],[28,4,29,4],[28,5,29,5],[28,6,29,7],[28,8,29,8],[28,9,29,9],[24,8,25,8],[24,9,25,9],[24,10,25,11],[24,12,25,12],[26,1,27,1],[26,2,27,3],[26,4,27,4],[26,5,27,5],[26,6,27,7],[26,8,27,8],[22,8,23,8],[22,9,23,9],[22,10,23,10],[22,11,23,11],[22,12,23,12],[24,1,25,1],[24,2,25,3],[24,4,25,4],[24,5,25,5],[24,6,25,7],[20,9,21,9],[20,10,21,11],[20,12,21,12],[22,1,23,1],[22,2,23,2],[22,3,23,3],[22,4,23,4],[22,5,23,5],[22,6,23,6],[22,7,23,7],[18,8,19,8],[18,9,19,9],[18,10,19,11],[18,12,19,12],[20,1,21,1],[20,2,21,3],[20,4,21,4],[20,5,21,5],[20,6,21,7],[20,8,21,8],[16,8,17,8],[16,9,17,9],[16,10,17,10],[16,11,17,11],[16,12,17,12],[18,1,19,1],[18,2,19,3],[18,4,19,4],[18,5,19,5],[18,6,19,7],[14,9,15,9],[14,10,15,11],[14,12,15,12],[16,1,17,1],[16,2,17,2],[16,3,17,3],[16,4,17,4],[16,5,17,5],[16,6,17,6],[16,7,17,7],[14,1,15,1],[14,2,15,3],[14,4,15,4],[14,5,15,5],[14,6,15,7],[14,8,15,8],[10,12,11,12],[12,1,13,1],[12,2,13,3],[12,4,13,4],[12,5,13,5],[12,6,13,7],[12,8,13,8],[12,9,13,9],[12,10,13,11],[12,12,13,12],[10,6,11,6],[10,7,11,7],[10,8,11,8],[10,9,11,9],[10,10,11,10],[10,11,11,11],[6,1,6,12],[8,2,8,12],[9,2,9,4],[9,6,9,8],[9,10,9,12],[10,1,11,1],[10,2,11,2],[10,3,11,3],[10,4,11,4],[10,5,11,5]]}
["Supplemental Cash Flow Information","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Supplemental Cash Flow Information [Abstract]"]
["Supplemental Cash Flow Information","Supplemental Cash Flow Information"]
[]
[null,"Supplemental cash flow information follows: "]
[]
[]
[null,null,"Year Ended December 31,"]
[null,"Supplemental cash flow information",2014,null,null,null,2013,null,null,null,2012]
[null,"Interest paid","$",2948,null,null,"$",2732,null,null,"$",2683]
[]
[null,"Income taxes paid, net",13577,null,null,null,20133,null,null,null,11131]
[]
[null,"Noncash transactions:"]
[]
[null,"Debt issued for purchases of businesses","$",2080,null,null,"$",30,null,null,"$",100]
[]
[null,"Detail of acquisitions:"]
[]
[null,"Assets acquired:"]
[]
[null,"Receivables","$",1852,null,null,"$","—",null,null,"$",474]
[]
[null,"Operating supplies",61,null,null,null,"—",null,null,null,209]
[]
[null,"Prepaid expense",213,null,null,null,"—",null,null,null,47]
[]
[null,"Equipment",1726,null,null,null,"—",null,null,null,1826]
[]
[null,"Deposits and other",558,null,null,null,"—",null,null,null,"—"]
[]
[null,"Intangibles",8443,null,null,null,110,null,null,null,3812]
[]
[null,"Liabilities assumed","(1,078",null,")",null,"—",null,null,null,"(1,868",null,")"]
[]
[null,"Debt issued for purchases of businesses","(2,080",null,")",null,"(30",null,")",null,"(100",null,")"]
[null,"Cash paid","$",9695,null,null,"$",80,null,null,"$",4400]

{"sheet":"Identified_Intangible_Assets_a","index":15,"n_rows":61,"n_cols":19,"rows_kept":61,"cut":false,"hidden":false,"merged":[[4,1,4,19],[5,1,5,19],[30,1,30,19],[33,1,33,19],[34,1,34,19],[46,1,46,19],[60,1,61,1],[60,2,61,2],[60,3,61,4],[60,5,61,5],[0,0,1,0],[0,1,0,19],[1,1,1,19],[2,1,2,19],[3,0,61,0],[3,1,3,19],[56,1,57,1],[56,2,57,2],[56,3,57,4],[56,5,57,5],[58,1,59,1],[58,2,59,2],[58,3,59,4],[58,5,59,5],[52,1,53,1],[52,2,53,2],[52,3,53,3],[52,4,53,4],[52,5,53,5],[54,1,55,1],[54,2,55,2],[54,3,55,4],[54,5,55,5],[44,13,45,13],[44,14,45,14],[44,15,45,15],[44,16,45,16],[48,1,48,5],[50,1,51,1],[50,2,51,2],[50,3,50,5],[51,3,51,5],[47,1,47,19],[44,7,45,7],[44,8,45,8],[44,9,45,9],[44,10,45,10],[44,11,45,11],[44,12,45,12],[44,1,45,1],[44,2,45,2],[44,3,45,3],[44,4,45,4],[44,5,45,5],[44,6,45,6],[42,9,43,9],[42,10,43,11],[42,12,43,12],[42,13,43,13],[42,14,43,15],[42,16,43,16],[40,13,41,13],[40,14,41,14],[40,15,41,15],[40,16,41,16],[42,1,43,1],[42,2,43,3],[42,4,43,4],[42,5,43,5],[42,6,43,7],[42,8,43,8],[40,7,41,7],[40,8,41,8],[40,9,41,9],[40,10,41,10],[40,11,41,11],[40,12,41,12],[40,1,41,1],[40,2,41,2],[40,3,41,3],[40,4,41,4],[40,5,41,5],[40,6,41,6],[37,9,39,9],[37,10,37,12],[38,10,38,12],[39,10,39,12],[37,13,39,13],[37,14,37,16],[38,14,38,16],[39,14,39,16],[37,1,39,1],[37,2,37,4],[38,2,38,4],[39,2,39,4],[37,5,39,5],[37,6,39,8],[28,14,29,14],[28,15,29,15],[28,16,29,16],[28,17,29,18],[28,19,29,19],[35,1,35,16],[28,7,29,7],[28,8,29,8],[28,9,29,10],[28,11,29,11],[28,12,29,12],[28,13,29,13],[28,1,29,1],[28,2,29,2],[28,3,29,3],[28,4,29,4],[28,5,29,5],[28,6,29,6],[26,12,27,12],[26,13,27,14],[26,15,27,15],[26,16,27,16],[26,17,27,18],[26,19,27,19],[24,19,25,19],[26,1,27,1],[26,2,27,2],[26,3,27,3],[26,4,27,4],[26,5,27,6],[26,7,27,7],[26,8,27,8],[26,9,27,10],[26,11,27,11],[24,11,25,11],[24,12,25,12],[24,13,25,14],[24,15,25,15],[24,16,25,16],[24,17,25,18],[22,17,23,18],[22,19,23,19],[24,1,25,1],[24,2,25,2],[24,3,25,3],[24,4,25,4],[24,5,25,6],[24,7,25,7],[24,8,25,8],[24,9,25,10],[22,9,23,10],[22,11,23,11],[22,12,23,12],[22,13,23,14],[22,15,23,15],[22,16,23,16],[20,16,21,16],[20,17,21,18],[20,19,21,19],[22,1,23,1],[22,2,23,2],[22,3,23,3],[22,4,23,4],[22,5,23,6],[22,7,23,7],[22,8,23,8],[20,8,21,8],[20,9,21,10],[20,11,21,11],[20,12,21,12],[20,13,21,14],[20,15,21,15],[18,16,19,16],[18,17,19,17],[18,18,19,18],[18,19,19,19],[20,1,21,1],[20,2,21,2],[20,3,21,3],[20,4,21,4],[20,5,21,6],[20,7,21,7],[18,9,19,9],[18,10,19,10],[18,11,19,11],[18,12,19,12],[18,13,19,14],[18,15,19,15],[16,16,17,16],[16,17,17,18],[16,19,17,19],[18,1,19,1],[18,2,19,2],[18,3,19,3],[18,4,19,4],[18,5,19,6],[18,7,19,7],[18,8,19,8],[16,8,17,8],[16,9,17,10],[16,11,17,11],[16,12,17,12],[16,13,17,14],[16,15,17,15],[16,1,17,1],[16,2,17,2],[16,3,17,3],[16,4,17,4],[16,5,17,6],[16,7,17,7],[14,12,15,12],[14,13,15,14],[14,15,15,15],[14,16,15,16],[14,17,15,18],[14,19,15,19],[12,19,13,19],[14,1,15,1],[14,2,15,2],[14,3,15,3],[14,4,15,4],[14,5,15,6],[14,7,15,7],[14,8,15,8],[14,9,15,10],[14,11,15,11],[12,13,13,13],[12,14,13,14],[12,15,13,15],[12,16,13,16],[12,17,13,17],[12,18,13,18],[12,7,13,7],[12,8,13,8],[12,9,13,9],[12,10,13,10],[12,11,13,11],[12,12,13,12],[12,1,13,1],[12,2,13,2],[12,3,13,3],[12,4,13,4],[12,5,13,5],[12,6,13,6],[9,16,10,16],[9,17,9,19],[10,17,10,19],[11,5,11,7],[11,9,11,11],[11,13,11,15],[11,17,11,19],[9,8,10,8],[9,9,9,11],[10,9,10,11],[9,12,10,12],[9,13,9,15],[10,13,10,15],[6,1,6,19],[8,2,8,3],[9,2,9,3],[10,2,10,3],[8,5,8,11],[8,13,8,19],[9,1,10,1],[9,4,10,4],[9,5,9,7],[10,5,10,7]]}
["Identified Intangible Assets and Goodwill, Net","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Goodwill and Intangible Assets Disclosure [Abstract]"]
["Identified Intangible Assets and Goodwill, Net [Text Block]","Identified Intangible Assets and Goodwill, Net"]
[]
[null,"The carrying amount of the identified intangibles and goodwill acquired in connection with our investments in businesses were as follows:"]
[]
[]
[null,null," Weighted-Average Amortization",null,null,"December 31, 2014",{"$nulls":7},"December 31, 2013"]
[null,null,"Period (Years)",null,null,"Carrying",null,null,null,"Accumulated",null,null,null,"Carrying",null,null,null,"Accumulated"]
[{"$nulls":5},"Amount",null,null,null,"Amortization",null,null,null,"Amount",null,null,null,"Amortization"]
[null,"Amortized intangible assets:"]
[null,"Customer lists/relationships",2.5,"years",null,"$",16076,null,null,"$",12560,null,null,"$",14429,null,null,"$",11398]
[]
[null,"Employment-related",2.8,"years",null,7026,null,null,null,5776,null,null,null,5631,null,null,null,5474]
[]
[null,"Tradenames",3.3,"years",null,5286,null,null,null,4153,null,null,null,4525,null,null,null,3754]
[]
[null,"Total",null,null,null,28388,null,null,null,"$",22489,null,null,24585,null,null,null,"$",20626]
[]
[null,"Less accumulated amortization",null,null,null,22489,{"$nulls":7},20626]
[]
[null,"Identified intangibles, net",null,null,null,5899,{"$nulls":7},3959]
[]
[null,"Unamortized intangible assets:"]
[]
[null,"Goodwill","Not amortized",null,null,28164,{"$nulls":7},23602]
[]
[{"$nulls":5},"$",34063,{"$nulls":6},"$",27561]
[]
[]
[]
[null,"H.","Identified Intangible Assets and Goodwill, Net (continued)"]
[]
[null,"The changes in the carrying amounts of goodwill, by segment, for the year ended December 31, 2014 follow:"]
[]
[]
[null,null,"Balance at",null,null,null,"Acquisitions",null,null,null,"Translation",null,null,null,"Balance at"]
[null,null,"January 1,",{"$nulls":7},"and Other",null,null,null,"December 31,"]
[null,null,2014,{"$nulls":7},"Adjustments",null,null,null,2014]
[null,"Utility","$",3064,null,null,"$",360,null,null,"$","—",null,null,"$",3424]
[]
[null,"Residential and Commercial",20538,null,null,null,4264,null,null,null,"(62",null,")",null,24740]
[]
[null,"Total","$",23602,null,null,"$",4624,null,null,"$","(62",")",null,"$",28164]
[]
[]
[null,"Estimated future aggregate amortization expense of intangible assets--The estimated aggregate amortization expense of intangible assets, as of December 31, 2014, in each of the next five years follows:"]
[]
[]
[null,null,null,"Estimated Future"]
[null,null,null,"Amortization Expense"]
[null,"Year ending December 31, 2015",null,"$",1876]
[]
[null,2016,null,1670]
[]
[null,2017,null,1210]
[]
[null,2018,null,473]
[]
[null,2019,null,338]

{"sheet":"ShortTerm_and_LongTerm_Debt","index":16,"n_rows":52,"n_cols":8,"rows_kept":52,"cut":false,"hidden":false,"merged":[[49,1,49,8],[50,1,50,8],[51,1,51,8],[43,1,43,8],[44,1,44,8],[45,1,45,8],[46,1,46,8],[47,1,47,8],[48,1,48,8],[35,1,35,8],[36,1,36,8],[37,1,37,8],[40,1,40,8],[41,1,41,8],[42,1,42,8],[33,7,34,7],[33,8,34,8],[0,0,1,0],[0,1,0,8],[1,1,1,8],[2,1,2,8],[3,0,51,0],[3,1,3,8],[4,1,4,8],[5,1,5,8],[33,1,34,1],[33,2,34,2],[33,3,34,3],[33,4,34,4],[33,5,34,5],[33,6,34,6],[31,1,32,1],[31,2,32,3],[31,4,32,4],[31,5,32,5],[31,6,32,7],[31,8,32,8],[29,1,30,1],[29,2,30,3],[29,4,30,4],[29,5,30,5],[29,6,30,7],[29,8,30,8],[27,1,28,1],[27,2,28,3],[27,4,28,4],[27,5,28,5],[27,6,28,7],[27,8,28,8],[25,1,26,1],[25,2,26,3],[25,4,26,4],[25,5,26,5],[25,6,26,7],[25,8,26,8],[23,1,24,1],[23,2,24,3],[23,4,24,4],[23,5,24,5],[23,6,24,7],[23,8,24,8],[21,1,22,1],[21,2,22,3],[21,4,22,4],[21,5,22,5],[21,6,22,7],[21,8,22,8],[18,2,18,4],[18,6,18,8],[19,1,20,1],[19,2,20,2],[19,3,20,3],[19,4,20,4],[19,5,20,5],[19,6,20,6],[19,7,20,7],[19,8,20,8],[10,7,11,7],[10,8,11,8],[14,1,14,8],[16,2,16,8],[17,2,17,4],[17,6,17,8],[12,1,12,8],[13,1,13,8],[6,1,6,8],[8,2,8,8],[9,2,9,4],[9,6,9,8],[10,1,11,1],[10,2,11,2],[10,3,11,3],[10,4,11,4],[10,5,11,5],[10,6,11,6]]}
["Short-Term and Long-Term Debt","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Debt Disclosure [Abstract]"]
["Short-Term and Long-Term Debt [Text Block]","Short-Term and Long-Term Debt"]
[]
[null,"Short-term debt consisted of the following:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Current portion of long-term debt","$",8281,null,null,"$",8434]
[]
[]
[null,"At December 31, 2014, we also had unused short-term lines of credit with several banks totaling $7,281, generally at the banks' prime rate or LIBOR plus a margin adjustment of .75% to 1.50%. Long-term debt consisted of the following:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Revolving credit facility"]
[null,"Swing-line borrowings","$",7500,null,null,"$","—"]
[]
[null,"LIBOR borrowings",37000,null,null,null,20000]
[]
[null,null,44500,null,null,null,20000]
[]
[null,"Senior unsecured notes",30000,null,null,null,30000]
[]
[null,"Term loans",15087,null,null,null,8468]
[]
[null,null,89587,null,null,null,58468]
[]
[null,"Less current portion",8281,null,null,null,8434]
[]
[null,null,"$",81306,null,null,"$",50034]
[]
[]
[null,"Revolving Credit Facility and 5.09% Senior Unsecured Notes--In November 2013, the Company amended its revolving credit facility. The amended and restated credit agreement, which expires in November 2018, permits borrowings as defined up to $175,000 including a letter of credit sublimit of $100,000 and a swing-line commitment of $15,000 (the previous "]
[]
[]
[null,"I.","Short-Term and Long-Term Debt (continued)"]
[]
[null,"agreement permitted borrowings up to $140,000 with a letter of credit sublimit of $100,000). Under certain circumstances, the amount available under the revolving credit facility may be increased to $210,000. The revolving credit facility contains certain affirmative and negative covenants customary for this type of facility and includes financial covenant ratios with respect to a maximum leverage ratio and a maximum balance sheet leverage ratio."]
[]
[null,"On July 22, 2010, we issued $30,000 of 5.09% Senior Unsecured Notes, Series A, due July 22, 2020 (the \"5.09% Senior Notes\"). The 5.09% Senior Notes were issued pursuant to a Master Note Purchase Agreement (the “Purchase Agreement”), between the Company and the purchasers of the 5.09% Senior Notes. The net proceeds of the 5.09% Senior Notes were used to pay down borrowings under our revolving credit facility."]
[]
[null,"The 5.09% Senior Notes are equal in right of payment with our revolving credit facility and all other senior unsecured obligations of the Company. Interest is payable semiannually and five equal, annual principal payments commence on July 22, 2016 (the sixth anniversary of issuance).  The Purchase Agreement contains customary events of default and covenants related to limitations on indebtedness and transactions with affiliates and the maintenance of certain financial ratios."]
[]
[null,"As of December 31, 2014, we had unused commitments under the facility approximating $70,964, and $104,036 committed, which consisted of borrowings of $44,500 and issued letters of credit of $59,536. Borrowings outstanding bear interest, at Davey Tree’s option, of either (a) the base rate or (b) LIBOR plus a margin adjustment ranging from .75% to 1.50%--with the margin adjustments in both instances based on the Company's leverage ratio at the time of borrowing. The base rate is the greater of (i) the agent bank’s prime rate, (ii) LIBOR plus 1.5%, or (iii) the federal funds rate plus .5%. A commitment fee ranging from .10% to .25% is also required based on the average daily unborrowed commitment."]
[]
[null,"Term Loans, Weighted-Average Interest Rate--The weighted-average interest on the term loans approximated 3.03% at December 31, 2014 and 2.04% at December 31, 2013."]
[]
[null,"Aggregate Maturities of Long-Term Debt--Aggregate maturities of long-term debt for the five years subsequent to December 31, 2014 were as follows: 2015--$8,281; 2016--$7,234; 2017--$6,803; 2018--$6,150; and, 2019--$6,159."]

{"sheet":"SelfInsurance_Accruals","index":17,"n_rows":44,"n_cols":9,"rows_kept":44,"cut":false,"hidden":false,"merged":[[4,1,4,8],[5,1,5,8],[26,1,26,8],[29,1,29,8],[30,1,30,8],[41,7,42,7],[41,8,42,8],[43,2,43,3],[43,6,43,7],[0,0,1,0],[0,1,0,8],[1,1,1,8],[2,1,2,8],[3,0,43,0],[3,1,3,8],[41,1,42,1],[41,2,42,2],[41,3,42,3],[41,4,42,4],[41,5,42,5],[41,6,42,6],[39,1,40,1],[39,2,40,3],[39,4,40,4],[39,5,40,5],[39,6,40,7],[39,8,40,8],[35,7,36,7],[35,8,36,8],[37,1,38,1],[37,2,38,3],[37,4,38,4],[37,5,38,5],[37,6,38,7],[37,8,38,8],[35,1,36,1],[35,2,36,2],[35,3,36,3],[35,4,36,4],[35,5,36,5],[35,6,36,6],[24,7,25,7],[24,8,25,8],[31,1,31,8],[33,2,33,8],[34,2,34,4],[34,6,34,8],[24,1,25,1],[24,2,25,2],[24,3,25,3],[24,4,25,4],[24,5,25,5],[24,6,25,6],[22,1,23,1],[22,2,23,3],[22,4,23,4],[22,5,23,5],[22,6,23,7],[22,8,23,8],[20,1,21,1],[20,2,21,3],[20,4,21,4],[20,5,21,5],[20,6,21,7],[20,8,21,8],[18,1,19,1],[18,2,19,3],[18,4,19,4],[18,5,19,5],[18,6,19,7],[18,8,19,8],[16,1,17,1],[16,2,17,3],[16,4,17,4],[16,5,17,5],[16,6,17,7],[16,8,17,8],[14,1,15,1],[14,2,15,3],[14,4,15,4],[14,5,15,5],[14,6,15,7],[14,8,15,8],[10,7,11,7],[10,8,11,8],[12,1,13,1],[12,2,13,3],[12,4,13,4],[12,5,13,5],[12,6,13,7],[12,8,13,8],[6,1,6,8],[8,2,8,8],[9,2,9,4],[9,6,9,8],[10,1,11,1],[10,2,11,2],[10,3,11,3],[10,4,11,4],[10,5,11,5],[10,6,11,6]]}
["Self-Insurance Accruals","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Self-Insurance Accruals [Abstract]"]
["Self-Insurance Accruals [Text Block]","Self-Insurance Accruals"]
[]
[null,"Components of our self-insurance accruals for workers’ compensation, vehicle liability and general liability follow:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Workers' compensation","$",32982,null,null,"$",35199]
[]
[null,"Present value discount",1658,null,null,null,1796]
[]
[null,null,31324,null,null,null,33403]
[]
[null,"Vehicle liability",4940,null,null,null,4885]
[]
[null,"General liability",22629,null,null,null,18424]
[]
[null,"Total",58893,null,null,null,56712]
[]
[null,"Less current portion",23007,null,null,null,22057]
[]
[null,"Noncurrent portion","$",35886,null,null,"$",34655]
[]
[]
[]
[null,"J.","Self-Insurance Accruals (continued)"]
[]
[null,"The changes in our self-insurance accruals and the discount rate used for the workers’ compensation accrual are summarized in the table below."]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Balance, beginning of year","$",56712,null,null,"$",61733]
[]
[null,"Provision for claims",30340,null,null,null,27084]
[]
[null,"Payment of claims",28159,null,null,null,32105]
[]
[null,"Balance, end of year","$",58893,null,null,"$",56712]
[]
[null,"Workers' compensation discount rate",2,null,"%",null,2,null,"%"]

{"sheet":"Operating_Lease_Obligations","index":18,"n_rows":27,"n_cols":5,"rows_kept":27,"cut":false,"hidden":false,"merged":[[3,1,3,5],[4,1,4,5],[5,1,5,5],[25,1,25,5],[26,1,26,5],[23,1,24,1],[23,2,24,2],[23,3,24,3],[23,4,24,4],[23,5,24,5],[0,0,1,0],[0,1,0,5],[1,1,1,5],[2,1,2,5],[3,0,26,0],[19,1,20,1],[19,2,20,2],[19,3,20,4],[19,5,20,5],[21,1,22,1],[21,2,22,2],[21,3,22,4],[21,5,22,5],[15,1,16,1],[15,2,16,2],[15,3,16,4],[15,5,16,5],[17,1,18,1],[17,2,18,2],[17,3,18,4],[17,5,18,5],[11,1,12,1],[11,2,12,2],[11,3,12,3],[11,4,12,4],[11,5,12,5],[13,1,14,1],[13,2,14,2],[13,3,14,4],[13,5,14,5],[6,1,6,5],[8,1,9,1],[8,2,9,2],[8,3,8,5],[9,3,9,5],[10,3,10,5]]}
["Operating Lease Obligations","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Leases, Operating [Abstract]"]
["Operating Lease Obligations [Text Block]","Operating Lease Obligations"]
[]
[null,"We lease facilities under noncancelable operating leases, which are used for district office and warehouse operations. These leases extend for varying periods of time up to five years and, in some cases, contain renewal options. Minimum rental commitments under noncancelable operating leases, as of December 31, 2014 were as follows:"]
[]
[]
[null,"Minimum lease obligations",null,"Operating Lease"]
[null,null,null,"Obligations"]
[]
[null,"Year ending December 31, 2015",null,"$",5813]
[]
[null,2016,null,4470]
[]
[null,2017,null,2918]
[]
[null,2018,null,1764]
[]
[null,2019,null,868]
[]
[null,"2020 and after",null,1398]
[]
[null,"Total minimum lease payments",null,"$",17231]
[]
[]
[null,"Total rent expense under all operating leases was $6,554 in 2014, $6,167 in 2013 and $5,860 in 2012."]

{"sheet":"Common_Shares_and_Preferred_Sh","index":19,"n_rows":44,"n_cols":7,"rows_kept":44,"cut":false,"hidden":false,"merged":[[38,1,38,6],[39,1,39,6],[40,1,40,6],[41,1,41,6],[42,1,42,6],[43,1,43,6],[16,1,16,6],[33,1,33,6],[34,1,34,6],[35,1,35,6],[36,1,36,6],[37,1,37,6],[8,1,8,6],[9,1,9,6],[10,1,10,6],[13,1,13,6],[14,1,14,6],[15,1,15,6],[0,0,1,0],[0,1,0,6],[1,1,1,6],[2,1,2,6],[3,0,43,0],[3,1,3,6],[4,1,4,6],[5,1,5,6],[6,1,6,6],[7,1,7,6],[31,1,32,1],[31,2,32,2],[31,3,32,3],[31,4,32,4],[31,5,32,5],[31,6,32,6],[28,1,29,1],[28,2,29,2],[28,3,29,3],[28,4,29,4],[28,5,29,5],[28,6,29,6],[26,1,27,1],[26,2,27,2],[26,3,27,3],[26,4,27,4],[26,5,27,5],[26,6,27,6],[24,1,25,1],[24,2,25,2],[24,3,25,3],[24,4,25,4],[24,5,25,5],[24,6,25,6],[17,1,17,6],[19,2,19,6],[20,2,20,3],[20,5,20,6],[21,1,22,1],[21,2,22,2],[21,3,22,3],[21,4,22,4],[21,5,22,5],[21,6,22,6]]}
["Common Shares and Preferred Shares","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Equity [Abstract]"]
["Common Shares and Preferred Shares [Text Block]","Common Shares and Preferred Shares"]
[]
[null,"Preferred Shares--We have authorized a class of 4,000,000 preferred shares, no par value, of which none were issued."]
[]
[null,"Common Shares--The number of common shares authorized is 24,000,000, par value $1.00. The number of common shares issued during each of the three years in the period ended December 31, 2014 was 21,456,880. The number of shares in the treasury for each of the three years in the period ended December 31, 2014 was as follows: 2014--8,291,947; 2013--$8,018,269; and 2012--$7,730,878."]
[]
[null,"Our common shares are not listed or traded on an established public trading market, and market prices are, therefore, not available. Semiannually, an independent stock valuation firm determines the fair market value of our common shares based upon our performance and financial condition. Since 1979, we have provided a ready market for all shareholders through our direct purchase of their common shares, although we are under no obligation to do so. During 2014, purchases of common shares totaled 727,436 shares for $19,598 in cash; we also had direct sales to directors and employees of 13,061 shares for $346, excluding those shares issued through either the exercise of options or the Employee Stock Purchase Plan. We also sold 53,857 shares to our 401(k) plan for $1,444 and issued 105,589 shares to participant accounts to satisfy our liability for the "]
[]
[]
[null,"L.","Common Shares and Preferred Shares (continued)"]
[]
[null,"2013 employer match in the amount of $2,788. The liability accrued at December 31, 2014 for the 2014 employer match was $2,922. There were also 115,029 shares purchased during 2014 under the Employee Stock Purchase Plan."]
[]
[null,"Common Shares Outstanding--The table below reconciles the activity of the common shares outstanding:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,2013]
[null,"Shares outstanding, beginning of year",13438611,null,null,13726002]
[]
[null,"Shares purchased","(727,436",")",null,"(931,078",")"]
[null,"Shares sold",287536,null,null,299330]
[]
[null,"Stock subscription offering, employee cash purchases",49940,null,null,25837]
[]
[null,"Options exercised",116282,null,null,318520]
[]
[null,null,"(273,678",")",null,"(287,391",")"]
[null,"Shares outstanding, end of year",13164933,null,null,13438611]
[]
[]
[]
[null,"On December 31, 2014, we had 13,164,933 common shares outstanding, employee and director options exercisable to purchase 388,851 common shares, partially-paid subscription for 476,197 common shares and purchase rights outstanding for 195,029 common shares."]
[]
[null,"Stock Subscription Offering--Beginning May 2012, the Company offered to eligible employees and nonemployee directors the right to subscribe to common shares of the Company at $19.70 per share in accordance with the provisions of The Davey Tree Expert Company 2004 Omnibus Stock Plan and the rules of the Compensation Committee of the Company's Board of Directors (collectively, the \"plan\"). The offering period ended on August 1, 2012 and resulted in the subscription of 637,714 common shares for $12,563 at $19.70 per share."]
[]
[null,"Under the plan, a participant in the offering purchasing common shares for an aggregate purchase price of less than $5 had to pay with cash. All participants (excluding Company directors and officers) purchasing $5 or more of the common shares had an option to finance their purchase through a down-payment of at least 10% of the total purchase price and a seven-year promissory note for the balance due with interest at 2%. Payments on the promissory note can be made either by payroll deductions or annual lump-sum payments of both principal and interest."]
[]
[null,"Common shares purchased under the plan have been pledged as security for the payment of the promissory note and the common shares will not be issued until the promissory note is paid-in-full. Dividends will be paid on all subscribed shares, subject to forfeiture to the extent that payment is not ultimately made for the shares."]
[]
[null,"All participants in the offering purchasing in excess of $5 of common shares were granted a \"right\" to purchase one additional common share at a price of $19.70 per share for every three common shares purchased under the plan. As a result of the stock subscription, employees were granted rights to purchase 211,800 common shares. Each right may be exercised at the rate of one-seventh per year and will expire seven years after the date that the right was granted. Employees may not exercise a right should they cease to be employed by the Company."]

{"sheet":"Accumulated_Other_Comprehensiv","index":20,"n_rows":69,"n_cols":18,"rows_kept":69,"cut":false,"hidden":false,"merged":[[6,1,6,17],[9,1,9,17],[10,1,10,17],[67,1,67,17],[68,1,68,17],[65,16,66,16],[65,17,66,17],[0,0,1,0],[0,1,0,17],[1,1,1,17],[2,1,2,17],[3,0,68,0],[3,1,3,17],[4,1,4,17],[5,1,5,17],[65,10,66,10],[65,11,66,11],[65,12,66,12],[65,13,66,13],[65,14,66,14],[65,15,66,15],[63,17,64,17],[65,1,66,1],[65,2,66,2],[65,3,66,3],[65,4,66,4],[65,5,66,5],[65,6,66,6],[65,7,66,7],[65,8,66,8],[65,9,66,9],[63,9,64,9],[63,10,64,10],[63,11,64,12],[63,13,64,13],[63,14,64,14],[63,15,64,16],[61,13,62,13],[61,14,62,14],[61,15,62,16],[61,17,62,17],[63,1,64,1],[63,2,64,2],[63,3,64,4],[63,5,64,5],[63,6,64,6],[63,7,64,8],[59,17,60,17],[61,1,62,1],[61,2,62,2],[61,3,62,4],[61,5,62,5],[61,6,62,6],[61,7,62,8],[61,9,62,9],[61,10,62,10],[61,11,62,12],[59,9,60,9],[59,10,60,10],[59,11,60,12],[59,13,60,13],[59,14,60,14],[59,15,60,16],[57,13,58,13],[57,14,58,14],[57,15,58,16],[57,17,58,17],[59,1,60,1],[59,2,60,2],[59,3,60,4],[59,5,60,5],[59,6,60,6],[59,7,60,8],[55,17,56,17],[57,1,58,1],[57,2,58,2],[57,3,58,4],[57,5,58,5],[57,6,58,6],[57,7,58,8],[57,9,58,9],[57,10,58,10],[57,11,58,12],[55,9,56,9],[55,10,56,10],[55,11,56,12],[55,13,56,13],[55,14,56,14],[55,15,56,16],[53,13,54,13],[53,14,54,14],[53,15,54,16],[53,17,54,17],[55,1,56,1],[55,2,56,2],[55,3,56,4],[55,5,56,5],[55,6,56,6],[55,7,56,8],[51,17,52,17],[53,1,54,1],[53,2,54,2],[53,3,54,4],[53,5,54,5],[53,6,54,6],[53,7,54,8],[53,9,54,9],[53,10,54,10],[53,11,54,12],[51,9,52,9],[51,10,52,10],[51,11,52,12],[51,13,52,13],[51,14,52,14],[51,15,52,16],[51,1,52,1],[51,2,52,2],[51,3,52,4],[51,5,52,5],[51,6,52,6],[51,7,52,8],[49,12,50,12],[49,13,50,13],[49,14,50,14],[49,15,50,15],[49,16,50,16],[49,17,50,17],[49,6,50,6],[49,7,50,7],[49,8,50,8],[49,9,50,9],[49,10,50,10],[49,11,50,11],[47,11,48,12],[47,13,48,13],[47,14,48,14],[47,15,48,16],[47,17,48,17],[49,1,50,1],[49,2,50,2],[49,3,50,3],[49,4,50,4],[49,5,50,5],[45,15,46,16],[45,17,46,17],[47,1,48,1],[47,2,48,2],[47,3,48,4],[47,5,48,5],[47,6,48,6],[47,7,48,8],[47,9,48,9],[47,10,48,10],[45,7,46,8],[45,9,46,9],[45,10,46,10],[45,11,46,12],[45,13,46,13],[45,14,46,14],[43,11,44,12],[43,13,44,13],[43,14,44,14],[43,15,44,16],[43,17,44,17],[45,1,46,1],[45,2,46,2],[45,3,46,4],[45,5,46,5],[45,6,46,6],[41,15,42,16],[41,17,42,17],[43,1,44,1],[43,2,44,2],[43,3,44,4],[43,5,44,5],[43,6,44,6],[43,7,44,8],[43,9,44,9],[43,10,44,10],[41,7,42,8],[41,9,42,9],[41,10,42,10],[41,11,42,12],[41,13,42,13],[41,14,42,14],[39,11,40,12],[39,13,40,13],[39,14,40,14],[39,15,40,16],[39,17,40,17],[41,1,42,1],[41,2,42,2],[41,3,42,4],[41,5,42,5],[41,6,42,6],[37,15,38,16],[37,17,38,17],[39,1,40,1],[39,2,40,2],[39,3,40,4],[39,5,40,5],[39,6,40,6],[39,7,40,8],[39,9,40,9],[39,10,40,10],[37,7,38,8],[37,9,38,9],[37,10,38,10],[37,11,38,12],[37,13,38,13],[37,14,38,14],[35,11,36,12],[35,13,36,13],[35,14,36,14],[35,15,36,16],[35,17,36,17],[37,1,38,1],[37,2,38,2],[37,3,38,4],[37,5,38,5],[37,6,38,6],[33,16,34,16],[33,17,34,17],[35,1,36,1],[35,2,36,2],[35,3,36,4],[35,5,36,5],[35,6,36,6],[35,7,36,8],[35,9,36,9],[35,10,36,10],[33,10,34,10],[33,11,34,11],[33,12,34,12],[33,13,34,13],[33,14,34,14],[33,15,34,15],[31,17,32,17],[33,1,34,1],[33,2,34,2],[33,3,34,3],[33,4,34,4],[33,5,34,5],[33,6,34,6],[33,7,34,7],[33,8,34,8],[33,9,34,9],[31,9,32,9],[31,10,32,10],[31,11,32,12],[31,13,32,13],[31,14,32,14],[31,15,32,16],[29,13,30,13],[29,14,30,14],[29,15,30,16],[29,17,30,17],[31,1,32,1],[31,2,32,2],[31,3,32,4],[31,5,32,5],[31,6,32,6],[31,7,32,8],[27,17,28,17],[29,1,30,1],[29,2,30,2],[29,3,30,4],[29,5,30,5],[29,6,30,6],[29,7,30,8],[29,9,30,9],[29,10,30,10],[29,11,30,12],[27,9,28,9],[27,10,28,10],[27,11,28,12],[27,13,28,13],[27,14,28,14],[27,15,28,16],[25,13,26,13],[25,14,26,14],[25,15,26,16],[25,17,26,17],[27,1,28,1],[27,2,28,2],[27,3,28,4],[27,5,28,5],[27,6,28,6],[27,7,28,8],[23,17,24,17],[25,1,26,1],[25,2,26,2],[25,3,26,4],[25,5,26,5],[25,6,26,6],[25,7,26,8],[25,9,26,9],[25,10,26,10],[25,11,26,12],[23,9,24,9],[23,10,24,10],[23,11,24,12],[23,13,24,13],[23,14,24,14],[23,15,24,16],[21,13,22,13],[21,14,22,14],[21,15,22,16],[21,17,22,17],[23,1,24,1],[23,2,24,2],[23,3,24,4],[23,5,24,5],[23,6,24,6],[23,7,24,8],[19,17,20,17],[21,1,22,1],[21,2,22,2],[21,3,22,4],[21,5,22,5],[21,6,22,6],[21,7,22,8],[21,9,22,9],[21,10,22,10],[21,11,22,12],[19,9,20,9],[19,10,20,10],[19,11,20,12],[19,13,20,13],[19,14,20,14],[19,15,20,16],[19,1,20,1],[19,2,20,2],[19,3,20,4],[19,5,20,5],[19,6,20,6],[19,7,20,8],[17,12,18,12],[17,13,18,13],[17,14,18,14],[17,15,18,15],[17,16,18,16],[17,17,18,17],[17,6,18,6],[17,7,18,7],[17,8,18,8],[17,9,18,9],[17,10,18,10],[17,11,18,11],[13,14,16,14],[13,15,13,17],[14,15,14,17],[15,15,15,17],[16,15,16,17],[17,1,18,1],[17,2,18,2],[17,3,18,3],[17,4,18,4],[17,5,18,5],[15,7,15,9],[16,7,16,9],[13,10,16,10],[13,11,13,13],[14,11,14,13],[15,11,15,13],[16,11,16,13],[11,1,11,17],[13,1,16,1],[13,2,16,2],[13,3,13,5],[14,3,14,5],[15,3,15,5],[16,3,16,5],[13,6,16,6],[13,7,13,9],[14,7,14,9]]}
["Accumulated Other Comprehensive Income (Loss)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Equity [Abstract]"]
["Accumulated Other Comprehensive Income (Loss)","Accumulated Other Comprehensive Income (Loss)"]
[]
[null,"Comprehensive income (loss) is comprised of net income and other adjustments that relate to foreign currency translation adjustments, changes in the fair value of interest rate contracts qualifying as cash flow hedges, and defined benefit pension plan adjustments. We do not provide income taxes on currency translation adjustments, as the earnings of our Canadian operations are considered to be indefinitely reinvested."]
[]
[]
[null,"M.","Accumulated Other Comprehensive Income (Loss) (continued)"]
[]
[null,"The following summarizes the components of other comprehensive income (loss) accumulated in shareholders’ equity:"]
[]
[]
[null,null,null,"Foreign",null,null,null,"Interest",null,null,null,"Defined",null,null,null,"Accumulated"]
[null,null,null,"Currency",null,null,null,"Rate Cash",null,null,null,"Benefit",null,null,null,"Other"]
[null,null,null,"Translation",null,null,null,"Flow Hedges",null,null,null,"Pension",null,null,null,"Comprehensive"]
[null,null,null,"Adjustments",{"$nulls":7},"Plans",null,null,null,"Income/(Loss)"]
[null,"Balance at January 1, 2012",null,"$",2950,null,null,"$","(77",")",null,"$","(9,217",")",null,"$","(6,344",")"]
[]
[null,"Unrealized gains (losses)",null,561,null,null,null,"—",null,null,null,"—",null,null,null,561]
[]
[null,"Unrealized gains in fair value",null,"—",null,null,null,123,null,null,null,"—",null,null,null,123]
[]
[null,"Amounts reclassified from accumulated other comprehensive income (loss)",null,"—",null,null,null,"—",null,null,null,1268,null,null,null,1268]
[]
[null,"Tax effect",null,"—",null,null,null,"—",null,null,null,"(507",null,")",null,"(507",null,")"]
[]
[null,"Unrecognized amounts from defined benefit pension plans",null,"—",null,null,null,"—",null,null,null,"(3,712",null,")",null,"(3,712",null,")"]
[]
[null,"Tax effect",null,"—",null,null,null,"(46",null,")",null,1542,null,null,null,1496]
[]
[null,"Net of tax amount",null,561,null,null,null,77,null,null,null,"(1,409",null,")",null,"(771",null,")"]
[]
[null,"Balance at December 31, 2012",null,"$",3511,null,null,"$","—",null,null,"$","(10,626",")",null,"$","(7,115",")"]
[]
[null,"Unrealized gains (losses)",null,"(1,864",null,")",null,"—",null,null,null,"—",null,null,null,"(1,864",null,")"]
[]
[null,"Unrealized gains in fair value",null,"—",null,null,null,"—",null,null,null,"—",null,null,null,"—"]
[]
[null,"Amounts reclassified from accumulated other comprehensive income (loss)",null,"—",null,null,null,"—",null,null,null,1401,null,null,null,1401]
[]
[null,"Tax effect",null,"—",null,null,null,"—",null,null,null,"(532",null,")",null,"(532",null,")"]
[]
[null,"Unrecognized amounts from defined benefit pension plans",null,"—",null,null,null,"—",null,null,null,6306,null,null,null,6306]
[]
[null,"Tax effect",null,"—",null,null,null,"—",null,null,null,"(2,589",null,")",null,"(2,589",null,")"]
[]
[null,"Net of tax amount",null,"(1,864",null,")",null,"—",null,null,null,4586,null,null,null,2722]
[]
[null,"Balance at December 31, 2013",null,"$",1647,null,null,"$","—",null,null,"$","(6,040",")",null,"$","(4,393",")"]
[]
[null,"Unrealized gains (losses)",null,"(2,798",null,")",null,"—",null,null,null,"—",null,null,null,"(2,798",null,")"]
[]
[null,"Unrealized gains in fair value",null,"—",null,null,null,"—",null,null,null,"—",null,null,null,"—"]
[]
[null,"Amounts reclassified from accumulated other comprehensive income (loss)",null,"—",null,null,null,"—",null,null,null,2786,null,null,null,2786]
[]
[null,"Tax effect",null,"—",null,null,null,"—",null,null,null,"(1,095",null,")",null,"(1,095",null,")"]
[]
[null,"Unrecognized amounts from defined benefit pension plans",null,"—",null,null,null,"—",null,null,null,"(9,923",null,")",null,"(9,923",null,")"]
[]
[null,"Tax effect",null,"—",null,null,null,"—",null,null,null,3900,null,null,null,3900]
[]
[null,"Net of tax amount",null,"(2,798",null,")",null,"—",null,null,null,"(4,332",null,")",null,"(7,130",null,")"]
[]
[null,"Balance at December 31, 2014",null,"$","(1,151",")",null,"$","—",null,null,"$","(10,372",")",null,"$","(11,523",")"]
[]
[]
[null,"The amounts reclassified from accumulated other comprehensive income (loss) related to defined benefit pension plans for 2014, 2013 and 2012 are included in net periodic pension expense and classified in the statement of operations as costs and expenses, general and administrative."]

{"sheet":"The_Davey_401KSOP_and_Employee","index":21,"n_rows":14,"n_cols":3,"rows_kept":14,"cut":false,"hidden":false,"merged":[[10,1,10,2],[11,1,11,2],[12,1,12,2],[13,1,13,2],[0,0,1,0],[0,1,0,2],[1,1,1,2],[2,1,2,2],[3,0,13,0],[3,1,3,2],[4,1,4,2],[5,1,5,2],[6,1,6,2],[7,1,7,2]]}
["The Davey 401KSOP and Employee Stock Ownership Plan","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Compensation and Retirement Disclosure [Abstract]"]
["The Davey 401KSOP and Employee Stock Ownership Plan","The Davey 401KSOP and Employee Stock Ownership Plan"]
[]
[null,"On March 15, 1979, we consummated a plan, which transferred control of the Company to our employees. As a part of this plan, we initially sold 120,000 common shares (presently, 11,520,000 common shares adjusted for stock splits) to our Employee Stock Ownership Trust (“ESOT”) for $2,700. The Employee Stock Ownership Plan (“ESOP”), in conjunction with the related ESOT, provided for the grant to certain employees of certain ownership rights in, but not possession of, the common shares held by the trustee of the ESOT. Annual allocations of shares have been made to individual accounts established for the benefit of the participants."]
[]
[]
[]
[null,"N.","The Davey 401KSOP and Employee Stock Ownership Plan (continued)"]
[]
[null,"Defined Contribution and Savings Plans--Most employees are eligible to participate in The Davey 401KSOP and ESOP. Effective January 1, 1997, the plan commenced operations and retained the existing ESOP participant accounts and incorporated a deferred savings plan (a \"401(k) plan\") feature. Participants in the 401(k) plan are allowed to make before-tax contributions, within Internal Revenue Service established limits, through payroll deductions. Effective January 1, 2009 we match, in either cash or our common shares, 100% of the first one percent and 50% of the next three percent of each participant's before-tax contribution, limited to the first four percent of the employee's compensation deferred each year. All nonbargaining domestic employees who attained age 21 and completed one year of service are eligible to participate. In May 2004, we adopted the 401K Match Restoration Plan, a defined contribution plan that supplements the retirement benefits of certain employees that participate in the savings plan feature of The Davey 401KSOP and ESOP Plan, but are limited in contributions because of tax rules and regulations."]
[]
[null,"Total compensation for these plans, consisting primarily of the employer match, was $2,922 in 2014, $2,788 in 2013, and $2,643 in 2012."]

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["Stock-Based Compensation","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Disclosure of Compensation Related Costs, Share-based Payments [Abstract]"]
["Stock-Based Compensation","Stock-Based Compensation "]
[]
[null,"Our shareholders approved the 2014 Omnibus Stock Plan (the “2014 Stock Plan”) at our annual meeting of shareholders on May 20, 2014. The 2014 Stock Plan replaced the expired 2004 Omnibus Stock Plan (the “2004 plan”) previously approved by the shareholders in 2004. The 2014 Stock Plan is administered by the Compensation Committee of the Board of Directors and will remain in effect for ten years. All directors of the Company and employees of the Company and its subsidiaries are eligible to participate in the 2014 Stock Plan. The 2014 Stock Plan (similar to the 2004 plan) continues the maintenance of the Employee Stock Purchase Plan, as well as provisions for the grant of stock options and other stock-based incentives. The 2014 Stock Plan provides for the grant of five percent of the number of the Company’s common shares outstanding as of the first day of each fiscal year plus the number of common shares that were available for grant of awards, but not granted, in prior years. In no event, however, may the number of common shares available for the grant of awards in any fiscal year exceed ten percent of the common shares outstanding as of the first day of that fiscal year. Common shares subject to an award that is forfeited, terminated, or canceled without having been exercised are generally added back to the number of shares available for grant under the 2014 Stock Plan."]
[]
[null,"Stock-based compensation expense under all share-based payment plans—our Employee Stock Purchase Plan, stock option plans, stock-settled stock appreciation rights, and performance-based restricted stock units—included in the results of operations follows:"]
[]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Compensation expense, all share-based payment plans","$",1860,null,null,"$",1411,null,null,"$",1508]
[]
[null,"Income tax benefit",549,null,null,null,348,null,null,null,383]
[]
[]
[null,"Stock-based compensation consisted of the following:"]
{"$rows_empty":12}
[null,"O.  ","Stock-Based Compensation (continued)"]
[]
[null,"Employee Stock Purchase Plan--Under the Employee Stock Purchase Plan, all full-time employees with one year of service are eligible to purchase, through payroll deduction, common shares. Employee purchases under the Employee Stock Purchase Plan are at 85% of the fair market value of the common shares--a 15% discount. Purchases under the plan, at 85% of the fair market value of the common shares, have been as follows:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Number of employees participating",1684,null,null,null,1500,null,null,null,1157]
[]
[null,"Shares purchased during the year",115029,null,null,null,118444,null,null,null,136947]
[]
[null,"Weighted-average per share purchase price paid","$",23.07,null,null,"$",20.010000000000002,null,null,"$",17.2]
[]
[null,"Cumulative shares purchased since 1982",8751255,null,null,null,8636226,null,null,null,8517782]
[]
[]
[null,"Compensation costs are recognized as payroll deductions are made. The 15% discount of total shares purchased under the plan resulted in compensation cost recognized of $463 in 2014, $417 in 2013 and $415 in 2012."]
[]
[null,"Stock Option Plans-The stock options outstanding were awarded under a graded vesting schedule, measured at fair value, and have a term of ten years. Compensation costs for stock options are recognized over the requisite service period on the straight-line recognition method. Compensation cost recognized for stock options was $398 in 2014, $234 in 2013 and $166 in 2012."]
[]
[null,"Stock-Settled Stock Appreciation Rights--During the year ended December 31, 2014, the Compensation Committee of the Board of Directors awarded 127,050 Stock-Settled Stock Appreciation Rights (“SSARs”) to certain management employees and nonemployee directors, which vest ratably over five years. A stock-settled stock appreciation right is an award that allows the recipient to receive common stock equal to the appreciation in the fair market value of our common stock between the date the award was granted and the conversion date of the shares vested."]
[]
[]
[null,"The following table summarizes the SSARs as of December 31, 2014: "]
[]
[]
[null,"Stock-Settled",null,"Number of",null,null,"Weighted-",null,null,null,"Weighted-",null,"Unrecognized",null,null,null,"Aggregate"]
[null,"Stock Appreciation Rights",null,"Rights",null,null,"Average Award Date Value",null,null,null,"Average",null,"Compensation Cost",null,null,null,"Intrinsic Value"]
[{"$nulls":10},"Remaining Contractual Life"]
[null,"Unvested, January 1, 2014",null,283453,null,null,"$",3.15]
[]
[null,"Granted",null,127050,null,null,4.88]
[]
[null,"Forfeited",null,"—",null,null,"—"]
[]
[null,"Vested",null,"(107,232",")",null,3.26]
[]
[null,"Unvested, December 31, 2014",null,303271,null,null,"$",3.84,null,null,"2.0 years",null,"$",865,null,null,"$",8431]
[]
[null,"Employee SSARs",null,286294,null,null,"$",3.92,null,null,"2.0 years",null,"$",838,null,null,"$",7959]
[]
[null,"Nonemployee Director SSARs",null,16977,null,null,"$",2.29,null,null,"1.8 years",null,"$",27,null,null,"$",472]
[]
[]
[null,"Compensation costs for stock appreciation rights are determined using a fair-value method and amortized over the requisite service period. Compensation expense for stock appreciation rights totaled $384 in 2014, $315 in 2013 and $185 in 2012."]
[]
[]
[]
[]
[]
[null,"O.","Stock-Based Compensation (continued)"]
[]
[null,"Performance-Based Restricted Stock Units--During the year ended December 31, 2014, the Compensation Committee of the Board of Directors awarded 39,476 Performance-Based Restricted Stock Units (\"PRSUs\") to certain management employees. "]
[]
[null,"Similar awards were made in prior periods. The awards vest over specified periods. The following table summarizes "]
[null,"Performance-Based Restricted Stock Units as of December 31, 2014:"]
[]
[]
[null,"Performance-Based",null,"Number of",null,null,"Weighted-",null,null,null,"Weighted-",null,"Unrecognized",null,null,null,"Aggregate"]
[null,"Restricted Stock Units",null,"Stock Units",null,null,"Average",null,null,null,"Average",null,"Compensation",null,null,null,"Intrinsic"]
[{"$nulls":6},"Grant Date Value",null,null,null,"Remaining",null,"Cost",null,null,null,"Value"]
[{"$nulls":10},"Contractual Life"]
[null,"Unvested, January 1, 2014",null,95558,null,null,"$",19.03]
[]
[null,"Granted",null,39476,null,null,24.64]
[]
[null,"Forfeited",null,"—",null,null,"—"]
[]
[null,"Vested",null,"(17,325",")",null,17.48]
[]
[null,"Unvested, December 31, 2014",null,117709,null,null,"$",21.14,null,null,"2.7 years",null,"$",1456,null,null,"$",3272]
[]
[null,"Employee PRSUs",null,103139,null,null,"$",20.78,null,null,"2.9 years",null,"$",1236,null,null,"$",2867]
[]
[null,"Nonemployee Director PRSUs",null,14570,null,null,"$",23.61,null,null,"1.8 years",null,"$",220,null,null,"$",405]
[]
[]
[null,"Compensation cost for awards is determined using a fair-value method, amortized over the requisite service period. “Intrinsic value” is defined as the amount by which the fair market value of a common share of stock exceeds the exercise price of a performance-based restricted stock unit. Compensation expense on restricted stock awards totaled $615 in 2014, $445 in 2013 and $644 in 2012."]
[]
[null,"The fair value of each award was estimated on the date of grant using a binomial option-pricing model. The binomial model considers a range of assumptions related to volatility, risk-free interest rate and employee exercise behavior. Expected volatilities utilized in the binomial model are based on historical volatility of our share prices and other factors. Similarly, the dividend yield is based on historical experience and expected future changes. The binomial model also incorporates exercise and forfeiture assumptions based on an analysis of historical data. The expected life of the stock-based awards is derived from the output of the binomial model and represents the period of time that awards granted are expected to be outstanding."]
[]
[null,"The fair values of stock-based awards granted were estimated at the dates of grant with the following weighted-average assumptions:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,2013,null,null,2012]
[null,"Volatility rate",11.2,"%",null,11.3,"%",null,11.7,"%"]
[null,"Risk-free interest rate",2.6,"%",null,2.1,"%",null,1.6,"%"]
[null,"Expected dividend yield",1.1000000000000001,"%",null,1.5,"%",null,1.5,"%"]
[null,"Expected life of awards (years)",9.4,null,null,9.4,null,null,9.1]
[]
[]
[]
[null,"O.","Stock-Based Compensation (continued)"]
[]
[null,"General Stock Option Information--The following table summarizes activity under the stock option plans for the year ended December 31, 2014:"]
[]
[]
[null,"Stock Options",null,"Number of",null,null,"Weighted-",null,null,null,"Weighted-",null,"Unrecognized",null,null,null,"Aggregate"]
[null,null,null,"Options",null,null,"Average",null,null,null,"Average",null,"Compensation",null,null,null,"Intrinsic"]
[null,null,null,"Outstanding",null,null,"Exercise",null,null,null,"Remaining",null,"Cost",null,null,null,"Value"]
[{"$nulls":6},"Price",null,null,null,"Contractual"]
[{"$nulls":10},"Life"]
[null,"Outstanding, January 1, 2014",null,662246,null,null,"$",16.68]
[]
[null,"Granted",null,183500,null,null,26.4]
[]
[null,"Exercised",null,"(74,715",")",null,13.11]
[]
[null,"Forfeited",null,"(900",")",null,24.98]
[]
[null,"Outstanding, December 31, 2014",null,770131,null,null,"$",19.329999999999998,null,null,"6.3 years",null,"$",1509,null,null,"$",6523]
[]
[null,"Exercisable, December 31, 2014",null,388851,null,null,"$",14.7,null,null,"3.9 years",{"$nulls":5},"$",5094]
[]
[]
[null,"“Intrinsic value” is defined as the amount by which the market price of a common share of stock exceeds the exercise price of an option. Information regarding the stock options outstanding at December 31, 2014 is summarized below:"]
[]
[]
[null,"Stock Options",null,null,"Number",null,null,"Weighted-Average",null,"Weighted-",null,null,null,"Number",null,null,"Weighted-"]
[null," Exercise Price",null,null,"Outstanding",null,null,"Remaining",null,"Average",null,null,null,"Exercisable",null,null,"Average"]
[{"$nulls":7},"Contractual Life",null,"Exercise",{"$nulls":6},"Exercise"]
[{"$nulls":9},"Price",{"$nulls":6},"Price"]
[null,"Employee options:"]
[null,11.25,null,null,170047,null,null,"1.4 years",null,"$",11.25,null,null,170047,null,null,"$",11.25]
[]
[null,16,null,null,113234,null,null,"4.8 years",null,16,null,null,null,113234,null,null,16]
[]
[null,16.600000000000001,null,null,108900,null,null,"5.8 years",null,16.600000000000001,null,null,null,69420,null,null,16.600000000000001]
[]
[null,23.2,null,null,194950,null,null,"8.5 years",null,23.2,null,null,null,36150,null,null,23.2]
[]
[null,26.4,null,null,183000,null,null,"9.5 years",null,26.4,null,null,null,"—",null,null,26.4]
[]
[{"$nulls":4},770131,null,null,"6.3 years",null,"$",19.329999999999998,null,null,388851,null,null,"$",14.7]
[]
[]
[null,"We issue common shares from treasury upon the exercise of stock options, stock-settled stock appreciation rights, performance-based restricted stock units or purchases under the Employee Stock Purchase Plan."]
[]
[null,"Tax Benefits of Stock-Based Compensation--Our total income tax benefit from share-based awards--as recognized in our consolidated statement of operations--for the last three years was: $549 in 2014, $348 in 2013, and $383 in 2012."]
[]
[null,"Tax benefits for share-based awards are accrued as stock compensation expense and recognized in our consolidated statement of operations. Tax benefits on share-based awards are realized when: (a) stock-settled stock appreciation rights are exercised; (b) performance-based restricted stock units vest; and, (c) stock options are exercised."]
[]
[null,"When actual tax benefits realized exceed the tax benefits accrued for share-based awards, we realize an excess tax benefit. We report the excess tax benefit as financing cash inflows rather than operating cash inflows. We had excess tax benefits of: $354 in 2014, $242 in 2013, and $402 in 2012."]

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["Defined Benefit Pension Plans","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Compensation and Retirement Disclosure [Abstract]"]
["Defined Benefit Pension Plans","Defined Benefit Pension Plans "]
[]
[null,"We have defined benefit pension plans covering certain current and retired U.S. employees. Plans include: (i) the Employee Retirement Plan (“ERP”) for employees hired prior to January 1, 2009; (ii) a plan for bargaining employees not covered by union pension plans (the “SPP”) for which future benefit accruals were frozen effective December 31, 2013; (iii) a Supplemental Executive Retirement Plan (“SERP”); and, (iv) a Benefit Restoration Pension Plan (“Restoration Plan”) for certain key employees hired prior to January 1, 2009."]
[]
[null,"Both the SERP and the Restoration Plan are defined benefit plans under which nonqualifed supplemental pension benefits will be paid in addition to amounts paid under our qualified retirement defined benefit pension plans, which are subject to Internal Revenue Service limitations on covered compensation."]
[]
[null,"Effective December 31, 2008, enhanced benefits were implemented to our defined contribution savings plan--The Davey 401KSOP and ESOP--at which time, the Board of Directors approved an amendment to freeze the ERP and the Restoration Plan. The ERP was closed to new participants after December 2008. In connection with the freeze of the ERP and Restoration Plan, (i) benefits currently being paid to retirees continue and (ii) benefits accrued through December 31, 2008 for employees covered by the ERP were not affected. All ERP and Restoration Plan balances remain intact and participant account balances, as well as service credits for vesting and retirement eligibility, remain intact and continue in accordance with the terms of the plans. The 2008 freeze of the ERP and Restoration Plan eliminated future accruals only as did the December 31, 2013 freeze of the SPP."]
[]
[null,"The change in benefit obligations and the fair value of plans assets follows:"]
[]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Change in benefit obligation"]
[null,"Projected benefit obligation at beginning of year","$",31888,null,null,"$",36045]
[]
[null,"Service cost",51,null,null,null,222]
[]
[null,"Interest cost",1618,null,null,null,1515]
[]
[null,"Actuarial (gains)/losses",4838,null,null,null,"(4,272",null,")"]
[]
[null,"New longevity assumptions",3229,null,null,null,"—"]
[]
[null,"Settlements","(4,319",null,")",null,"—"]
[]
[null,"Benefits paid","(1,429",null,")",null,"(1,622",null,")"]
[null,"Projected benefit obligation at end of year","$",35876,null,null,"$",31888]
[]
[null,"Accumulated benefit obligation at end of year","$",35475,null,null,"$",31599]
[]
[]
[]
[]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Change in fair value of plan assets"]
[null,"Fair value of plan assets at beginning of year","$",25754,null,null,"$",22957]
[]
[null,"Actual return on plan assets, net of expenses",136,null,null,null,3793]
[]
[null,"Employer contributions",1425,null,null,null,626]
[]
[null,"Settlements","(4,319",null,")",null,"—"]
[]
[null,"Benefits paid","(1,429",null,")",null,"(1,622",null,")"]
[null,"Fair value of plan assets at end of year","$",21567,null,null,"$",25754]
[]
[]
[]
[]
[null,"P.","Defined Benefit Pension Plans (continued)"]
[]
[null,"The settlements in the change in benefit obligation and in the change in fair value of plan assets, arise from the purchase, during the fourth quarter ended December 31, 2014, of a guaranteed group annuity contract from a third-party insurance company which unconditionally and irrevocably guarantees the full payment of all annuity payments to the participants that were receiving payments from the ERP plan, with the third-party insurance company having assumed all investment risk associated with funding participant payments."]
[]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Funded status of the plans"]
[null,"Fair value of plan assets","$",21567,null,null,"$",25754]
[]
[null,"Projected benefit obligation",35876,null,null,null,31888]
[]
[null,"Funded status of the plans","$","(14,309",")",null,"$","(6,134",")"]
[]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Amounts reported in the consolidated balance sheets"]
[null,"Current liability","$","(38",")",null,"$","(37",")"]
[null,"Noncurrent liability","(14,271",null,")",null,"(6,097",null,")"]
[null,"Funded status of the plans","$","(14,309",")",null,"$","(6,134",")"]
[]
[null,"The change in funded status of the plans and accumulated other comprehensive income (loss) related to our defined benefit pension plans as at December 31, 2014, is primarily a result of lower discount rate and having implemented a new set of mortality and mortality improvement tables. During the fourth quarter ended December 31, 2014, the Society of Actuaries (“SOA”) issued new mortality and mortality improvement tables that reflect longer life expectancies and thereby indicate the amount of estimated aggregate benefit payments to plan participants is increasing. We have incorporated the new SOA tables--new longevity assumptions--into our December 31, 2014 measurement of pension plans’ benefit obligations. "]
[]
[null,"Amounts included in accumulated other comprehensive income (loss), related to our defined benefit pension plans follow:"]
[]
[]
[null,null,"At December 31, 2014",{"$nulls":7},"At December 31, 2013"]
[null,null,"Pretax",null,null,null,"Net of Tax",null,null,null,"Pretax",null,null,null,"Net of Tax"]
[null,"Amounts reported in accumulated other comprehensive income"]
[null,"Unrecognized net actuarial loss","$",17093,null,null,"$",10339,null,null,"$",9942,null,null,"$",5995]
[]
[null,"Unrecognized prior service cost",55,null,null,null,33,null,null,null,69,null,null,null,45]
[]
[null,null,"$",17148,null,null,"$",10372,null,null,"$",10011,null,null,"$",6040]
[]
[]
[null,"To the extent actuarial losses exceed the greater of 10% of the projected benefit obligation or market-related value of plan assets, the unrecognized actuarial losses will be amortized straight-line on a plan-by-plan basis, over the remaining expected future working lifetime of active participants. The total amount of unrecognized prior service cost is also amortized straight-line on a plan-by-plan basis. The total amortization associated with these amounts that is expected to be recognized in net periodic benefit expense for 2015 follows: "]
{"$rows_empty":7}
[null,"P.","Defined Benefit Pension Plans (continued)"]
[]
[]
[null,null,"Year ending December 31, 2015"]
[null,null,"Pretax",null,null,null,"Net of Tax"]
[null,"Amortization of Costs Expected to be Recognized Next Year"]
[null,"Unrecognized net actuarial loss","$",1546,null,null,"$",928]
[]
[null,"Unrecognized prior service cost",14,null,null,null,8]
[]
[null,null,"$",1560,null,null,"$",936]
[]
[]
[null,"The aggregate projected benefit obligation, accumulated benefit obligation and fair value of plan assets for plans in which the fair value of plan assets is less than either the projected benefit obligation or accumulated benefit obligation follow: "]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"For pension plans with accumulated benefit obligations in excess of plan assets"]
[null,"Projected benefit obligation","$",35876,null,null,"$",31888]
[]
[null,"Accumulated benefit obligation",35475,null,null,null,31599]
[]
[null,"Fair value of plan assets",21567,null,null,null,25754]
[]
[]
[null,"The actuarial assumptions follow. The discount rates were used to measure the year-end benefit obligation and compute pension expense for the subsequent year."]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,2013,null,null,2012]
[null,"Actuarial assumptions"]
[null,"Discount rate",4.3,"%",null,5.2,"%",null,4.25,"%"]
[null,"Expected long-term rate of return on plan assets",7.5,null,null,7.75,null,null,7.75]
[]
[]
[null,"Net periodic benefit expense (income) associated with the defined benefit pension plans included the following components:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Components of pension expense (income)"]
[null,"Service costs--increase in benefit obligation earned","$",51,null,null,"$",222,null,null,"$",185]
[]
[null,"Interest cost on projected benefit obligation",1618,null,null,null,1515,null,null,null,1657]
[]
[null,"Expected return on plan assets","(1,993",null,")",null,"(1,760",null,")",null,"(1,701",null,")"]
[null,"Settlement loss",2065,null,null,null,"—",null,null,null,219]
[]
[null,"Amortization of net actuarial loss",708,null,null,null,1388,null,null,null,1041]
[]
[null,"Amortization of prior service cost",14,null,null,null,14,null,null,null,14]
[]
[null,"Net pension expense of defined benefit pension plans","$",2463,null,null,"$",1379,null,null,"$",1415]
[]
[]
[]
[null,"Investment Strategy and Risk Management for Plan Assets--Our investment strategy is to manage the plan assets in order to pay retirement benefits to plan participants while minimizing our cash contributions over the life of the plans. This is accomplished by preserving capital through diversification in high-quality investments through the use of investment "]
[]
[null,"P.  ","Defined Benefit Pension Plans (continued)"]
[]
[null,"managers and mutual funds. Performance of all investment managers and mutual funds is monitored quarterly and evaluated over rolling three-to-five year periods."]
[]
[null,"The plan assets are divided into asset classes that include equity, fixed income, and alternative investments and allocated among target allocations to include: (a) equities of a minimum 55% to a maximum of 65%; (b) fixed income and cash of a minimum 20% to a maximum of 30%; and, (c) alternative investments of a minimum of zero to a maximum of 15%. The purpose of the equity asset class is to provide a total return that simultaneously provides for growth in principal and current income while at the same time preserving the purchasing power of the plan assets, even though assets invested in equities have greater market volatility and risk. The purpose of the fixed income asset class is to provide a deflation hedge, to reduce the overall volatility of plan assets and to produce current income in support of the needs of the plan. The purpose of alternative investments is the diversification benefit of alternative strategies."]
[]
[null,"Equity assets are to be allocated within certain ranges among the asset categories of large cap growth and value; small/midcap growth and value; and international growth and value. Each of the equity asset categories are assigned to an appropriate asset manager or mutual fund. Fixed income assets are allocated within a certain range to mutual funds of fixed income securities. Alternative investment assets are allocated within a certain range to mutual funds and may include the use of leverage. Short-selling, securities lending, financial futures, margins, options, and derivatives are not used. Investments in nonmarketable securities, commodities, or direct ownership of real estate are prohibited."]
[]
[null,"Rate-of-return-on-assets assumptions are made by major category of plan assets according to historical analysis, tempered for an assessment of possible future influences that could cause the returns to exceed or trail long-term patterns. The overall expected long-term rate-of-return-on-plan assets net of investment manager fees as at December 31, 2014, was 7.50%."]
[]
[]
[null,"Plan Assets--The fair values of our pension plan assets at December 31, 2014 by asset category, using the three-level hierarchy of fair value inputs, were as follows:  "]
[]
[]
[{"$nulls":7},"Fair Value Measurements at December 31, 2014 Using:"]
[null,"Description",null,"Total Carrying",null,null,null,"Quoted prices",null,null,null,"Significant",null,null,null,"Significant"]
[null,null,null,"Value at",null,null,null,"in",null,null,null,"other observable",null,null,null,"unobservable"]
[null,null,null,"2014-12-31",null,null,null,"active markets",null,null,null,"inputs",null,null,null,"inputs"]
[{"$nulls":7},"(Level 1)",null,null,null,"(Level 2)",null,null,null,"(Level 3)"]
[null,"Asset Category"]
[null,"Money market funds",null,"$",2442,null,null,"$","—",null,null,"$",2442,null,null,"$","—"]
[]
[null,"U.S. large-cap equities"]
[]
[null,"Growth",null,2625,null,null,null,2625,null,null,null,"—",null,null,null,"—"]
[]
[null,"Value",null,2088,null,null,null,2088,null,null,null,"—",null,null,null,"—"]
[]
[null,"U.S. small/mid-cap equities"]
[]
[null,"Growth",null,1623,null,null,null,1623,null,null,null,"—",null,null,null,"—"]
[]
[null,"Value",null,1844,null,null,null,1844,null,null,null,"—",null,null,null,"—"]
[]
[null,"International equities"]
[]
[null,"Growth",null,2128,null,null,null,2128,null,null,null,"—",null,null,null,"—"]
[]
[null,"Value",null,2124,null,null,null,2124,null,null,null,"—",null,null,null,"—"]
[]
[null,"Fixed income",null,3747,null,null,null,3747,null,null,null,"—",null,null,null,"—"]
[]
[null,"Multiclass world-allocation mutual funds",null,2946,null,null,null,2946,null,null,null,"—",null,null,null,"—"]
[]
[null,null,null,"$",21567,null,null,"$",19125,null,null,"$",2442,null,null,"$","—"]
[]
[]
[]
[null,"The fair values of our pension plan assets at December 31, 2013 by asset category, using the three-level hierarchy of fair value inputs, were as follows:"]
[]
[]
[null,"P.  ","Defined Benefit Pension Plans (continued)"]
[]
[]
[]
[{"$nulls":7},"Fair Value Measurements at December 31, 2013 Using:"]
[null,"Description",null,"Total Carrying",null,null,null,"Quoted prices",null,null,null,"Significant",null,null,null,"Significant"]
[null,null,null,"Value at",null,null,null,"in",null,null,null,"other observable",null,null,null,"unobservable"]
[null,null,null,"2013-12-31",null,null,null,"active markets",null,null,null,"inputs",null,null,null,"inputs"]
[{"$nulls":7},"(Level 1)",null,null,null,"(Level 2)",null,null,null,"(Level 3)"]
[null,"Asset Category"]
[null,"Money market funds",null,"$",1726,null,null,"$","—",null,null,"$",1726,null,null,"$","—"]
[]
[null,"U.S. large-cap equities"]
[]
[null,"Growth",null,3639,null,null,null,3639,null,null,null,"—",null,null,null,"—"]
[]
[null,"Value",null,2971,null,null,null,2971,null,null,null,"—",null,null,null,"—"]
[]
[null,"U.S. small/mid-cap equities"]
[]
[null,"Growth",null,1813,null,null,null,1813,null,null,null,"—",null,null,null,"—"]
[]
[null,"Value",null,1959,null,null,null,1959,null,null,null,"—",null,null,null,"—"]
[]
[null,"International equities"]
[]
[null,"Growth",null,2718,null,null,null,2718,null,null,null,"—",null,null,null,"—"]
[]
[null,"Value",null,2622,null,null,null,2622,null,null,null,"—",null,null,null,"—"]
[]
[null,"Fixed income",null,4423,null,null,null,4423,null,null,null,"—",null,null,null,"—"]
[]
[null,"Multiclass world-allocation mutual funds",null,3883,null,null,null,3883,null,null,null,"—",null,null,null,"—"]
[]
[null,null,null,"$",25754,null,null,"$",24028,null,null,"$",1726,null,null,"$","—"]
[]
[]
[null,"Within the pension plan asset categories, the Level 1 investments are publicly traded in active markets and are valued using the net asset value or closing price of the investment at the measurement date. Securities held by a money market fund are generally high quality and liquid; however, they are reflected as Level 2 because the inputs used to determine fair value are not quoted prices in an active market."]
[]
[null,"Expected Benefit Plan Contributions--We expect, as of December 31, 2014, to make defined-benefit contributions totaling $1,038 before December 31, 2015."]
[]
[null,"Expected Benefit Plan Payments--The benefits, as of December 31, 2014, expected to be paid to defined-benefit plan participants in each of the next five years, and in the aggregate for the five years thereafter, follow:"]
[]
[]
[null,null,null,"Participants Benefits"]
[null,"Estimated future payments"]
[null,"Year ending December 31, 2015",null,"$",1117]
[]
[null,2016,null,1268]
[]
[null,2017,null,1454]
[]
[null,2018,null,1529]
[]
[null,2019,null,1618]
[]
[null,"Years 2020 to 2024",null,9233]
[]
[]
[null,"Multiemployer Defined Benefit Pension Plans--In providing services to our Utility Services customers, we contribute to multiemployer defined benefit pension plans under the terms of collective-bargaining agreements that cover certain of our union-represented employees. "]
[]
[null,"These plans generally provide retirement benefits to participants based on their service to contributing employers. We do not administer these multiemployer plans. In general, these plans are managed by a board of trustees with the unions appointing certain trustees and other contributing employers of the plan appointing certain members. We generally are not represented on the board of trustees. "]
[]
[]
[null,"P.  ","Defined Benefit Pension Plans (continued)"]
[]
[null,"The risks of participating in these multiemployer plans are different from single-employer plans in that: (a) assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers; (b) if a participating employer stops contributing to the plan, the unfunded obligations of the plan may be assumed by the remaining participating employers; and, (c) if we choose to stop participating in a multiemployer plan, we may be required to pay the plan an amount based on the underfunded status of the plan, referred to as a withdrawal liability."]
[]
[null,"Our participation in the multiemployer defined benefit pension plans is summarized in the table below. The “EIN/Pension Plan Number” column provides the Employer Identification Number (“EIN”) and the three-digit plan number. The most recent Pension Protection Act of 2006 (the “PPA”) zone status is from the Form 5500, “Annual Return/Report of Employee Benefit Plan,” filed by the plan and certified by the plan's actuary. The PPA zone status describes plans that are underfunded. Among other factors, plans in the “critical” red zone are generally less than 65% funded; plans in the “endangered” yellow zone are less than 80% funded; and, plans in the “safe” green zone are at least 80% funded."]
[]
[]
[]
[null,"Pension Fund",null,"EIN/Pension",null,"Pension",null,null,null,"FIB/RP",null,"Davey Tree",{"$nulls":11},"Surcharge",null,"Expiration"]
[null,null,null,"Plan Number",null,"Protection Act",null,null,null,"Status",null,"Contributions",{"$nulls":11},"Imposed",null,"Dates of"]
[{"$nulls":5},"Zone Status",null,null,null,"Pending",{"$nulls":15},"Bargaining"]
[{"$nulls":5},2014,null,2013,null,"Implemented",null,2014,null,null,null,2013,null,null,null,2012,{"$nulls":5},"Agreement"]
[null,"National Electric Benefit Fund",null,"53-0181657/001",null,"Green",null,"Green",null,"No",null,"$",743,null,null,"$",755,null,null,"$",417,null,null,"No",null,"Ranging from December 31, 2014 to "]
[{"$nulls":25},"2017-12-31"]
[null,"Eighth District Electrical Pension Fund",null,"84-6100393/001",null,"Green",null,"Green",null,"No",null,105,null,null,null,100,null,null,null,75,null,null,null,"No",null,"2017-12-31"]
[]
[{"$nulls":11},"$",848,null,null,"$",855,null,null,"$",492]
[]
[]
[null,"We were not listed in the Form 5500 for either plan as having provided more than 5% of the total contributions. "]
[]
[null,"Both the National Electric Benefit Fund and the Eighth District Electrical Pension Fund are green zone status--safe--which represents at least 80% funded and does not require a “financial improvement plan” (“FIP”) or a “rehabilitation plan” (“RP”). "]
[]
[null,"We are party to eight collective-bargaining agreements with the National Electric Benefit Fund, with expiration dates ranging from December 31, 2014 (currently in negotiations) to December 31, 2017 and one collective-bargaining agreement with Eighth District Electrical Pension Fund with an expiration date of December 31, 2017."]

{"sheet":"Income_Taxes","index":24,"n_rows":165,"n_cols":13,"rows_kept":165,"cut":false,"hidden":false,"merged":[[143,1,143,12],[144,1,144,12],[145,1,145,12],[146,1,146,12],[147,1,147,12],[148,1,148,12],[123,1,123,12],[124,1,124,12],[127,1,127,12],[128,1,128,12],[129,1,129,12],[130,1,130,12],[117,1,117,12],[118,1,118,12],[119,1,119,12],[120,1,120,12],[121,1,121,12],[122,1,122,12],[39,1,39,12],[55,1,55,12],[56,1,56,12],[57,1,57,12],[58,1,58,12],[77,1,77,12],[4,1,4,12],[5,1,5,12],[16,1,16,12],[19,1,19,12],[20,1,20,12],[38,1,38,12],[164,9,165,9],[164,10,165,10],[164,11,165,11],[164,12,165,12],[0,0,1,0],[0,1,0,12],[1,1,1,12],[2,1,2,12],[3,0,165,0],[3,1,3,12],[162,10,163,11],[162,12,163,12],[164,1,165,1],[164,2,165,2],[164,3,165,3],[164,4,165,4],[164,5,165,5],[164,6,165,6],[164,7,165,7],[164,8,165,8],[160,9,161,9],[160,10,161,11],[160,12,161,12],[162,1,163,1],[162,2,163,3],[162,4,163,4],[162,5,163,5],[162,6,163,7],[162,8,163,8],[162,9,163,9],[160,1,161,1],[160,2,161,3],[160,4,161,4],[160,5,161,5],[160,6,161,7],[160,8,161,8],[157,9,158,9],[157,10,158,11],[157,12,158,12],[159,2,159,3],[159,6,159,7],[159,10,159,11],[157,1,158,1],[157,2,158,3],[157,4,158,4],[157,5,158,5],[157,6,158,7],[157,8,158,8],[153,12,154,12],[155,1,156,1],[155,2,156,3],[155,4,156,4],[155,5,156,5],[155,6,156,7],[155,8,156,8],[155,9,156,9],[155,10,156,11],[155,12,156,12],[153,6,154,6],[153,7,154,7],[153,8,154,8],[153,9,154,9],[153,10,154,10],[153,11,154,11],[149,1,149,12],[151,2,151,12],[152,2,152,4],[152,6,152,8],[152,10,152,12],[153,1,154,1],[153,2,154,2],[153,3,154,3],[153,4,154,4],[153,5,154,5],[141,1,142,1],[141,2,142,3],[141,4,142,4],[141,5,142,5],[141,6,142,7],[141,8,142,8],[139,1,140,1],[139,2,140,3],[139,4,140,4],[139,5,140,5],[139,6,140,7],[139,8,140,8],[135,7,136,7],[135,8,136,8],[137,1,138,1],[137,2,138,3],[137,4,138,4],[137,5,138,5],[137,6,138,7],[137,8,138,8],[131,1,131,8],[133,2,133,8],[134,2,134,4],[134,6,134,8],[135,1,136,1],[135,2,136,2],[135,3,136,3],[135,4,136,4],[135,5,136,5],[135,6,136,6],[115,1,116,1],[115,2,116,4],[115,5,116,5],[115,6,116,6],[115,7,116,7],[115,8,116,8],[113,1,114,1],[113,2,114,2],[113,3,114,3],[113,4,114,4],[113,5,114,5],[113,6,114,8],[111,1,112,1],[111,2,112,3],[111,4,112,4],[111,5,112,5],[111,6,112,7],[111,8,112,8],[109,1,110,1],[109,2,110,3],[109,4,110,4],[109,5,110,5],[109,6,110,7],[109,8,110,8],[107,1,108,1],[107,2,108,3],[107,4,108,4],[107,5,108,5],[107,6,108,7],[107,8,108,8],[105,1,106,1],[105,2,106,3],[105,4,106,4],[105,5,106,5],[105,6,106,7],[105,8,106,8],[103,1,104,1],[103,2,104,3],[103,4,104,4],[103,5,104,5],[103,6,104,7],[103,8,104,8],[101,1,102,1],[101,2,102,3],[101,4,102,4],[101,5,102,5],[101,6,102,7],[101,8,102,8],[99,1,100,1],[99,2,100,3],[99,4,100,4],[99,5,100,5],[99,6,100,7],[99,8,100,8],[97,1,98,1],[97,2,98,3],[97,4,98,4],[97,5,98,5],[97,6,98,7],[97,8,98,8],[95,1,96,1],[95,2,96,3],[95,4,96,4],[95,5,96,5],[95,6,96,7],[95,8,96,8],[93,1,94,1],[93,2,94,3],[93,4,94,4],[93,5,94,5],[93,6,94,7],[93,8,94,8],[91,1,92,1],[91,2,92,3],[91,4,92,4],[91,5,92,5],[91,6,92,7],[91,8,92,8],[89,1,90,1],[89,2,90,3],[89,4,90,4],[89,5,90,5],[89,6,90,7],[89,8,90,8],[86,2,86,4],[86,6,86,8],[87,1,88,1],[87,2,88,2],[87,3,88,3],[87,4,88,4],[87,5,88,5],[87,6,88,6],[87,7,88,7],[87,8,88,8],[75,7,76,7],[75,8,76,8],[82,1,82,8],[84,2,84,8],[85,2,85,4],[85,6,85,8],[80,1,80,12],[81,1,81,12],[75,1,76,1],[75,2,76,2],[75,3,76,3],[75,4,76,4],[75,5,76,5],[75,6,76,6],[73,1,74,1],[73,2,74,3],[73,4,74,4],[73,5,74,5],[73,6,74,7],[73,8,74,8],[69,8,70,8],[71,1,72,1],[71,2,72,3],[71,4,72,4],[71,5,72,5],[71,6,72,7],[71,8,72,8],[68,2,68,3],[68,6,68,7],[69,1,70,1],[69,2,70,3],[69,4,70,4],[69,5,70,5],[69,6,70,7],[66,1,67,1],[66,2,67,3],[66,4,67,4],[66,5,67,5],[66,6,67,7],[66,8,67,8],[63,2,63,4],[63,6,63,8],[64,1,65,1],[64,2,65,2],[64,3,65,3],[64,4,65,4],[64,5,65,5],[64,6,65,6],[64,7,65,7],[64,8,65,8],[51,8,52,8],[51,9,52,9],[59,1,59,8],[61,2,61,8],[62,2,62,4],[62,6,62,8],[48,7,49,7],[48,8,49,8],[48,9,49,9],[51,1,52,1],[51,2,52,2],[51,3,52,3],[51,4,52,4],[51,5,52,5],[51,6,52,6],[51,7,52,7],[45,6,46,6],[45,7,46,7],[45,8,46,8],[45,9,46,9],[48,1,49,1],[48,2,49,2],[48,3,49,3],[48,4,49,4],[48,5,49,5],[48,6,49,6],[40,1,40,9],[42,2,42,9],[43,2,43,3],[43,5,43,6],[43,8,43,9],[45,1,46,1],[45,2,46,2],[45,3,46,3],[45,4,46,4],[45,5,46,5],[36,7,37,7],[36,8,37,8],[36,9,37,9],[36,10,37,10],[36,11,37,11],[36,12,37,12],[36,1,37,1],[36,2,37,2],[36,3,37,3],[36,4,37,4],[36,5,37,5],[36,6,37,6],[32,12,33,12],[34,1,35,1],[34,2,35,3],[34,4,35,4],[34,5,35,5],[34,6,35,7],[34,8,35,8],[34,9,35,9],[34,10,35,11],[34,12,35,12],[30,10,31,11],[30,12,31,12],[32,1,33,1],[32,2,33,3],[32,4,33,4],[32,5,33,5],[32,6,33,7],[32,8,33,8],[32,9,33,9],[32,10,33,11],[28,9,29,9],[28,10,29,11],[28,12,29,12],[30,1,31,1],[30,2,31,3],[30,4,31,4],[30,5,31,5],[30,6,31,7],[30,8,31,8],[30,9,31,9],[28,1,29,1],[28,2,29,3],[28,4,29,4],[28,5,29,5],[28,6,29,7],[28,8,29,8],[26,7,27,7],[26,8,27,8],[26,9,27,9],[26,10,27,10],[26,11,27,11],[26,12,27,12],[26,1,27,1],[26,2,27,2],[26,3,27,3],[26,4,27,4],[26,5,27,5],[26,6,27,6],[21,1,21,12],[23,2,23,12],[24,2,24,4],[24,6,24,8],[24,10,24,12],[25,2,25,4],[25,6,25,8],[25,10,25,12],[14,7,15,7],[14,8,15,8],[14,9,15,9],[14,10,15,10],[14,11,15,11],[14,12,15,12],[14,1,15,1],[14,2,15,2],[14,3,15,3],[14,4,15,4],[14,5,15,5],[14,6,15,6],[10,12,11,12],[12,1,13,1],[12,2,13,3],[12,4,13,4],[12,5,13,5],[12,6,13,7],[12,8,13,8],[12,9,13,9],[12,10,13,11],[12,12,13,12],[10,6,11,6],[10,7,11,7],[10,8,11,8],[10,9,11,9],[10,10,11,10],[10,11,11,11],[6,1,6,12],[8,2,8,12],[9,2,9,4],[9,6,9,8],[9,10,9,12],[10,1,11,1],[10,2,11,2],[10,3,11,3],[10,4,11,4],[10,5,11,5]]}
["Income Taxes","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Income Tax Disclosure [Abstract]"]
["Income Taxes","Income Taxes"]
[]
[null,"Income before income taxes was attributable to the following sources:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"United States","$",30380,null,null,"$",29203,null,null,"$",35414]
[]
[null,"Canada",7920,null,null,null,6362,null,null,null,5244]
[]
[null,"Total","$",38300,null,null,"$",35565,null,null,"$",40658]
[]
[]
[]
[null,"Q.","Income Taxes (continued)"]
[]
[null,"The provision for income taxes follows:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Currently payable:"]
[null,"Federal","$",13159,null,null,"$",7089,null,null,"$",15853]
[]
[null,"State",2524,null,null,null,2183,null,null,null,2239]
[]
[null,"Canadian",2127,null,null,null,1724,null,null,null,1578]
[]
[null,"Total current",17810,null,null,null,10996,null,null,null,19670]
[]
[null,"Deferred taxes","(2,679",null,")",null,1716,null,null,null,"(3,607",null,")"]
[]
[null,"Total taxes on income","$",15131,null,null,"$",12712,null,null,"$",16063]
[]
[]
[null,"A reconciliation of the expected statutory U.S. federal rate to our actual effective income tax rate follows:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,2013,null,null,2012]
[null,"Statutory U.S. federal tax rate",35,"%",null,35," %",null,35," %"]
[null,"State income taxes, net of federal benefit",3.9,null,null,3.6,null,null,3.9]
[]
[null,"Effect of Canadian income taxes","(1.7",")",null,"(1.6",")",null,"(1.0",")"]
[null,"Nondeductible expenses",1.9,null,null,1.9,null,null,1.4]
[]
[null,"ESOP dividend deduction","(.7",")",null,"(.8",")",null,"(.7",")"]
[null,"Audit settlements and uncertain tax adjustments",1.6,null,null,"(2.2",")",null,1.8]
[]
[null,"All other, net","(.5",")",null,"(.2",")",null,"(.9",")"]
[null,"Effective income tax rate",39.5,"%",null,35.700000000000003," %",null,39.5," %"]
[]
[null,"Deferred income taxes reflect the tax effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes.  A valuation allowance is recorded when it is more-likely-than-not that an income tax benefit will not be realized."]
[]
[null,"Significant components of our current net deferred tax assets and liabilities at December 31, were as follows:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Deferred tax assets:"]
[null,"Accrued compensation obligations","$",3090,null,null,"$",1883]
[]
[null,"Self-insurance accruals",8107,null,null,null,7693]
[]
[null,"Prepaid expenses","(3,160",null,")",null,"(2,565",null,")"]
[null,"Other, net",1102,null,null,null,908]
[]
[null,null,9139,null,null,null,7919]
[]
[null,"Less deferred tax asset valuation allowance",212,null,null,null,204]
[]
[null,"Net deferred income tax assets--current","$",8927,null,null,"$",7715]
[]
[]
[]
[null,"Q.","Income Taxes (continued)"]
[]
[null,"Significant components of our noncurrent net deferred tax assets and liabilities at December 31, were as follows:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Deferred tax assets:"]
[null,"Self-insurance accruals","$",12554,null,null,"$",12129]
[]
[null,"Accrued expenses and other liabilities",1388,null,null,null,895]
[]
[null,"Accrued stock compensation",1642,null,null,null,1550]
[]
[null,"Defined benefit pension plans",4573,null,null,null,1873]
[]
[null,"Foreign tax credit carryforward",768,null,null,null,768]
[]
[null,"Other future deductible amounts, net",2030,null,null,null,1737]
[]
[null,null,22955,null,null,null,18952]
[]
[null,"Less deferred tax asset valuation allowance",556,null,null,null,564]
[]
[null,null,22399,null,null,null,18388]
[]
[null,"Deferred tax liabilities:"]
[]
[null,"Intangibles",269,null,null,null,234]
[]
[null,"Property and equipment",20425,null,null,null,20718]
[]
[null,null,20694,null,null,null,20952]
[]
[null,"Net deferred tax assets--noncurrent","$",1705]
[]
[null,"Net deferred tax liabilities--noncurrent",{"$nulls":4},"$",2564]
[]
[]
[null,"We treat all of our Canadian subsidiary earnings through December 31, 2014 as permanently reinvested and have not provided any U.S. federal or state tax thereon. As of December 31, 2014, approximately $30,459 of undistributed earnings attributable to our Canadian operations was considered to be indefinitely invested. Presently, our intention is to reinvest the earnings permanently."]
[]
[null,"If, in the future, these earnings are distributed to the U.S. in the form of dividends or otherwise, or if the Company determines such earnings will be remitted in the foreseeable future, the Company would be subject to U.S. income taxes and Canadian withholding taxes. It is not practicable to estimate the amount of taxes that would be payable upon remittance of these earnings given the various tax planning alternatives that we could employ should we decide to repatriate those earnings."]
[]
[null,"A deferred tax asset has been recorded for the portion of the foreign tax credit that is unavailable in the current year--the foreign tax credit carryforward arising in 2010--wherein we repatriated earnings of our Canadian operations due to capital in Canada in excess of current and future projected needs.  As a result, we recognized and recorded in 2010 additional U.S. federal and state taxes that were payable as a result of the repatriation of the previously undistributed earnings. A valuation allowance is required when it is more-likely-than-not that all or a portion of a deferred tax asset will not be realized. Because of the uncertainty regarding realization, a valuation allowance equal to the U.S. tax benefit of the foreign tax credit carryforward is recorded--$768 at December 31, 2014--which is subject to expiration in 2020, if not utilized."]
[]
[]
[]
[null,"Q.","Income Taxes (continued)"]
[]
[null,"The amount of income taxes we pay is subject to audit by U.S. federal, state, local and Canadian tax authorities, which may result in proposed assessments. Our estimate for the potential outcome for any uncertain tax issue is highly judgmental. Uncertain tax positions are recognized only if they are more-likely-than-not to be upheld during examination based on their technical merits. The measurement of the uncertain tax position is based on the largest benefit amount that is more-likely-than-not (determined on a cumulative probability basis) to be realized upon settlement of the matter. If payment of these amounts ultimately proves to be unnecessary, the reversal of the liabilities would result in tax benefits being recognized in the period when we determine the liabilities are no longer necessary. If the estimate of tax liabilities proves to be less than the ultimate settlement, a further charge to expense may result."]
[]
[null,"The balance of unrecognized benefits and the amount of related interest and penalties at December 31, were as follows:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Unrecognized tax benefits","$",1949,null,null,"$",1221]
[]
[null,"Portion, if recognized, would reduce tax expense and effective tax rate",1512,null,null,null,942]
[]
[null,"Accrued interest on unrecognized tax benefits",77,null,null,null,41]
[]
[null,"Accrued penalties on unrecognized benefits","—",null,null,null,"—"]
[]
[]
[null,"We recognize interest accrued related to unrecognized tax benefits in income tax expense. Penalties, if incurred, would be recognized as a component of income tax expense."]
[]
[null,"The Company is routinely under audit by U.S. federal, state, local and Canadian authorities in the area of income tax. These audits include questioning the timing and the amount of income and deductions and the allocation of income and deductions among various tax jurisdictions. During the fourth quarter 2013, the U.S. Internal Revenue Service completed its audit of the Company's U.S. income tax returns for 2010 and 2011 and, during 2010, Canada Revenue Agency completed its audit of the Company's Canadian operations for 2006, 2007 and 2008. With the exception of U.S. state jurisdictions, the Company is no longer subject to examination by tax authorities for the years through 2009. As of December 31, 2014, we believe it is reasonably possible that the total amount of unrecognized tax benefits will not significantly increase or decrease."]
[]
[null,"The changes in our unrecognized tax benefits are summarized in the table below:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Balance, beginning of year","$",1221,null,null,"$",2638,null,null,"$",1825]
[]
[null,"Additions based on tax positions related to the current year",587,null,null,null,370,null,null,null,667]
[]
[null,"Additions for tax positions of prior years",234,null,null,null,133,null,null,null,149]
[]
[null,"Reductions for tax positions of prior years","(79",null,")",null,"(1,155",null,")",null,"(3",null,")"]
[null,"Reductions related to settlements with taxing authorities","—",null,null,null,"(460",null,")",null,"—"]
[]
[null,"Lapses in statutes of limitations","(14",null,")",null,"(305",null,")",null,"—"]
[]
[null,"Balance, end of year","$",1949,null,null,"$",1221,null,null,"$",2638]

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["Earnings Per Share Information","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Earnings Per Share [Abstract]"]
["Earnings Per Share Information","Earnings Per Share Information"]
[]
[null,"Earnings per share is computed as follows:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Income available to common shareholders:"]
[null,"Net income","$",23169,null,null,"$",22853,null,null,"$",24595]
[]
[null,"Weighted-average shares:"]
[]
[null,"Basic:"]
[]
[null,"Outstanding",13337198,null,null,null,13639356,null,null,null,13867771]
[]
[null,"Partially-paid share subscriptions",484025,null,null,null,531325,null,null,null,234595]
[]
[null,"Basic weighted-average shares",13821223,null,null,null,14170681,null,null,null,14102366]
[]
[null,"Diluted:"]
[]
[null,"Basic from above",13821223,null,null,null,14170681,null,null,null,14102366]
[]
[null,"Incremental shares from assumed:"]
[]
[null,"Exercise of stock subscription purchase rights",54824,null,null,null,34273,null,null,null,5750]
[]
[null,"Exercise of stock options and awards",362229,null,null,null,397478,null,null,null,500741]
[]
[null,"Diluted weighted-average shares",14238276,null,null,null,14602432,null,null,null,14608857]
[]
[null,"Share data:"]
[]
[null,"Earnings per share--basic","$",1.68,null,null,"$",1.61,null,null,"$",1.74]
[]
[null,"Earnings per share--diluted","$",1.63,null,null,"$",1.57,null,null,"$",1.68]

{"sheet":"Operations_by_Business_Segment","index":26,"n_rows":126,"n_cols":21,"rows_kept":126,"cut":false,"hidden":false,"merged":[[14,1,14,20],[15,1,15,20],[16,1,16,20],[94,1,94,20],[95,1,95,20],[96,1,96,20],[8,1,8,20],[9,1,9,20],[10,1,10,20],[11,1,11,20],[12,1,12,20],[13,1,13,20],[0,0,1,0],[0,1,0,20],[1,1,1,20],[2,1,2,20],[3,0,126,0],[3,1,3,20],[4,1,4,20],[5,1,5,20],[6,1,6,20],[7,1,7,20],[125,7,126,7],[125,8,126,8],[125,9,126,9],[125,10,126,10],[125,11,126,11],[125,12,126,12],[123,8,124,8],[123,9,124,9],[123,10,124,11],[123,12,124,12],[125,1,126,1],[125,2,126,2],[125,3,126,3],[125,4,126,4],[125,5,126,5],[125,6,126,6],[121,8,122,8],[121,9,122,9],[121,10,122,10],[121,11,122,11],[121,12,122,12],[123,1,124,1],[123,2,124,3],[123,4,124,4],[123,5,124,5],[123,6,124,7],[119,9,120,9],[119,10,120,11],[119,12,120,12],[121,1,122,1],[121,2,122,2],[121,3,122,3],[121,4,122,4],[121,5,122,5],[121,6,122,6],[121,7,122,7],[119,1,120,1],[119,2,120,3],[119,4,120,4],[119,5,120,5],[119,6,120,7],[119,8,120,8],[116,2,116,4],[116,6,116,8],[116,10,116,12],[117,2,117,12],[118,2,118,4],[118,6,118,8],[118,10,118,12],[114,7,115,7],[114,8,115,8],[114,9,115,9],[114,10,115,10],[114,11,115,11],[114,12,115,12],[112,8,113,8],[112,9,113,9],[112,10,113,11],[112,12,113,12],[114,1,115,1],[114,2,115,2],[114,3,115,3],[114,4,115,4],[114,5,115,5],[114,6,115,6],[110,8,111,8],[110,9,111,9],[110,10,111,10],[110,11,111,11],[110,12,111,12],[112,1,113,1],[112,2,113,3],[112,4,113,4],[112,5,113,5],[112,6,113,7],[109,2,109,4],[109,6,109,8],[109,10,109,12],[110,1,111,1],[110,2,111,2],[110,3,111,3],[110,4,111,4],[110,5,111,5],[110,6,111,6],[110,7,111,7],[90,17,91,17],[90,18,91,19],[90,20,91,20],[105,1,105,12],[107,2,107,12],[108,2,108,4],[108,6,108,8],[108,10,108,12],[103,1,103,20],[104,1,104,20],[90,9,91,9],[90,10,91,11],[90,12,91,12],[90,13,91,13],[90,14,91,15],[90,16,91,16],[90,1,91,1],[90,2,91,3],[90,4,91,4],[90,5,91,5],[90,6,91,7],[90,8,91,8],[88,13,89,13],[88,14,89,15],[88,16,89,16],[88,17,89,17],[88,18,89,19],[88,20,89,20],[86,20,87,20],[88,1,89,1],[88,2,89,3],[88,4,89,4],[88,5,89,5],[88,6,89,7],[88,8,89,8],[88,9,89,9],[88,10,89,11],[88,12,89,12],[86,12,87,12],[86,13,87,13],[86,14,87,15],[86,16,87,16],[86,17,87,17],[86,18,87,19],[84,19,85,19],[84,20,85,20],[86,1,87,1],[86,2,87,3],[86,4,87,4],[86,5,87,5],[86,6,87,7],[86,8,87,8],[86,9,87,9],[86,10,87,11],[84,13,85,13],[84,14,85,14],[84,15,85,15],[84,16,85,16],[84,17,85,17],[84,18,85,18],[84,7,85,7],[84,8,85,8],[84,9,85,9],[84,10,85,10],[84,11,85,11],[84,12,85,12],[84,1,85,1],[84,2,85,2],[84,3,85,3],[84,4,85,4],[84,5,85,5],[84,6,85,6],[81,20,82,20],[83,2,83,4],[83,6,83,8],[83,10,83,12],[83,14,83,16],[83,18,83,20],[81,13,82,13],[81,14,82,15],[81,16,82,16],[81,17,82,17],[81,18,82,18],[81,19,82,19],[79,20,80,20],[81,1,82,1],[81,2,82,3],[81,4,82,4],[81,5,82,5],[81,6,82,7],[81,8,82,8],[81,9,82,9],[81,10,82,11],[81,12,82,12],[79,12,80,12],[79,13,80,13],[79,14,80,15],[79,16,80,16],[79,17,80,17],[79,18,80,19],[77,18,78,19],[77,20,78,20],[79,1,80,1],[79,2,80,3],[79,4,80,4],[79,5,80,5],[79,6,80,7],[79,8,80,8],[79,9,80,9],[79,10,80,11],[77,10,78,11],[77,12,78,12],[77,13,78,13],[77,14,78,15],[77,16,78,16],[77,17,78,17],[75,17,76,17],[75,18,76,19],[75,20,76,20],[77,1,78,1],[77,2,78,3],[77,4,78,4],[77,5,78,5],[77,6,78,7],[77,8,78,8],[77,9,78,9],[75,9,76,9],[75,10,76,11],[75,12,76,12],[75,13,76,13],[75,14,76,15],[75,16,76,16],[75,1,76,1],[75,2,76,3],[75,4,76,4],[75,5,76,5],[75,6,76,7],[75,8,76,8],[73,13,74,13],[73,14,74,15],[73,16,74,16],[73,17,74,17],[73,18,74,19],[73,20,74,20],[71,20,72,20],[73,1,74,1],[73,2,74,3],[73,4,74,4],[73,5,74,5],[73,6,74,7],[73,8,74,8],[73,9,74,9],[73,10,74,11],[73,12,74,12],[71,14,72,14],[71,15,72,15],[71,16,72,16],[71,17,72,17],[71,18,72,18],[71,19,72,19],[71,8,72,8],[71,9,72,9],[71,10,72,10],[71,11,72,11],[71,12,72,12],[71,13,72,13],[69,17,70,17],[69,18,70,19],[69,20,70,20],[71,1,72,1],[71,2,72,2],[71,3,72,3],[71,4,72,4],[71,5,72,5],[71,6,72,6],[71,7,72,7],[69,9,70,9],[69,10,70,11],[69,12,70,12],[69,13,70,13],[69,14,70,15],[69,16,70,16],[69,1,70,1],[69,2,70,3],[69,4,70,4],[69,5,70,5],[69,6,70,7],[69,8,70,8],[66,17,67,17],[66,18,67,19],[66,20,67,20],[68,2,68,4],[68,6,68,8],[68,10,68,12],[68,14,68,16],[68,18,68,20],[66,9,67,9],[66,10,67,11],[66,12,67,12],[66,13,67,13],[66,14,67,15],[66,16,67,16],[66,1,67,1],[66,2,67,3],[66,4,67,4],[66,5,67,5],[66,6,67,7],[66,8,67,8],[64,13,65,13],[64,14,65,15],[64,16,65,16],[64,17,65,17],[64,18,65,19],[64,20,65,20],[62,20,63,20],[64,1,65,1],[64,2,65,3],[64,4,65,4],[64,5,65,5],[64,6,65,7],[64,8,65,8],[64,9,65,9],[64,10,65,11],[64,12,65,12],[62,12,63,12],[62,13,63,13],[62,14,63,15],[62,16,63,16],[62,17,63,17],[62,18,63,19],[60,19,61,19],[60,20,61,20],[62,1,63,1],[62,2,63,3],[62,4,63,4],[62,5,63,5],[62,6,63,7],[62,8,63,8],[62,9,63,9],[62,10,63,11],[60,13,61,13],[60,14,61,14],[60,15,61,15],[60,16,61,16],[60,17,61,17],[60,18,61,18],[60,7,61,7],[60,8,61,8],[60,9,61,9],[60,10,61,10],[60,11,61,11],[60,12,61,12],[60,1,61,1],[60,2,61,2],[60,3,61,3],[60,4,61,4],[60,5,61,5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["Operations by Business Segment and Geographic Information","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Segment Reporting [Abstract]"]
["Operations by Business Segment and Geographic Information","Operations by Business Segment and Geographic Information"]
[]
[null,"We provide a wide range of arboriculture, horticulture, environmental and consulting services to residential, utility, commercial and government entities throughout the United States and Canada. We have two reportable operating segments organized by type or class of customer: Residential and Commercial, and Utility."]
[null,"Residential and Commercial--Residential and Commercial provides services to our residential and commercial customers including: the treatment, preservation, maintenance, removal, planting of trees, shrubs and other plant life; the practice of landscaping, grounds maintenance, tree surgery, tree feeding and tree spraying; the application of fertilizer, herbicides and insecticides; and, natural resource management and consulting, forestry research and development, and environmental planning."]
[null,"Utility--Utility is principally engaged in providing services to our utility customers--investor-owned, municipal utilities, and rural electric cooperatives--including: the practice of line-clearing and vegetation management around power lines, rights-of-way and chemical brush control; and, natural resource management and consulting, forestry research and development and environmental planning."]
[null,"All other operating activities, including research, technical support and laboratory diagnostic facilities, are included in “All Other.”"]
[null,"Measurement of Segment Profit and Loss and Segment Assets--We evaluate performance and allocate resources based primarily on operating income and also actively manage business unit operating assets. The accounting policies of the reportable segments are the same as those described in the summary of significant accounting policies except that (a) we compute and recognize depreciation expense for our segments only by the straight-line method and (b) state income taxes are allocated to the segments. Corporate expenses are substantially allocated among the operating segments, but the nature of expenses allocated may differ from year-to-year. There are no intersegment revenues."]
[]
[]
[null,"S.    Operations by Business Segment and Geographic Information (continued)"]
[]
[null,"Segment assets are those generated or directly used by each segment, and include accounts receivable, operating supplies, and property and equipment."]
[]
[null,"Information on reportable segments and reconciliation to the consolidated financial statements follows: "]
[]
[]
[null,null,"Utility",null,null,null,"Residential",null,null,null,"All",null,null,null," Reconciling",null,null,null,"Consolidated"]
[null,null,"Services",null,null,null,"Commercial",null,null,null,"Other",null,null,null," Adjustments"]
[{"$nulls":6},"Services"]
[null,"Fiscal Year 2014"]
[null,"Revenues","$",404519,null,null,"$",386274,null,null,"$","(882",")",null,"$","—",null,null,"$",789911]
[]
[null,"Income (loss) from operations",21382,null,null,null,37232,null,null,null,"(6,037",null,")",null,"(8,574",null,")","(a)",44003]
[]
[null,"Interest expense",{"$nulls":12},"(2,948",null,")",null,"(2,948",null,")"]
[]
[null,"Interest income",{"$nulls":12},295,null,null,null,295]
[]
[null,"Other income (expense), net",{"$nulls":12},"(3,050",null,")",null,"(3,050",null,")"]
[]
[null,"Income before income taxes",{"$nulls":16},"$",38300]
[]
[]
[null,"Depreciation","$",23225,null,null,"$",14544,null,null,"$","—",null,null,"$",3201,null,"(b)","$",40970]
[]
[null,"Amortization",174,null,null,null,1896,null,null,null,"—",null,null,null,"—",null,null,null,2070]
[]
[null,"Capital expenditures",25994,null,null,null,17490,null,null,null,"—",null,null,null,12247,null,null,null,55731]
[]
[null,"Segment assets, total",150002,null,null,null,144413,null,null,null,"—",null,null,null,86589,null,null,"(c)",381004]
[]
[]
[null,"Fiscal Year 2013"]
[]
[null,"Revenues","$",376520,null,null,"$",334878,null,null,"$",2450,null,null,"$","—",null,null,"$",713848]
[]
[null,"Income (loss) from operations",16070,null,null,null,33566,null,null,null,"(2,869",null,")",null,"(5,978",null,")","(a)",40789]
[]
[null,"Interest expense",{"$nulls":12},"(2,708",null,")",null,"(2,708",null,")"]
[]
[null,"Interest income",{"$nulls":12},311,null,null,null,311]
[]
[null,"Other income (expense), net",{"$nulls":12},"(2,827",null,")",null,"(2,827",null,")"]
[]
[null,"Income before income taxes",{"$nulls":16},"$",35565]
[]
[]
[null,"Depreciation","$",22261,null,null,"$",13286,null,null,"$","—",null,null,"$",2684,null,"(b)","$",38231]
[]
[null,"Amortization",359,null,null,null,1440,null,null,null,"—",null,null,null,181,null,null,null,1980]
[]
[null,"Capital expenditures",21642,null,null,null,17577,null,null,null,"—",null,null,null,5986,null,null,null,45205]
[]
[null,"Segment assets, total",145021,null,null,null,122542,null,null,null,"—",null,null,null,65815,null,null,"(c)",333378]
[]
[]
[null,"Fiscal Year 2012"]
[]
[null,"Revenues","$",375300,null,null,"$",303420,null,null,"$",1433,null,null,"$","—",null,null,"$",680153]
[]
[null,"Income (loss) from operations",20107,null,null,null,30787,null,null,null,"(1,366",null,")",null,"(3,761",null,")","(a)",45767]
[]
[null,"Interest expense",{"$nulls":12},"(2,698",null,")",null,"(2,698",null,")"]
[]
[null,"Interest income",{"$nulls":12},200,null,null,null,200]
[]
[null,"Other income (expense), net",{"$nulls":12},"(2,611",null,")",null,"(2,611",null,")"]
[]
[null,"Income before income taxes",{"$nulls":16},"$",40658]
[]
[]
[null,"Depreciation","$",22844,null,null,"$",12236,null,null,"$","—",null,null,"$",2285,null,"(b)","$",37365]
[]
[null,"Amortization",465,null,null,null,1058,null,null,null,"—",null,null,null,219,null,null,null,1742]
[]
[null,"Capital expenditures",15737,null,null,null,10266,null,null,null,"—",null,null,null,3731,null,null,null,29734]
[]
[null,"Segment assets, total",150294,null,null,null,122298,null,null,null,"—",null,null,null,58340,null,null,"(c)",330932]
[]
[]
[null,"S.","Operations by Business Segment and Geographic Information (continued)"]
[]
[null,"Reconciling adjustments from segment reporting to consolidated external financial reporting include unallocated corporate items:"]
[]
[]
[null,"(a)","Reconciling adjustments from segment reporting to consolidated external financial reporting include reclassification of depreciation expense and allocation of corporate expenses."]
[]
[null,"(b)","Adjustments to declining-balance method depreciation expense from straight-line method and depreciation and amortization of corporate assets."]
[]
[null,"(c)","Corporate assets include cash, prepaid expenses, corporate facilities, enterprise-wide information systems and other nonoperating assets."]
[]
[null,"Geographic Information--The following presents revenues and long-lived assets by geographic territory:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Revenues"]
[null,"United States","$",706145,null,null,"$",637524,null,null,"$",607339]
[]
[null,"Canada",83766,null,null,null,76324,null,null,null,72814]
[]
[null,null,"$",789911,null,null,"$",713848,null,null,"$",680153]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Long-lived assets, net"]
[]
[null,"United States","$",196116,null,null,"$",166598,null,null,"$",153946]
[]
[null,"Canada",17692,null,null,null,14764,null,null,null,15237]
[]
[null,null,"$",213808,null,null,"$",181362,null,null,"$",169183]

{"sheet":"Fair_Value_Measurements_and_Fi","index":27,"n_rows":81,"n_cols":17,"rows_kept":81,"cut":false,"hidden":false,"merged":[[76,1,76,17],[77,1,77,17],[78,1,78,17],[79,1,79,17],[80,1,80,17],[37,1,37,17],[56,1,56,17],[57,1,57,17],[58,1,58,17],[61,1,61,17],[62,1,62,17],[10,1,10,17],[11,1,11,17],[12,1,12,17],[13,1,13,17],[16,1,16,17],[17,1,17,17],[4,1,4,17],[5,1,5,17],[6,1,6,17],[7,1,7,17],[8,1,8,17],[9,1,9,17],[74,13,75,13],[74,14,75,14],[74,15,75,15],[74,16,75,16],[0,0,1,0],[0,1,0,17],[1,1,1,17],[2,1,2,17],[3,0,80,0],[3,1,3,17],[74,7,75,7],[74,8,75,8],[74,9,75,9],[74,10,75,10],[74,11,75,11],[74,12,75,12],[74,1,75,1],[74,2,75,2],[74,3,75,3],[74,4,75,4],[74,5,75,5],[74,6,75,6],[72,9,73,9],[72,10,73,11],[72,12,73,12],[72,13,73,13],[72,14,73,15],[72,16,73,16],[72,1,73,1],[72,2,73,3],[72,4,73,4],[72,5,73,5],[72,6,73,7],[72,8,73,8],[70,9,71,9],[70,10,71,11],[70,12,71,12],[70,13,71,13],[70,14,71,15],[70,16,71,16],[68,13,69,13],[68,14,69,14],[68,15,69,15],[68,16,69,16],[70,1,71,1],[70,2,71,3],[70,4,71,4],[70,5,71,5],[70,6,71,7],[70,8,71,8],[68,7,69,7],[68,8,69,8],[68,9,69,9],[68,10,69,10],[68,11,69,11],[68,12,69,12],[68,1,69,1],[68,2,69,2],[68,3,69,3],[68,4,69,4],[68,5,69,5],[68,6,69,6],[67,6,67,8],[66,9,67,9],[66,10,66,12],[67,10,67,12],[66,13,67,13],[66,14,66,16],[67,14,67,16],[54,16,55,16],[54,17,55,17],[63,1,63,16],[65,2,65,8],[65,10,65,16],[66,1,67,1],[66,2,66,4],[67,2,67,4],[66,5,67,5],[66,6,66,8],[54,10,55,10],[54,11,55,11],[54,12,55,12],[54,13,55,13],[54,14,55,14],[54,15,55,15],[52,17,53,17],[54,1,55,1],[54,2,55,2],[54,3,55,3],[54,4,55,4],[54,5,55,5],[54,6,55,6],[54,7,55,7],[54,8,55,8],[54,9,55,9],[52,9,53,9],[52,10,53,10],[52,11,53,12],[52,13,53,13],[52,14,53,14],[52,15,53,16],[52,1,53,1],[52,2,53,2],[52,3,53,4],[52,5,53,5],[52,6,53,6],[52,7,53,8],[49,15,50,16],[49,17,50,17],[51,3,51,5],[51,7,51,9],[51,11,51,13],[51,15,51,17],[49,7,50,8],[49,9,50,9],[49,10,50,10],[49,11,50,12],[49,13,50,13],[49,14,50,14],[47,13,48,13],[47,14,48,14],[47,15,48,15],[47,16,48,16],[47,17,48,17],[49,1,50,1],[49,2,50,2],[49,3,50,4],[49,5,50,5],[49,6,50,6],[47,7,48,7],[47,8,48,8],[47,9,48,9],[47,10,48,10],[47,11,48,11],[47,12,48,12],[46,3,46,5],[46,7,46,9],[46,11,46,13],[46,15,46,17],[47,1,48,1],[47,2,48,2],[47,3,48,3],[47,4,48,4],[47,5,48,5],[47,6,48,6],[42,15,42,17],[43,15,43,17],[44,15,44,17],[45,3,45,5],[45,7,45,9],[45,11,45,13],[45,15,45,17],[42,7,44,9],[42,10,44,10],[42,11,42,13],[43,11,43,13],[44,11,44,13],[42,14,44,14],[42,1,44,1],[42,2,44,2],[42,3,42,5],[43,3,43,5],[44,3,44,5],[42,6,44,6],[34,16,35,16],[34,17,35,17],[38,1,38,17],[40,1,41,1],[40,2,41,2],[40,3,41,5],[40,6,41,6],[40,7,40,17],[41,7,41,17],[36,1,36,17],[34,10,35,10],[34,11,35,11],[34,12,35,12],[34,13,35,13],[34,14,35,14],[34,15,35,15],[32,17,33,17],[34,1,35,1],[34,2,35,2],[34,3,35,3],[34,4,35,4],[34,5,35,5],[34,6,35,6],[34,7,35,7],[34,8,35,8],[34,9,35,9],[32,9,33,9],[32,10,33,10],[32,11,33,12],[32,13,33,13],[32,14,33,14],[32,15,33,16],[32,1,33,1],[32,2,33,2],[32,3,33,4],[32,5,33,5],[32,6,33,6],[32,7,33,8],[29,15,30,16],[29,17,30,17],[31,3,31,5],[31,7,31,9],[31,11,31,13],[31,15,31,17],[29,7,30,8],[29,9,30,9],[29,10,30,10],[29,11,30,12],[29,13,30,13],[29,14,30,14],[27,13,28,13],[27,14,28,14],[27,15,28,15],[27,16,28,16],[27,17,28,17],[29,1,30,1],[29,2,30,2],[29,3,30,4],[29,5,30,5],[29,6,30,6],[27,7,28,7],[27,8,28,8],[27,9,28,9],[27,10,28,10],[27,11,28,11],[27,12,28,12],[26,3,26,5],[26,7,26,9],[26,11,26,13],[26,15,26,17],[27,1,28,1],[27,2,28,2],[27,3,28,3],[27,4,28,4],[27,5,28,5],[27,6,28,6],[22,15,22,17],[23,15,23,17],[24,15,24,17],[25,3,25,5],[25,7,25,9],[25,11,25,13],[25,15,25,17],[22,7,24,9],[22,10,24,10],[22,11,22,13],[23,11,23,13],[24,11,24,13],[22,14,24,14],[22,1,24,1],[22,2,24,2],[22,3,22,5],[23,3,23,5],[24,3,24,5],[22,6,24,6],[18,1,18,17],[20,1,21,1],[20,2,21,2],[20,3,21,5],[20,6,21,6],[20,7,20,17],[21,7,21,17]]}
["Fair Value Measurements and Financial Instruments","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Fair Value Disclosures [Abstract]"]
["Fair Value Measurements and Financial Instruments","Fair Value Measurements and Financial Instruments"]
[]
[null,"Financial Accounting Standards Board Accounting Standard Codification 820, “Fair Value of Measurements and Disclosures (“Topic 820”)” defines fair value based on the price that would be received to sell an asset or the exit price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. Market participants are defined as buyers or sellers in the principal or most advantageous market for the asset or liability that are independent of the reporting entity, knowledgeable and able and willing to transact for the asset or liability."]
[]
[null,"Valuation Hierarchy--Topic 820 establishes a fair value hierarchy that prioritizes observable and unobservable inputs used to measure fair value. The hierarchy prioritizes the inputs into three broad levels:"]
[]
[null,"Level 1 inputs are quoted prices in active markets for identical assets or liabilities that the entity has the ability to access. "]
[null,"Level 2 inputs are observable inputs other than prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated with observable market data. "]
[null,"Level 3 inputs are unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs."]
[]
[]
[]
[null,"T.","Fair Value Measurements and Financial Instruments (continued)"]
[]
[null,"Our assets and liabilities measured at fair value on a recurring basis at December 31, 2014 and December 31, 2013, were as follows:"]
[]
[]
[{"$nulls":7},"Fair Value Measurements at"]
[{"$nulls":7},"December 31, 2014 Using:"]
[null,null,null,"Total",null,null,null,"Quoted prices in active markets",null,null,null,"Significant",null,null,null,"Significant"]
[null,null,null,"Carrying",{"$nulls":7},"other observable",null,null,null,"unobservable"]
[null,null,null,"Value at",{"$nulls":7},"inputs",null,null,null,"inputs"]
[null,"Description",null,"December 31, 2014",null,null,null,"(Level 1)",null,null,null,"(Level 2)",null,null,null,"(Level 3)"]
[null,"Assets:"]
[null,"Assets invested for self-insurance, classified as other assets, noncurrent",null,"$",13684,null,null,"$",13684,null,null,"$","—",null,null,"$","—"]
[]
[null,"Defined benefit pension plan assets",null,21567,null,null,null,19125,null,null,null,2442,null,null,null,"—"]
[]
[]
[null,"Liabilities:"]
[]
[null,"Deferred compensation",null,"$",1423,null,null,"$","—",null,null,"$",1423,null,null,"$","—"]
[]
[]
[]
[]
[]
[{"$nulls":7},"Fair Value Measurements at"]
[{"$nulls":7},"December 31, 2013 Using:"]
[null,null,null,"Total",null,null,null,"Quoted prices in active markets",null,null,null,"Significant",null,null,null,"Significant"]
[null,null,null,"Carrying",{"$nulls":7},"other observable",null,null,null,"unobservable"]
[null,null,null,"Value at",{"$nulls":7},"inputs",null,null,null,"inputs"]
[null,"Description",null,"December 31, 2013",null,null,null,"(Level 1)",null,null,null,"(Level 2)",null,null,null,"(Level 3)"]
[null,"Assets:"]
[null,"Assets invested for self-insurance, classified as other assets, noncurrent",null,"$",12716,null,null,"$",12716,null,null,"$","—",null,null,"$","—"]
[]
[null,"Defined benefit pension plan assets",null,25754,null,null,null,24028,null,null,null,1726,null,null,null,"—"]
[]
[]
[null,"Liabilities:"]
[]
[null,"Deferred compensation",null,"$",1144,null,null,"$","—",null,null,"$",1144,null,null,"$","—"]
[]
[]
[null,"The estimated fair value of the deferred compensation--classified as Level 2--is based on the value of the Company's common shares, determined by independent valuation."]
[]
[]
[null,"T.","Fair Value Measurements and Financial Instruments (continued)"]
[]
[null,"Fair Value of Financial Instruments--The fair values of our current financial assets and current liabilities, including cash, accounts receivable, accounts payable, and accrued expenses among others, approximate their reported carrying values because of their short-term nature. The assets invested for self-insurance are money market funds--classified as Level 1--based on quoted market prices of the identical underlying securities in active markets. The estimated fair value of our derivative instruments are calculated based on market rates to settle the instruments, as discussed below, representing the amount we would receive upon sale or pay upon transfer. Financial instruments classified as noncurrent liabilities and their carrying values and fair values were as follows:"]
[]
[]
[null,null,"December 31, 2014",{"$nulls":7},"December 31, 2013"]
[null,null,"Carrying",null,null,null,"Fair",null,null,null,"Carrying",null,null,null,"Fair"]
[null,null,"Value",null,null,null,"Value",null,null,null,"Value",null,null,null,"Value"]
[null,"Revolving credit facility, noncurrent","$",44500,null,null,"$",44500,null,null,"$",20000,null,null,"$",20000]
[]
[null,"Senior unsecured notes",30000,null,null,null,30688,null,null,null,30000,null,null,null,28219]
[]
[null,"Term loans, noncurrent",6806,null,null,null,7195,null,null,null,34,null,null,null,34]
[]
[null,"Total","$",81306,null,null,"$",82383,null,null,"$",50034,null,null,"$",48253]
[]
[]
[]
[null,"The carrying value of our revolving credit facility approximates fair value--classified as Level 2--as the interest rates on the amounts outstanding are variable. The fair value of our senior unsecured notes and term loans--classified as Level 2--is determined based on expected future weighted-average interest rates with the same remaining maturities."]
[]
[null,"Market Risk--In the normal course of business, we are exposed to market risk related to changes in foreign currency exchange rates, changes in interest rates and changes in fuel prices. We do not hold or issue derivative financial instruments for trading or speculative purposes. In prior years, we have used derivative financial instruments to manage risk, in part, associated with changes in interest rates and changes in fuel prices. Presently, we are not engaged in any hedging or derivative activities."]

{"sheet":"Commitments_and_Contingencies","index":28,"n_rows":30,"n_cols":3,"rows_kept":30,"cut":false,"hidden":false,"merged":[[28,1,28,2],[29,1,29,2],[22,1,22,2],[23,1,23,2],[24,1,24,2],[25,1,25,2],[26,1,26,2],[27,1,27,2],[14,1,14,2],[15,1,15,2],[16,1,16,2],[17,1,17,2],[18,1,18,2],[19,1,19,2],[8,1,8,2],[9,1,9,2],[10,1,10,2],[11,1,11,2],[12,1,12,2],[13,1,13,2],[0,0,1,0],[0,1,0,2],[1,1,1,2],[2,1,2,2],[3,0,29,0],[3,1,3,2],[4,1,4,2],[5,1,5,2],[6,1,6,2],[7,1,7,2]]}
["Commitments and Contingencies","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Commitments and Contingencies Disclosure [Abstract]"]
["Commitments and Contingencies","Commitments and Contingencies"]
[]
[null,"Letters of Credit "]
[]
[null,"At December 31, 2014, we were contingently liable to our principal banks in the amount of $61,540 for letters of credit outstanding primarily related to insurance coverage."]
[]
[null,"Surety Bonds"]
[]
[null,"In certain circumstances, we have performance obligations that are supported by surety bonds in connection with our contractual commitments."]
[]
[null,"Litigation"]
[]
[null,"We are party to a number of lawsuits, threatened lawsuits and other claims arising out of the normal course of business."]
[null,"     "]
[null,"With respect to all such matters, we record an accrual for a loss contingency when it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. In addition, narrative information is provided for matters as to which management believes a material loss is reasonably possible."]
[]
[null,"Management has assessed all such matters, including the matter described below, based on current information and made a judgment concerning their potential outcome, giving due consideration to the nature of the claim, the amount and nature of damages sought and the probability of success.  Management's judgment is made subject to the known uncertainty of litigation and management's judgment as to estimates made may prove materially different from actual results."]
[]
[null,"U.","Commitments and Contingencies (continued)"]
[]
[null,"California Fire Litigation: San Diego County--Davey Tree Surgery Company, a Davey subsidiary, and Davey Resource Group, a Davey division, along with the Company have previously been sued, together with a utility services customer, San Diego Gas & Electric (\"SDG&E\"), and its parent company, as defendants, and as cross-defendants in cross-complaints filed by SDG&E, in the Superior Court of the State of California in and for the County of San Diego, arising out of a wildfire in San Diego County that started on October 22, 2007, referred to as the Rice Canyon fire. "]
[]
[null,"Numerous lawsuits related to the Rice Canyon fire were filed against SDG&E, its parent company, Sempra Energy, and Davey. The earliest of the lawsuits naming Davey was filed on April 18, 2008. The Court ordered that the lawsuits be organized into four groups based on type of plaintiff, namely insurance subrogation claimants, individual/business claimants, governmental claimants, and plaintiffs seeking class certification. Plaintiffs' motions seeking class certification were denied and the orders denying class certification were affirmed on appeal. SDG&E filed cross-complaints against Davey for contractual indemnity, declaratory relief, and breach of contract. "]
[]
[null,"During the third quarter 2012, Davey entered into a Settlement and Release Agreement (the “Agreement”) among Davey, SDG&E and Davey's insurers. "]
[]
[null,"Under the Agreement (a) Davey paid SDG&E an amount previously expensed and accrued as self-insurance, (b) Davey's insurers paid SDG&E amounts under Davey's insurance policies in effect during the period of the Rice Canyon fire, and (c) SDG&E dismissed its cross-complaints against Davey and agreed to defend and hold harmless Davey from any and all claims that are currently asserted against Davey."]

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["Quarterly Results of Operations","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Quarterly Financial Information Disclosure [Abstract]"]
["Quarterly Results of Operations (Unaudited)","Quarterly Results of Operations (Unaudited)"]
[]
[null,"The following is a summary of the results of operations for each quarter of 2014 and 2013. "]
[]
[]
[null,null,"Fiscal 2014, Three Months Ended"]
[null,null,"2015-03-29",null,null,null,"2015-06-29",null,null,null,"2015-09-27",null,null,null,"2015-12-31"]
[null,"Revenues","$",157387,null,null,"$",213183,null,null,"$",216604,null,null,"$",202737]
[]
[null,"Gross profit (revenues less costs and expenses, operating)",48156,null,null,null,82900,null,null,null,77613,null,null,null,72565]
[]
[null,"Income (loss) from operations","(4,725",null,")",null,23815,null,null,null,17144,null,null,null,7769]
[]
[null,"Net income (loss)","(6,180",null,")",null,14046,null,null,null,9657,null,null,null,5646]
[]
[]
[null,"Net income (loss) per share--Basic","$","(.29",")",null,"$",1.04,null,null,"$",0.72,null,null,"$",0.21]
[]
[null,"Net income (loss) per share -- Diluted:","$","(.29",")",null,"$",1.01,null,null,"$",0.69,null,null,"$",0.22]
[]
[]
[null,"ESOT Valuation per share","$",26.4,null,null,"$",26.4,null,null,"$",27.8,null,null,"$",30.1]
[]
[]
[]
[]
[null,null,"Fiscal 2013, Three Months Ended"]
[null,null,"2015-03-30",null,null,null,"2015-06-29",null,null,null,"2015-09-28",null,null,null,"2015-12-31"]
[null,"Revenues","$",143265,null,null,"$",195638,null,null,"$",194772,null,null,"$",180173]
[]
[null,"Gross profit (revenues less costs and expenses, operating)",42205,null,null,null,76046,null,null,null,69114,null,null,null,63837]
[]
[null,"Income (loss) from operations","(6,009",null,")",null,23230,null,null,null,14881,null,null,null,8687]
[]
[null,"Net income (loss)","(4,612",null,")",null,13436,null,null,null,8644,null,null,null,5385]
[]
[]
[null,"Net income (loss) per share -- Basic","$","(.33",")",null,"$",0.97,null,null,"$",0.63,null,null,"$",0.34]
[]
[null,"Net income (loss) per share -- Diluted","$","(.33",")",null,"$",0.94,null,null,"$",0.61,null,null,"$",0.35]
[]
[]
[null,"ESOT Valuation per share","$",23.2,null,null,"$",23.2,null,null,"$",23.9,null,null,"$",26.4]
[]
[]
[null,"Fourth quarters 2014 and 2013 include a decrease in casualty insurance expense that had the effect of increasing the fourth quarter gross profit for 2014 and 2013 by approximately $3,875 and $3,951, respectively."]

{"sheet":"Summary_of_Significant_Account1","index":30,"n_rows":55,"n_cols":3,"rows_kept":55,"cut":false,"hidden":false,"merged":[[49,1,49,2],[50,0,54,0],[50,1,50,2],[51,1,51,2],[52,1,52,2],[53,1,53,2],[54,1,54,2],[41,1,41,2],[42,1,42,2],[43,0,48,0],[43,1,43,2],[44,1,44,2],[47,1,47,2],[48,1,48,2],[34,1,34,2],[35,1,35,2],[36,0,40,0],[36,1,36,2],[37,1,37,2],[38,1,38,2],[39,1,39,2],[40,1,40,2],[27,1,27,2],[28,0,32,0],[28,1,28,2],[31,1,31,2],[32,1,32,2],[33,1,33,2],[20,0,26,0],[20,1,20,2],[21,1,21,2],[22,1,22,2],[23,1,23,2],[24,1,24,2],[25,1,25,2],[26,1,26,2],[13,1,13,2],[14,0,18,0],[14,1,14,2],[17,1,17,2],[18,1,18,2],[19,1,19,2],[6,1,6,2],[0,0,1,0],[0,1,0,2],[1,1,1,2],[2,1,2,2],[3,1,3,2],[4,1,4,2],[5,0,12,0],[5,1,5,2],[12,1,12,2]]}
["Summary of Significant Accounting Policies (Policies)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Accounting Policies [Abstract]"]
["Principles of Consolidation and Basis of Presentation [Text Block]","Principles of Consolidation and Basis of Presentation--The consolidated financial statements include the accounts of Davey Tree and our wholly-owned subsidiaries and were prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) as codified in the Financial Accounting Standards Board (\"FASB\") Accounting Standards Codification (\"ASC\"). Intercompany accounts and transactions have been eliminated in consolidation."]
["Use of Estimates in Financial Statement Preparation [Policy Text Block]","Use of Estimates in Financial Statement Preparation--The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect reported amounts. Estimates are used for, but not limited to, accounts receivable valuation, depreciable lives of fixed assets, self-insurance accruals, and revenue recognition. Actual results could differ from those estimates."]
["Property and Equipment [Policy Text Block]","Property and Equipment--Property and equipment are stated at cost. Repair and maintenance costs are expensed as incurred. Depreciation is computed for financial reporting purposes by the straight-line method for land improvements, building and leasehold improvements and by the declining-balance method for equipment, based on the estimated useful lives of the assets, as follows:"]
[]
[]
[null,"Land improvements","5 to 20 years"]
[null,"Buildings","5 to 20 years"]
[null,"Equipment","3 to 10 years"]
[null,"Leasehold improvements","Shorter of lease term or estimated useful life; ranging from 5-to-20 years"]
[]
["Intangible Assets [Policy Text Block]","Intangible Assets--Intangible assets with finite lives, primarily customer lists, noncompete agreements and tradenames, are amortized by the straight-line method based on their estimated useful lives, ranging from one-to-ten years."]
["Long-Lived Assets [Policy Text Block]","Long-Lived Assets--We assess potential impairment to our long-lived assets, other than goodwill, when there is evidence that events or changes in circumstances have made recovery of the asset’s carrying value unlikely and the carrying amount of the asset exceeds the estimated future undiscounted cash flow. In the event the assessment indicates that the carrying amounts "]
[]
[null,"B.","Summary of Significant Accounting Policies (continued)"]
[]
[null,"may not be recoverable, an impairment loss would be recognized to reduce the asset’s carrying amount to its estimated fair value based on the present value of the estimated future cash flows."]
["Goodwill [Policy Text Block]","Goodwill--Goodwill is recorded when the cost of acquired businesses exceeds the fair value of the identified net assets acquired. Goodwill is not amortized, but tested for impairment annually or when events or circumstances indicate that impairment may have occurred. Annually, we perform the impairment tests for goodwill during the fourth quarter. Impairment of goodwill is tested at the reporting-unit level, which for us are also our business segments. Impairment of goodwill is tested by comparing the reporting unit’s carrying value, including goodwill, to the fair value of the reporting unit. The fair values of the reporting units are estimated using discounted projected cash flows. If the carrying value of the reporting unit exceeds its fair value, goodwill is considered impaired and a second step is performed to measure the amount of impairment loss, if any. We conducted our annual impairment tests and determined that no impairment loss was required to be recognized in 2014 or for any prior periods. There were no events or circumstances from the date of our assessment through December 31, 2014 that would impact this conclusion."]
["Self-Insurance Accruals [Policy Text Block]","Self-Insurance Accruals--We are generally self-insured for losses and liabilities related primarily to workers’ compensation, vehicle liability and general liability claims. We use commercial insurance as a risk-reduction strategy to minimize catastrophic losses. Ultimate losses are accrued based upon estimates of the aggregate liability for claims incurred using certain actuarial assumptions followed in the insurance industry and based on Company-specific experience."]
[]
[null,"Our self-insurance accruals include claims for which the ultimate losses will develop over a period of years. Accordingly, our estimates of ultimate losses can change as claims mature. Our accruals also are affected by changes in the number of new claims incurred and claim severity. The methods for estimating the ultimate losses and the total cost of claims were determined by third-party consulting actuaries; the resulting accruals are reviewed by management, and any adjustments arising from changes in estimates are reflected in income."]
[]
[null,"The workers' compensation accruals are discounted as the amount and timing of cash payments related to those accruals are reliably determinable given the nature of workers' compensation benefits and the level of historical claim volume to support the actuarial assumptions and judgments used to derive the expected loss payment pattern. The workers' compensation accruals are discounted using an interest rate that approximates the long-term investment yields over the expected payment pattern of unpaid losses."]
[]
[null,"Our self-insurance accruals are based on estimates and, while we believe that the amounts accrued are adequate and not excessive, the ultimate claims may be in excess of or less than the amounts provided."]
["Stock-Based Compensation [Policy Text Block]","Stock-Based Compensation--Stock-based compensation cost for all share-based payment plans is measured at fair value on the date of grant and recognized over the employee service period on the straight-line recognition method for awards expected to vest. The fair value of all stock-based payment plans—stock option plans, stock-settled stock appreciation rights, and performance-based restricted stock units as well as our Employee Stock Purchase Plan—is determined by the number of awards granted and the price of our common stock. The fair value of each award is estimated on the date of grant using a binomial option-pricing model. The binomial model considers a range of assumptions related to volatility, risk-free interest rate and employee exercise behavior. Expected volatilities utilized in the binomial model are based on historical volatility of our share prices and other factors. Similarly, the dividend yield is based on historical experience and expected future changes. The binomial model also incorporates exercise and forfeiture assumptions based on an analysis of historical data. The expected life of the stock-based awards is derived from the output of the binomial model and represents the period of time that awards granted are expected to be outstanding."]
["Defined Benefit Pension Plans [Policy Text Block]","Defined Benefit Pension Plans--We record annual expenses relating to our defined benefit pension plans based on calculations that include various actuarial assumptions, including discount rates and expected long-term rates of return on plan assets. Actuarial assumptions are reviewed annually with modifications made to the assumptions, if necessary, based on current rates and trends. The effects of the actuarial gains or losses are amortized over future service periods. The funded status (that is, the projected benefit obligation less the fair value of plan assets) for each plan is reported in our balance sheet "]
[]
[null,"B.","Summary of Significant Accounting Policies (continued)"]
[]
[null,"using a December 31 measurement date. Changes in the funded status of the plans are recognized in the year in which the changes occur and reported in comprehensive income (loss)."]
["Income Taxes [Policy Text Block]","Income Taxes--We compute taxes on income in accordance with the tax rules and regulations where the income is earned. The income tax rates imposed by these taxing authorities vary. Taxable income may differ from pretax income for financial reporting purposes. We compute and recognize deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial statement carrying amounts and the tax bases of our assets and liabilities. Changes in tax rates and laws are reflected in income in the period when such changes are enacted. We account for uncertain tax positions by recognizing the financial statement effects of a tax position only when, based upon the technical merits, it is more-likely-than-not that the position will be sustained upon examination."]
["Earnings Per Share [Policy Text Block]","Earnings Per Share--Basic earnings per share is determined by dividing the income available to common shareholders by the weighted-average number of common shares outstanding. Diluted earnings per share is computed similarly to basic earnings per share except that the weighted-average number of shares is increased to include the effect of stock awards that were granted and outstanding during the period."]
["Revenue Recognition [Policy Text Block]","Revenue Recognition--Revenues from residential and commercial services are recognized as the services are provided and amounts are determined to be collectible. Revenues from contractual arrangements, primarily with utility services customers, are recognized based on costs incurred to total estimated contract costs. During the performance of such contracts, estimated final contract prices and costs are periodically reviewed and revisions are made, as required, to the revenue recognized. On cost-plus-fee contracts, revenue is recognized to the extent of costs incurred plus a proportionate amount of fees earned, and on time-and-material contracts, revenue is recognized to the extent of billable rates times hours worked, plus material and other reimbursable costs incurred. Revisions arise in the normal course of providing services to utility services customers and generally relate to changes in contract specifications and cost allowability. Such revisions are recorded when realization is probable and can be reliably estimated."]
["Concentration of Credit Risk [Policy Text Block]","Concentration of Credit Risk--Credit risk represents the accounting loss that would be recognized if the counterparties failed to perform as contracted. The principal financial instruments subject to credit risk follow:"]
[]
[null,"Cash--To limit our exposure, we transact our business and maintain banking relationships and our derivative contracts with high credit-quality financial institutions."]
[]
[null,"Accounts Receivable--Our residential and commercial customers are located geographically throughout the United States and Canada and, as to commercial customers, within differing industries; thus, minimizing credit risk. The credit exposure of utility services customers is directly affected by conditions within the utility industries as well as the financial condition of individual customers. One utility customer approximated 8% of revenues during 2014, 9% in 2013 and 10% in 2012. To reduce credit risk, we evaluate the credit of customers, but generally do not require advance payments or collateral. Exposure to losses on receivables is principally dependent on each customer’s financial condition."]
["Currency Translation Adjustments [Policy Text Block]","Currency Translation Adjustments--All assets and liabilities of our Canadian operations are translated into United States dollars at year-end exchange rates while revenues and expenses are translated at weighted-average exchange rates in effect during the year. Translation adjustments are recorded as accumulated other comprehensive income (loss) in shareholders’ equity."]
["Interst Rate Risk Management [Policy Text Block]","Interest Rate Risk Management--We have entered into interest rate contracts, from time-to-time, with the objective of altering interest rate exposures related to variable rate debt. In the interest rate contracts, we have agreed with a financial institution to exchange, at specified intervals, the difference between fixed and floating interest amounts calculated on an agreed-upon notional principal amount."]
["Comprehensive Income (Loss) [Policy Text Block]","Comprehensive Income (Loss)--Comprehensive income (loss) includes net income and other comprehensive income or loss. Other comprehensive income (loss) refers to revenues, expenses, gains and losses that under U.S. GAAP are included in "]
[]
[]
[null,"B.","Summary of Significant Accounting Policies (continued)"]
[]
[null,"comprehensive income but are excluded from net income as these amounts are recorded directly as an adjustment to shareholders’ equity, net of tax."]
["Business Combinations Policy [Policy Text Block]","The net assets of the businesses acquired are accounted for under the acquisition method and were recorded at their fair values at the dates of acquisition."]
["Commitments and Contingencies, Policy [Policy Text Block]","We are party to a number of lawsuits, threatened lawsuits and other claims arising out of the normal course of business."]
[null,"     "]
[null,"With respect to all such matters, we record an accrual for a loss contingency when it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. In addition, narrative information is provided for matters as to which management believes a material loss is reasonably possible."]
[]
[null,"Management has assessed all such matters, including the matter described below, based on current information and made a judgment concerning their potential outcome, giving due consideration to the nature of the claim, the amount and nature of damages sought and the probability of success.  Management's judgment is made subject to the known uncertainty of litigation and management's judgment as to estimates made may prove materially different from actual results."]

{"sheet":"Summary_of_Significant_Account2","index":31,"n_rows":10,"n_cols":3,"rows_kept":10,"cut":false,"hidden":false,"merged":[[4,1,4,2],[0,0,1,0],[0,1,0,2],[1,1,1,2],[2,1,2,2],[3,0,9,0],[3,1,3,2]]}
["Summary of Significant Accounting Policies (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Accounting Policies [Abstract]"]
["Property, Plant and Equipment [Table Text Block]","Depreciation is computed for financial reporting purposes by the straight-line method for land improvements, building and leasehold improvements and by the declining-balance method for equipment, based on the estimated useful lives of the assets, as follows:"]
[]
[]
[null,"Land improvements","5 to 20 years"]
[null,"Buildings","5 to 20 years"]
[null,"Equipment","3 to 10 years"]
[null,"Leasehold improvements","Shorter of lease term or estimated useful life; ranging from 5-to-20 years"]

{"sheet":"Accounts_Receivable_Net_and_Su1","index":32,"n_rows":79,"n_cols":8,"rows_kept":79,"cut":false,"hidden":false,"merged":[[36,0,49,0],[50,0,67,0],[68,0,79,0],[78,7,79,7],[78,8,79,8],[0,0,1,0],[0,1,0,8],[1,1,1,8],[2,1,2,8],[3,0,20,0],[5,1,5,8],[6,1,6,8],[21,0,35,0],[78,1,79,1],[78,2,79,2],[78,3,79,3],[78,4,79,4],[78,5,79,5],[78,6,79,6],[76,1,77,1],[76,2,77,3],[76,4,77,4],[76,5,77,5],[76,6,77,7],[76,8,77,8],[72,7,73,7],[72,8,73,8],[74,1,75,1],[74,2,75,3],[74,4,75,4],[74,5,75,5],[74,6,75,7],[74,8,75,8],[72,1,73,1],[72,2,73,2],[72,3,73,3],[72,4,73,4],[72,5,73,5],[72,6,73,6],[66,7,67,7],[66,8,67,8],[68,1,68,8],[70,2,70,8],[71,2,71,4],[71,6,71,8],[66,1,67,1],[66,2,67,2],[66,3,67,3],[66,4,67,4],[66,5,67,5],[66,6,67,6],[64,1,65,1],[64,2,65,3],[64,4,65,4],[64,5,65,5],[64,6,65,7],[64,8,65,8],[62,1,63,1],[62,2,63,3],[62,4,63,4],[62,5,63,5],[62,6,63,7],[62,8,63,8],[60,1,61,1],[60,2,61,3],[60,4,61,4],[60,5,61,5],[60,6,61,7],[60,8,61,8],[58,1,59,1],[58,2,59,3],[58,4,59,4],[58,5,59,5],[58,6,59,7],[58,8,59,8],[54,7,55,7],[54,8,55,8],[56,1,57,1],[56,2,57,3],[56,4,57,4],[56,5,57,5],[56,6,57,7],[56,8,57,8],[54,1,55,1],[54,2,55,2],[54,3,55,3],[54,4,55,4],[54,5,55,5],[54,6,55,6],[48,7,49,7],[48,8,49,8],[50,1,50,8],[52,2,52,8],[53,2,53,4],[53,6,53,8],[48,1,49,1],[48,2,49,2],[48,3,49,3],[48,4,49,4],[48,5,49,5],[48,6,49,6],[46,1,47,1],[46,2,47,3],[46,4,47,4],[46,5,47,5],[46,6,47,7],[46,8,47,8],[44,1,45,1],[44,2,45,3],[44,4,45,4],[44,5,45,5],[44,6,45,7],[44,8,45,8],[40,7,41,7],[40,8,41,8],[42,1,43,1],[42,2,43,3],[42,4,43,4],[42,5,43,5],[42,6,43,7],[42,8,43,8],[40,1,41,1],[40,2,41,2],[40,3,41,3],[40,4,41,4],[40,5,41,5],[40,6,41,6],[34,7,35,7],[34,8,35,8],[36,1,36,8],[38,2,38,8],[39,2,39,4],[39,6,39,8],[34,1,35,1],[34,2,35,2],[34,3,35,3],[34,4,35,4],[34,5,35,5],[34,6,35,6],[32,1,33,1],[32,2,33,3],[32,4,33,4],[32,5,33,5],[32,6,33,7],[32,8,33,8],[30,1,31,1],[30,2,31,3],[30,4,31,4],[30,5,31,5],[30,6,31,7],[30,8,31,8],[26,7,27,7],[26,8,27,8],[28,1,29,1],[28,2,29,3],[28,4,29,4],[28,5,29,5],[28,6,29,7],[28,8,29,8],[26,1,27,1],[26,2,27,2],[26,3,27,3],[26,4,27,4],[26,5,27,5],[26,6,27,6],[19,7,20,7],[19,8,20,8],[22,1,22,8],[24,2,24,8],[25,2,25,4],[25,6,25,8],[21,1,21,8],[19,1,20,1],[19,2,20,2],[19,3,20,3],[19,4,20,4],[19,5,20,5],[19,6,20,6],[17,1,18,1],[17,2,18,3],[17,4,18,4],[17,5,18,5],[17,6,18,7],[17,8,18,8],[15,1,16,1],[15,2,16,3],[15,4,16,4],[15,5,16,5],[15,6,16,7],[15,8,16,8],[11,7,12,7],[11,8,12,8],[13,1,14,1],[13,2,14,3],[13,4,14,4],[13,5,14,5],[13,6,14,7],[13,8,14,8],[7,1,7,8],[9,2,9,8],[10,2,10,4],[10,6,10,8],[11,1,12,1],[11,2,12,2],[11,3,12,3],[11,4,12,4],[11,5,12,5],[11,6,12,6]]}
["Accounts Receivable, Net and Supplemental Balance Sheet Information (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Accounts Receivable, Net and Supplemental Balance Sheet Information [Abstract]"]
["Schedule of accounts receivable [Table Text Block]"]
[null,"E.","Accounts Receivable, Net and Supplemental Balance Sheet Information"]
[]
[null,"Accounts receivable, net, consisted of the following:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Accounts receivable","$",98657,null,null,"$",93156]
[]
[null,"Receivables under contractual arrangements",15362,null,null,null,14309]
[]
[null,null,114019,null,null,null,107465]
[]
[null,"Less allowances for doubtful accounts",2421,null,null,null,2209]
[]
[null,null,"$",111598,null,null,"$",105256]
[]
["Schedule of other current assets [Table Text Block]","The following items comprise the amounts included in the balance sheets:"]
[]
[]
[null,null,"December 31,"]
[null,"Other current assets",2014,null,null,null,2013]
[null,"Refundable income taxes","$",2122,null,null,"$",5317]
[]
[null,"Deferred income taxes",8927,null,null,null,7715]
[]
[null,"Note receivable",4319,null,null,null,"—"]
[]
[null,"Other",759,null,null,null,813]
[]
[null,"Total","$",16127,null,null,"$",13845]
[]
["Schedule of other assets, noncurrent [Table Text Block]"]
[]
[null,null,"December 31,"]
[null,"Other assets, noncurrent",2014,null,null,null,2013]
[null,"Assets invested for self-insurance","$",13684,null,null,"$",12716]
[]
[null,"Investment--cost-method affiliate",1168,null,null,null,1168]
[]
[null,"Deferred income taxes",1705,null,null,null,"—"]
[]
[null,"Other",2305,null,null,null,3033]
[]
[null,"Total","$",18862,null,null,"$",16917]
[]
["Schedule of accrued liabilities [Table Text Block]"]
[]
[null,null,"December 31,"]
[null,"Accrued expenses",2014,null,null,null,2013]
[null,"Employee compensation","$",19195,null,null,"$",18578]
[]
[null,"Accrued compensated absences",8034,null,null,null,6953]
[]
[null,"Self-insured medical claims",2722,null,null,null,2503]
[]
[null,"Customer advances, deposits",2030,null,null,null,2191]
[]
[null,"Taxes, other than income",2054,null,null,null,5730]
[]
[null,"Other",890,null,null,null,903]
[]
[null,"Total","$",34925,null,null,"$",36858]
[]
["Other liabilities, noncurrent [Table Text Block]"]
[]
[null,null,"December 31,"]
[null,"Other liabilities, noncurrent",2014,null,null,null,2013]
[null,"Pension and retirement plans","$",16311,null,null,"$",7760]
[]
[null,"Deferred income taxes","—",null,null,null,2564]
[]
[null,"Other",2657,null,null,null,1956]
[]
[null,"Total","$",18968,null,null,"$",12280]

{"sheet":"Supplemental_Operating_Informa1","index":33,"n_rows":9,"n_cols":13,"rows_kept":9,"cut":false,"hidden":false,"merged":[[3,1,3,12],[4,1,4,12],[6,2,6,12],[7,2,7,4],[7,6,7,8],[7,10,7,12],[0,0,1,0],[0,1,0,12],[1,1,1,12],[2,1,2,12],[3,0,8,0]]}
["Supplemental Operating Information (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Other Nonoperating Income (Expense) [Abstract]"]
["Schedule of Other Nonoperating Income (Expense) [Table Text Block]","Other nonoperating (expense) income, net, included in the statements of operations follows:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Other nonoperating expense, net","$","(3,050",")",null,"$","(2,827",")",null,"$","(2,611",")"]

{"sheet":"Supplemental_Cash_Flow_Informa1","index":34,"n_rows":36,"n_cols":13,"rows_kept":36,"cut":false,"hidden":false,"merged":[[0,0,1,0],[0,1,0,12],[1,1,1,12],[2,1,2,12],[3,0,36,0],[3,1,3,12],[35,7,36,7],[35,8,36,8],[35,9,36,9],[35,10,36,10],[35,11,36,11],[35,12,36,12],[35,1,36,1],[35,2,36,2],[35,3,36,3],[35,4,36,4],[35,5,36,5],[35,6,36,6],[32,9,33,9],[32,10,33,11],[32,12,33,12],[34,2,34,3],[34,6,34,7],[34,10,34,11],[32,1,33,1],[32,2,33,3],[32,4,33,4],[32,5,33,5],[32,6,33,7],[32,8,33,8],[28,12,29,12],[30,1,31,1],[30,2,31,3],[30,4,31,4],[30,5,31,5],[30,6,31,7],[30,8,31,8],[30,9,31,9],[30,10,31,11],[30,12,31,12],[26,10,27,11],[26,12,27,12],[28,1,29,1],[28,2,29,3],[28,4,29,4],[28,5,29,5],[28,6,29,7],[28,8,29,8],[28,9,29,9],[28,10,29,11],[24,9,25,9],[24,10,25,11],[24,12,25,12],[26,1,27,1],[26,2,27,3],[26,4,27,4],[26,5,27,5],[26,6,27,7],[26,8,27,8],[26,9,27,9],[22,8,23,8],[22,9,23,9],[22,10,23,11],[22,12,23,12],[24,1,25,1],[24,2,25,3],[24,4,25,4],[24,5,25,5],[24,6,25,7],[24,8,25,8],[20,8,21,8],[20,9,21,9],[20,10,21,10],[20,11,21,11],[20,12,21,12],[22,1,23,1],[22,2,23,3],[22,4,23,4],[22,5,23,5],[22,6,23,7],[18,9,19,9],[18,10,19,11],[18,12,19,12],[20,1,21,1],[20,2,21,2],[20,3,21,3],[20,4,21,4],[20,5,21,5],[20,6,21,6],[20,7,21,7],[16,8,17,8],[16,9,17,9],[16,10,17,11],[16,12,17,12],[18,1,19,1],[18,2,19,3],[18,4,19,4],[18,5,19,5],[18,6,19,7],[18,8,19,8],[14,8,15,8],[14,9,15,9],[14,10,15,10],[14,11,15,11],[14,12,15,12],[16,1,17,1],[16,2,17,3],[16,4,17,4],[16,5,17,5],[16,6,17,7],[12,9,13,9],[12,10,13,11],[12,12,13,12],[14,1,15,1],[14,2,15,2],[14,3,15,3],[14,4,15,4],[14,5,15,5],[14,6,15,6],[14,7,15,7],[12,1,13,1],[12,2,13,3],[12,4,13,4],[12,5,13,5],[12,6,13,7],[12,8,13,8],[8,12,9,12],[10,1,11,1],[10,2,11,3],[10,4,11,4],[10,5,11,5],[10,6,11,7],[10,8,11,8],[10,9,11,9],[10,10,11,11],[10,12,11,12],[8,6,9,6],[8,7,9,7],[8,8,9,8],[8,9,9,9],[8,10,9,10],[8,11,9,11],[4,1,4,12],[6,2,6,12],[7,2,7,4],[7,6,7,8],[7,10,7,12],[8,1,9,1],[8,2,9,2],[8,3,9,3],[8,4,9,4],[8,5,9,5]]}
["Supplemental Cash Flow Information (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Supplemental Cash Flow Information [Abstract]"]
["Supplemental Cash Flow Informations [Table Text Block]","Supplemental cash flow information follows: "]
[]
[]
[null,null,"Year Ended December 31,"]
[null,"Supplemental cash flow information",2014,null,null,null,2013,null,null,null,2012]
[null,"Interest paid","$",2948,null,null,"$",2732,null,null,"$",2683]
[]
[null,"Income taxes paid, net",13577,null,null,null,20133,null,null,null,11131]
[]
[null,"Noncash transactions:"]
[]
[null,"Debt issued for purchases of businesses","$",2080,null,null,"$",30,null,null,"$",100]
[]
[null,"Detail of acquisitions:"]
[]
[null,"Assets acquired:"]
[]
[null,"Receivables","$",1852,null,null,"$","—",null,null,"$",474]
[]
[null,"Operating supplies",61,null,null,null,"—",null,null,null,209]
[]
[null,"Prepaid expense",213,null,null,null,"—",null,null,null,47]
[]
[null,"Equipment",1726,null,null,null,"—",null,null,null,1826]
[]
[null,"Deposits and other",558,null,null,null,"—",null,null,null,"—"]
[]
[null,"Intangibles",8443,null,null,null,110,null,null,null,3812]
[]
[null,"Liabilities assumed","(1,078",null,")",null,"—",null,null,null,"(1,868",null,")"]
[]
[null,"Debt issued for purchases of businesses","(2,080",null,")",null,"(30",null,")",null,"(100",null,")"]
[null,"Cash paid","$",9695,null,null,"$",80,null,null,"$",4400]

{"sheet":"Identified_Intangible_Assets_a1","index":35,"n_rows":54,"n_cols":19,"rows_kept":54,"cut":false,"hidden":false,"merged":[[28,0,39,0],[28,1,28,19],[40,0,54,0],[40,1,40,19],[53,1,54,1],[53,2,54,2],[53,3,54,4],[53,5,54,5],[0,0,1,0],[0,1,0,19],[1,1,1,19],[2,1,2,19],[3,0,27,0],[3,1,3,19],[49,1,50,1],[49,2,50,2],[49,3,50,4],[49,5,50,5],[51,1,52,1],[51,2,52,2],[51,3,52,4],[51,5,52,5],[45,1,46,1],[45,2,46,2],[45,3,46,3],[45,4,46,4],[45,5,46,5],[47,1,48,1],[47,2,48,2],[47,3,48,4],[47,5,48,5],[38,13,39,13],[38,14,39,14],[38,15,39,15],[38,16,39,16],[41,1,41,5],[43,1,44,1],[43,2,44,2],[43,3,43,5],[44,3,44,5],[38,7,39,7],[38,8,39,8],[38,9,39,9],[38,10,39,10],[38,11,39,11],[38,12,39,12],[38,1,39,1],[38,2,39,2],[38,3,39,3],[38,4,39,4],[38,5,39,5],[38,6,39,6],[36,9,37,9],[36,10,37,11],[36,12,37,12],[36,13,37,13],[36,14,37,15],[36,16,37,16],[34,13,35,13],[34,14,35,14],[34,15,35,15],[34,16,35,16],[36,1,37,1],[36,2,37,3],[36,4,37,4],[36,5,37,5],[36,6,37,7],[36,8,37,8],[34,7,35,7],[34,8,35,8],[34,9,35,9],[34,10,35,10],[34,11,35,11],[34,12,35,12],[34,1,35,1],[34,2,35,2],[34,3,35,3],[34,4,35,4],[34,5,35,5],[34,6,35,6],[31,9,33,9],[31,10,31,12],[32,10,32,12],[33,10,33,12],[31,13,33,13],[31,14,31,16],[32,14,32,16],[33,14,33,16],[31,1,33,1],[31,2,31,4],[32,2,32,4],[33,2,33,4],[31,5,33,5],[31,6,33,8],[26,14,27,14],[26,15,27,15],[26,16,27,16],[26,17,27,18],[26,19,27,19],[29,1,29,16],[26,7,27,7],[26,8,27,8],[26,9,27,10],[26,11,27,11],[26,12,27,12],[26,13,27,13],[26,1,27,1],[26,2,27,2],[26,3,27,3],[26,4,27,4],[26,5,27,5],[26,6,27,6],[24,12,25,12],[24,13,25,14],[24,15,25,15],[24,16,25,16],[24,17,25,18],[24,19,25,19],[22,19,23,19],[24,1,25,1],[24,2,25,2],[24,3,25,3],[24,4,25,4],[24,5,25,6],[24,7,25,7],[24,8,25,8],[24,9,25,10],[24,11,25,11],[22,11,23,11],[22,12,23,12],[22,13,23,14],[22,15,23,15],[22,16,23,16],[22,17,23,18],[20,17,21,18],[20,19,21,19],[22,1,23,1],[22,2,23,2],[22,3,23,3],[22,4,23,4],[22,5,23,6],[22,7,23,7],[22,8,23,8],[22,9,23,10],[20,9,21,10],[20,11,21,11],[20,12,21,12],[20,13,21,14],[20,15,21,15],[20,16,21,16],[18,16,19,16],[18,17,19,18],[18,19,19,19],[20,1,21,1],[20,2,21,2],[20,3,21,3],[20,4,21,4],[20,5,21,6],[20,7,21,7],[20,8,21,8],[18,8,19,8],[18,9,19,10],[18,11,19,11],[18,12,19,12],[18,13,19,14],[18,15,19,15],[16,16,17,16],[16,17,17,17],[16,18,17,18],[16,19,17,19],[18,1,19,1],[18,2,19,2],[18,3,19,3],[18,4,19,4],[18,5,19,6],[18,7,19,7],[16,9,17,9],[16,10,17,10],[16,11,17,11],[16,12,17,12],[16,13,17,14],[16,15,17,15],[14,16,15,16],[14,17,15,18],[14,19,15,19],[16,1,17,1],[16,2,17,2],[16,3,17,3],[16,4,17,4],[16,5,17,6],[16,7,17,7],[16,8,17,8],[14,8,15,8],[14,9,15,10],[14,11,15,11],[14,12,15,12],[14,13,15,14],[14,15,15,15],[14,1,15,1],[14,2,15,2],[14,3,15,3],[14,4,15,4],[14,5,15,6],[14,7,15,7],[12,12,13,12],[12,13,13,14],[12,15,13,15],[12,16,13,16],[12,17,13,18],[12,19,13,19],[10,19,11,19],[12,1,13,1],[12,2,13,2],[12,3,13,3],[12,4,13,4],[12,5,13,6],[12,7,13,7],[12,8,13,8],[12,9,13,10],[12,11,13,11],[10,13,11,13],[10,14,11,14],[10,15,11,15],[10,16,11,16],[10,17,11,17],[10,18,11,18],[10,7,11,7],[10,8,11,8],[10,9,11,9],[10,10,11,10],[10,11,11,11],[10,12,11,12],[10,1,11,1],[10,2,11,2],[10,3,11,3],[10,4,11,4],[10,5,11,5],[10,6,11,6],[7,16,8,16],[7,17,7,19],[8,17,8,19],[9,5,9,7],[9,9,9,11],[9,13,9,15],[9,17,9,19],[7,8,8,8],[7,9,7,11],[8,9,8,11],[7,12,8,12],[7,13,7,15],[8,13,8,15],[4,1,4,19],[6,2,6,3],[7,2,7,3],[8,2,8,3],[6,5,6,11],[6,13,6,19],[7,1,8,1],[7,4,8,4],[7,5,7,7],[8,5,8,7]]}
["Identified Intangible Assets and Goodwill, Net (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Goodwill and Intangible Assets Disclosure [Abstract]"]
["Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]","The carrying amount of the identified intangibles and goodwill acquired in connection with our investments in businesses were as follows:"]
[]
[]
[null,null," Weighted-Average Amortization",null,null,"December 31, 2014",{"$nulls":7},"December 31, 2013"]
[null,null,"Period (Years)",null,null,"Carrying",null,null,null,"Accumulated",null,null,null,"Carrying",null,null,null,"Accumulated"]
[{"$nulls":5},"Amount",null,null,null,"Amortization",null,null,null,"Amount",null,null,null,"Amortization"]
[null,"Amortized intangible assets:"]
[null,"Customer lists/relationships",2.5,"years",null,"$",16076,null,null,"$",12560,null,null,"$",14429,null,null,"$",11398]
[]
[null,"Employment-related",2.8,"years",null,7026,null,null,null,5776,null,null,null,5631,null,null,null,5474]
[]
[null,"Tradenames",3.3,"years",null,5286,null,null,null,4153,null,null,null,4525,null,null,null,3754]
[]
[null,"Total",null,null,null,28388,null,null,null,"$",22489,null,null,24585,null,null,null,"$",20626]
[]
[null,"Less accumulated amortization",null,null,null,22489,{"$nulls":7},20626]
[]
[null,"Identified intangibles, net",null,null,null,5899,{"$nulls":7},3959]
[]
[null,"Unamortized intangible assets:"]
[]
[null,"Goodwill","Not amortized",null,null,28164,{"$nulls":7},23602]
[]
[{"$nulls":5},"$",34063,{"$nulls":6},"$",27561]
[]
["Schedule of Goodwill [Table Text Block]","The changes in the carrying amounts of goodwill, by segment, for the year ended December 31, 2014 follow:"]
[]
[]
[null,null,"Balance at",null,null,null,"Acquisitions",null,null,null,"Translation",null,null,null,"Balance at"]
[null,null,"January 1,",{"$nulls":7},"and Other",null,null,null,"December 31,"]
[null,null,2014,{"$nulls":7},"Adjustments",null,null,null,2014]
[null,"Utility","$",3064,null,null,"$",360,null,null,"$","—",null,null,"$",3424]
[]
[null,"Residential and Commercial",20538,null,null,null,4264,null,null,null,"(62",null,")",null,24740]
[]
[null,"Total","$",23602,null,null,"$",4624,null,null,"$","(62",")",null,"$",28164]
[]
["Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]","Estimated future aggregate amortization expense of intangible assets--The estimated aggregate amortization expense of intangible assets, as of December 31, 2014, in each of the next five years follows:"]
[]
[]
[null,null,null,"Estimated Future"]
[null,null,null,"Amortization Expense"]
[null,"Year ending December 31, 2015",null,"$",1876]
[]
[null,2016,null,1670]
[]
[null,2017,null,1210]
[]
[null,2018,null,473]
[]
[null,2019,null,338]

{"sheet":"ShortTerm_and_LongTerm_Debt_Ta","index":36,"n_rows":31,"n_cols":8,"rows_kept":31,"cut":false,"hidden":false,"merged":[[30,7,31,7],[30,8,31,8],[0,0,1,0],[0,1,0,8],[1,1,1,8],[2,1,2,8],[3,0,9,0],[3,1,3,8],[10,0,31,0],[10,1,10,8],[30,1,31,1],[30,2,31,2],[30,3,31,3],[30,4,31,4],[30,5,31,5],[30,6,31,6],[28,1,29,1],[28,2,29,3],[28,4,29,4],[28,5,29,5],[28,6,29,7],[28,8,29,8],[26,1,27,1],[26,2,27,3],[26,4,27,4],[26,5,27,5],[26,6,27,7],[26,8,27,8],[24,1,25,1],[24,2,25,3],[24,4,25,4],[24,5,25,5],[24,6,25,7],[24,8,25,8],[22,1,23,1],[22,2,23,3],[22,4,23,4],[22,5,23,5],[22,6,23,7],[22,8,23,8],[20,1,21,1],[20,2,21,3],[20,4,21,4],[20,5,21,5],[20,6,21,7],[20,8,21,8],[18,1,19,1],[18,2,19,3],[18,4,19,4],[18,5,19,5],[18,6,19,7],[18,8,19,8],[15,2,15,4],[15,6,15,8],[16,1,17,1],[16,2,17,2],[16,3,17,3],[16,4,17,4],[16,5,17,5],[16,6,17,6],[16,7,17,7],[16,8,17,8],[8,7,9,7],[8,8,9,8],[11,1,11,8],[13,2,13,8],[14,2,14,4],[14,6,14,8],[4,1,4,8],[6,2,6,8],[7,2,7,4],[7,6,7,8],[8,1,9,1],[8,2,9,2],[8,3,9,3],[8,4,9,4],[8,5,9,5],[8,6,9,6]]}
["Short-Term and Long-Term Debt (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Debt Disclosure [Abstract]"]
["Schedule of Short-term Debt [Table Text Block]","Short-term debt consisted of the following:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Current portion of long-term debt","$",8281,null,null,"$",8434]
[]
["Schedule of Long-term Debt Instruments [Table Text Block]","Long-term debt consisted of the following:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Revolving credit facility"]
[null,"Swing-line borrowings","$",7500,null,null,"$","—"]
[]
[null,"LIBOR borrowings",37000,null,null,null,20000]
[]
[null,null,44500,null,null,null,20000]
[]
[null,"Senior unsecured notes",30000,null,null,null,30000]
[]
[null,"Term loans",15087,null,null,null,8468]
[]
[null,null,89587,null,null,null,58468]
[]
[null,"Less current portion",8281,null,null,null,8434]
[]
[null,null,"$",81306,null,null,"$",50034]

{"sheet":"SelfInsurance_Accruals_Tables","index":37,"n_rows":38,"n_cols":9,"rows_kept":38,"cut":false,"hidden":false,"merged":[[24,0,37,0],[24,1,24,8],[35,7,36,7],[35,8,36,8],[37,2,37,3],[37,6,37,7],[0,0,1,0],[0,1,0,8],[1,1,1,8],[2,1,2,8],[3,0,23,0],[3,1,3,8],[35,1,36,1],[35,2,36,2],[35,3,36,3],[35,4,36,4],[35,5,36,5],[35,6,36,6],[33,1,34,1],[33,2,34,3],[33,4,34,4],[33,5,34,5],[33,6,34,7],[33,8,34,8],[29,7,30,7],[29,8,30,8],[31,1,32,1],[31,2,32,3],[31,4,32,4],[31,5,32,5],[31,6,32,7],[31,8,32,8],[29,1,30,1],[29,2,30,2],[29,3,30,3],[29,4,30,4],[29,5,30,5],[29,6,30,6],[22,7,23,7],[22,8,23,8],[25,1,25,8],[27,2,27,8],[28,2,28,4],[28,6,28,8],[22,1,23,1],[22,2,23,2],[22,3,23,3],[22,4,23,4],[22,5,23,5],[22,6,23,6],[20,1,21,1],[20,2,21,3],[20,4,21,4],[20,5,21,5],[20,6,21,7],[20,8,21,8],[18,1,19,1],[18,2,19,3],[18,4,19,4],[18,5,19,5],[18,6,19,7],[18,8,19,8],[16,1,17,1],[16,2,17,3],[16,4,17,4],[16,5,17,5],[16,6,17,7],[16,8,17,8],[14,1,15,1],[14,2,15,3],[14,4,15,4],[14,5,15,5],[14,6,15,7],[14,8,15,8],[12,1,13,1],[12,2,13,3],[12,4,13,4],[12,5,13,5],[12,6,13,7],[12,8,13,8],[8,7,9,7],[8,8,9,8],[10,1,11,1],[10,2,11,3],[10,4,11,4],[10,5,11,5],[10,6,11,7],[10,8,11,8],[4,1,4,8],[6,2,6,8],[7,2,7,4],[7,6,7,8],[8,1,9,1],[8,2,9,2],[8,3,9,3],[8,4,9,4],[8,5,9,5],[8,6,9,6]]}
["Self-Insurance Accruals (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Self-Insurance Accruals [Abstract]"]
["Schedule of Self-Insurance Accruals [Table Text Block]","Components of our self-insurance accruals for workers’ compensation, vehicle liability and general liability follow:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Workers' compensation","$",32982,null,null,"$",35199]
[]
[null,"Present value discount",1658,null,null,null,1796]
[]
[null,null,31324,null,null,null,33403]
[]
[null,"Vehicle liability",4940,null,null,null,4885]
[]
[null,"General liability",22629,null,null,null,18424]
[]
[null,"Total",58893,null,null,null,56712]
[]
[null,"Less current portion",23007,null,null,null,22057]
[]
[null,"Noncurrent portion","$",35886,null,null,"$",34655]
[]
["Schedule of Changes in Self-Insurance Accruals [Table Text Block]","The changes in our self-insurance accruals and the discount rate used for the workers’ compensation accrual are summarized in the table below."]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Balance, beginning of year","$",56712,null,null,"$",61733]
[]
[null,"Provision for claims",30340,null,null,null,27084]
[]
[null,"Payment of claims",28159,null,null,null,32105]
[]
[null,"Balance, end of year","$",58893,null,null,"$",56712]
[]
[null,"Workers' compensation discount rate",2,null,"%",null,2,null,"%"]

{"sheet":"Operating_Lease_Obligations_Ta","index":38,"n_rows":22,"n_cols":5,"rows_kept":22,"cut":false,"hidden":false,"merged":[[3,1,3,5],[21,1,22,1],[21,2,22,2],[21,3,22,3],[21,4,22,4],[21,5,22,5],[0,0,1,0],[0,1,0,5],[1,1,1,5],[2,1,2,5],[3,0,22,0],[17,1,18,1],[17,2,18,2],[17,3,18,4],[17,5,18,5],[19,1,20,1],[19,2,20,2],[19,3,20,4],[19,5,20,5],[13,1,14,1],[13,2,14,2],[13,3,14,4],[13,5,14,5],[15,1,16,1],[15,2,16,2],[15,3,16,4],[15,5,16,5],[9,1,10,1],[9,2,10,2],[9,3,10,3],[9,4,10,4],[9,5,10,5],[11,1,12,1],[11,2,12,2],[11,3,12,4],[11,5,12,5],[4,1,4,5],[6,1,7,1],[6,2,7,2],[6,3,6,5],[7,3,7,5],[8,3,8,5]]}
["Operating Lease Obligations (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Leases, Operating [Abstract]"]
["Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]","Minimum rental commitments under noncancelable operating leases, as of December 31, 2014 were as follows:"]
[]
[]
[null,"Minimum lease obligations",null,"Operating Lease"]
[null,null,null,"Obligations"]
[]
[null,"Year ending December 31, 2015",null,"$",5813]
[]
[null,2016,null,4470]
[]
[null,2017,null,2918]
[]
[null,2018,null,1764]
[]
[null,2019,null,868]
[]
[null,"2020 and after",null,1398]
[]
[null,"Total minimum lease payments",null,"$",17231]

{"sheet":"Common_Shares_and_Preferred_Sh1","index":39,"n_rows":19,"n_cols":7,"rows_kept":19,"cut":false,"hidden":false,"merged":[[0,0,1,0],[0,1,0,6],[1,1,1,6],[2,1,2,6],[3,0,19,0],[3,1,3,6],[18,1,19,1],[18,2,19,2],[18,3,19,3],[18,4,19,4],[18,5,19,5],[18,6,19,6],[15,1,16,1],[15,2,16,2],[15,3,16,3],[15,4,16,4],[15,5,16,5],[15,6,16,6],[13,1,14,1],[13,2,14,2],[13,3,14,3],[13,4,14,4],[13,5,14,5],[13,6,14,6],[11,1,12,1],[11,2,12,2],[11,3,12,3],[11,4,12,4],[11,5,12,5],[11,6,12,6],[4,1,4,6],[6,2,6,6],[7,2,7,3],[7,5,7,6],[8,1,9,1],[8,2,9,2],[8,3,9,3],[8,4,9,4],[8,5,9,5],[8,6,9,6]]}
["Common Shares and Preferred Shares (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Equity [Abstract]"]
["Schedule of Stock by Class [Table Text Block]","Common Shares Outstanding--The table below reconciles the activity of the common shares outstanding:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,2013]
[null,"Shares outstanding, beginning of year",13438611,null,null,13726002]
[]
[null,"Shares purchased","(727,436",")",null,"(931,078",")"]
[null,"Shares sold",287536,null,null,299330]
[]
[null,"Stock subscription offering, employee cash purchases",49940,null,null,25837]
[]
[null,"Options exercised",116282,null,null,318520]
[]
[null,null,"(273,678",")",null,"(287,391",")"]
[null,"Shares outstanding, end of year",13164933,null,null,13438611]

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["Accumulated Other Comprehensive Income (Loss) (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Equity [Abstract]"]
["Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]","The following summarizes the components of other comprehensive income (loss) accumulated in shareholders’ equity:"]
[]
[]
[null,null,null,"Foreign",null,null,null,"Interest",null,null,null,"Defined",null,null,null,"Accumulated"]
[null,null,null,"Currency",null,null,null,"Rate Cash",null,null,null,"Benefit",null,null,null,"Other"]
[null,null,null,"Translation",null,null,null,"Flow Hedges",null,null,null,"Pension",null,null,null,"Comprehensive"]
[null,null,null,"Adjustments",{"$nulls":7},"Plans",null,null,null,"Income/(Loss)"]
[null,"Balance at January 1, 2012",null,"$",2950,null,null,"$","(77",")",null,"$","(9,217",")",null,"$","(6,344",")"]
[]
[null,"Unrealized gains (losses)",null,561,null,null,null,"—",null,null,null,"—",null,null,null,561]
[]
[null,"Unrealized gains in fair value",null,"—",null,null,null,123,null,null,null,"—",null,null,null,123]
[]
[null,"Amounts reclassified from accumulated other comprehensive income (loss)",null,"—",null,null,null,"—",null,null,null,1268,null,null,null,1268]
[]
[null,"Tax effect",null,"—",null,null,null,"—",null,null,null,"(507",null,")",null,"(507",null,")"]
[]
[null,"Unrecognized amounts from defined benefit pension plans",null,"—",null,null,null,"—",null,null,null,"(3,712",null,")",null,"(3,712",null,")"]
[]
[null,"Tax effect",null,"—",null,null,null,"(46",null,")",null,1542,null,null,null,1496]
[]
[null,"Net of tax amount",null,561,null,null,null,77,null,null,null,"(1,409",null,")",null,"(771",null,")"]
[]
[null,"Balance at December 31, 2012",null,"$",3511,null,null,"$","—",null,null,"$","(10,626",")",null,"$","(7,115",")"]
[]
[null,"Unrealized gains (losses)",null,"(1,864",null,")",null,"—",null,null,null,"—",null,null,null,"(1,864",null,")"]
[]
[null,"Unrealized gains in fair value",null,"—",null,null,null,"—",null,null,null,"—",null,null,null,"—"]
[]
[null,"Amounts reclassified from accumulated other comprehensive income (loss)",null,"—",null,null,null,"—",null,null,null,1401,null,null,null,1401]
[]
[null,"Tax effect",null,"—",null,null,null,"—",null,null,null,"(532",null,")",null,"(532",null,")"]
[]
[null,"Unrecognized amounts from defined benefit pension plans",null,"—",null,null,null,"—",null,null,null,6306,null,null,null,6306]
[]
[null,"Tax effect",null,"—",null,null,null,"—",null,null,null,"(2,589",null,")",null,"(2,589",null,")"]
[]
[null,"Net of tax amount",null,"(1,864",null,")",null,"—",null,null,null,4586,null,null,null,2722]
[]
[null,"Balance at December 31, 2013",null,"$",1647,null,null,"$","—",null,null,"$","(6,040",")",null,"$","(4,393",")"]
[]
[null,"Unrealized gains (losses)",null,"(2,798",null,")",null,"—",null,null,null,"—",null,null,null,"(2,798",null,")"]
[]
[null,"Unrealized gains in fair value",null,"—",null,null,null,"—",null,null,null,"—",null,null,null,"—"]
[]
[null,"Amounts reclassified from accumulated other comprehensive income (loss)",null,"—",null,null,null,"—",null,null,null,2786,null,null,null,2786]
[]
[null,"Tax effect",null,"—",null,null,null,"—",null,null,null,"(1,095",null,")",null,"(1,095",null,")"]
[]
[null,"Unrecognized amounts from defined benefit pension plans",null,"—",null,null,null,"—",null,null,null,"(9,923",null,")",null,"(9,923",null,")"]
[]
[null,"Tax effect",null,"—",null,null,null,"—",null,null,null,3900,null,null,null,3900]
[]
[null,"Net of tax amount",null,"(2,798",null,")",null,"—",null,null,null,"(4,332",null,")",null,"(7,130",null,")"]
[]
[null,"Balance at December 31, 2014",null,"$","(1,151",")",null,"$","—",null,null,"$","(10,372",")",null,"$","(11,523",")"]

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["Stock-Based Compensation (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Disclosure of Compensation Related Costs, Share-based Payments [Abstract]"]
["Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]","Stock-based compensation expense under all share-based payment plans—our Employee Stock Purchase Plan, stock option plans, stock-settled stock appreciation rights, and performance-based restricted stock units—included in the results of operations follows:"]
[]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Compensation expense, all share-based payment plans","$",1860,null,null,"$",1411,null,null,"$",1508]
[]
[null,"Income tax benefit",549,null,null,null,348,null,null,null,383]
[]
["Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]","Purchases under the plan, at 85% of the fair market value of the common shares, have been as follows:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Number of employees participating",1684,null,null,null,1500,null,null,null,1157]
[]
[null,"Shares purchased during the year",115029,null,null,null,118444,null,null,null,136947]
[]
[null,"Weighted-average per share purchase price paid","$",23.07,null,null,"$",20.010000000000002,null,null,"$",17.2]
[]
[null,"Cumulative shares purchased since 1982",8751255,null,null,null,8636226,null,null,null,8517782]
[]
["Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block]","The following table summarizes the SSARs as of December 31, 2014: "]
[]
[]
[null,"Stock-Settled",null,"Number of",null,null,"Weighted-",null,null,null,"Weighted-",null,"Unrecognized",null,null,null,"Aggregate"]
[null,"Stock Appreciation Rights",null,"Rights",null,null,"Average Award Date Value",null,null,null,"Average",null,"Compensation Cost",null,null,null,"Intrinsic Value"]
[{"$nulls":10},"Remaining Contractual Life"]
[null,"Unvested, January 1, 2014",null,283453,null,null,"$",3.15]
[]
[null,"Granted",null,127050,null,null,4.88]
[]
[null,"Forfeited",null,"—",null,null,"—"]
[]
[null,"Vested",null,"(107,232",")",null,3.26]
[]
[null,"Unvested, December 31, 2014",null,303271,null,null,"$",3.84,null,null,"2.0 years",null,"$",865,null,null,"$",8431]
[]
[null,"Employee SSARs",null,286294,null,null,"$",3.92,null,null,"2.0 years",null,"$",838,null,null,"$",7959]
[]
[null,"Nonemployee Director SSARs",null,16977,null,null,"$",2.29,null,null,"1.8 years",null,"$",27,null,null,"$",472]
[]
["Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]","The following table summarizes "]
[null,"Performance-Based Restricted Stock Units as of December 31, 2014:"]
[]
[]
[null,"Performance-Based",null,"Number of",null,null,"Weighted-",null,null,null,"Weighted-",null,"Unrecognized",null,null,null,"Aggregate"]
[null,"Restricted Stock Units",null,"Stock Units",null,null,"Average",null,null,null,"Average",null,"Compensation",null,null,null,"Intrinsic"]
[{"$nulls":6},"Grant Date Value",null,null,null,"Remaining",null,"Cost",null,null,null,"Value"]
[{"$nulls":10},"Contractual Life"]
[null,"Unvested, January 1, 2014",null,95558,null,null,"$",19.03]
[]
[null,"Granted",null,39476,null,null,24.64]
[]
[null,"Forfeited",null,"—",null,null,"—"]
[]
[null,"Vested",null,"(17,325",")",null,17.48]
[]
[null,"Unvested, December 31, 2014",null,117709,null,null,"$",21.14,null,null,"2.7 years",null,"$",1456,null,null,"$",3272]
[]
[null,"Employee PRSUs",null,103139,null,null,"$",20.78,null,null,"2.9 years",null,"$",1236,null,null,"$",2867]
[]
[null,"Nonemployee Director PRSUs",null,14570,null,null,"$",23.61,null,null,"1.8 years",null,"$",220,null,null,"$",405]
[]
["Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]","The fair values of stock-based awards granted were estimated at the dates of grant with the following weighted-average assumptions:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,2013,null,null,2012]
[null,"Volatility rate",11.2,"%",null,11.3,"%",null,11.7,"%"]
[null,"Risk-free interest rate",2.6,"%",null,2.1,"%",null,1.6,"%"]
[null,"Expected dividend yield",1.1000000000000001,"%",null,1.5,"%",null,1.5,"%"]
[null,"Expected life of awards (years)",9.4,null,null,9.4,null,null,9.1]
[]
["Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]","The following table summarizes activity under the stock option plans for the year ended December 31, 2014:"]
[]
[]
[null,"Stock Options",null,"Number of",null,null,"Weighted-",null,null,null,"Weighted-",null,"Unrecognized",null,null,null,"Aggregate"]
[null,null,null,"Options",null,null,"Average",null,null,null,"Average",null,"Compensation",null,null,null,"Intrinsic"]
[null,null,null,"Outstanding",null,null,"Exercise",null,null,null,"Remaining",null,"Cost",null,null,null,"Value"]
[{"$nulls":6},"Price",null,null,null,"Contractual"]
[{"$nulls":10},"Life"]
[null,"Outstanding, January 1, 2014",null,662246,null,null,"$",16.68]
[]
[null,"Granted",null,183500,null,null,26.4]
[]
[null,"Exercised",null,"(74,715",")",null,13.11]
[]
[null,"Forfeited",null,"(900",")",null,24.98]
[]
[null,"Outstanding, December 31, 2014",null,770131,null,null,"$",19.329999999999998,null,null,"6.3 years",null,"$",1509,null,null,"$",6523]
[]
[null,"Exercisable, December 31, 2014",null,388851,null,null,"$",14.7,null,null,"3.9 years",{"$nulls":5},"$",5094]
[]
["Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]","Information regarding the stock options outstanding at December 31, 2014 is summarized below:"]
[]
[]
[null,"Stock Options",null,null,"Number",null,null,"Weighted-Average",null,"Weighted-",null,null,null,"Number",null,null,"Weighted-"]
[null," Exercise Price",null,null,"Outstanding",null,null,"Remaining",null,"Average",null,null,null,"Exercisable",null,null,"Average"]
[{"$nulls":7},"Contractual Life",null,"Exercise",{"$nulls":6},"Exercise"]
[{"$nulls":9},"Price",{"$nulls":6},"Price"]
[null,"Employee options:"]
[null,11.25,null,null,170047,null,null,"1.4 years",null,"$",11.25,null,null,170047,null,null,"$",11.25]
[]
[null,16,null,null,113234,null,null,"4.8 years",null,16,null,null,null,113234,null,null,16]
[]
[null,16.600000000000001,null,null,108900,null,null,"5.8 years",null,16.600000000000001,null,null,null,69420,null,null,16.600000000000001]
[]
[null,23.2,null,null,194950,null,null,"8.5 years",null,23.2,null,null,null,36150,null,null,23.2]
[]
[null,26.4,null,null,183000,null,null,"9.5 years",null,26.4,null,null,null,"—",null,null,26.4]
[]
[{"$nulls":4},770131,null,null,"6.3 years",null,"$",19.329999999999998,null,null,388851,null,null,"$",14.7]

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["Defined Benefit Pension Plans (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Compensation and Retirement Disclosure [Abstract]"]
["Schedule of Changes in Projected Benefit Obligations [Table Text Block]","The change in benefit obligations and the fair value of plans assets follows:"]
[]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Change in benefit obligation"]
[null,"Projected benefit obligation at beginning of year","$",31888,null,null,"$",36045]
[]
[null,"Service cost",51,null,null,null,222]
[]
[null,"Interest cost",1618,null,null,null,1515]
[]
[null,"Actuarial (gains)/losses",4838,null,null,null,"(4,272",null,")"]
[]
[null,"New longevity assumptions",3229,null,null,null,"—"]
[]
[null,"Settlements","(4,319",null,")",null,"—"]
[]
[null,"Benefits paid","(1,429",null,")",null,"(1,622",null,")"]
[null,"Projected benefit obligation at end of year","$",35876,null,null,"$",31888]
[]
[null,"Accumulated benefit obligation at end of year","$",35475,null,null,"$",31599]
[]
["Schedule of Changes in Fair Value of Plan Assets [Table Text Block]"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Change in fair value of plan assets"]
[null,"Fair value of plan assets at beginning of year","$",25754,null,null,"$",22957]
[]
[null,"Actual return on plan assets, net of expenses",136,null,null,null,3793]
[]
[null,"Employer contributions",1425,null,null,null,626]
[]
[null,"Settlements","(4,319",null,")",null,"—"]
[]
[null,"Benefits paid","(1,429",null,")",null,"(1,622",null,")"]
[null,"Fair value of plan assets at end of year","$",21567,null,null,"$",25754]
[]
["Schedule of Net Funded Status [Table Text Block]"]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Funded status of the plans"]
[null,"Fair value of plan assets","$",21567,null,null,"$",25754]
[]
[null,"Projected benefit obligation",35876,null,null,null,31888]
[]
[null,"Funded status of the plans","$","(14,309",")",null,"$","(6,134",")"]
["Schedule of Amounts Recognized in Balance Sheet [Table Text Block]"]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Amounts reported in the consolidated balance sheets"]
[null,"Current liability","$","(38",")",null,"$","(37",")"]
[null,"Noncurrent liability","(14,271",null,")",null,"(6,097",null,")"]
[null,"Funded status of the plans","$","(14,309",")",null,"$","(6,134",")"]
["Schedule of Amounts in Accumulated Other Comprehensive Income [Table Text Block]","Amounts included in accumulated other comprehensive income (loss), related to our defined benefit pension plans follow:"]
[]
[]
[null,null,"At December 31, 2014",{"$nulls":7},"At December 31, 2013"]
[null,null,"Pretax",null,null,null,"Net of Tax",null,null,null,"Pretax",null,null,null,"Net of Tax"]
[null,"Amounts reported in accumulated other comprehensive income"]
[null,"Unrecognized net actuarial loss","$",17093,null,null,"$",10339,null,null,"$",9942,null,null,"$",5995]
[]
[null,"Unrecognized prior service cost",55,null,null,null,33,null,null,null,69,null,null,null,45]
[]
[null,null,"$",17148,null,null,"$",10372,null,null,"$",10011,null,null,"$",6040]
[]
["Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]","The total amortization associated with these amounts that is expected to be recognized in net periodic benefit expense for 2015 follows: "]
{"$rows_empty":7}
[null,"P.","Defined Benefit Pension Plans (continued)"]
[]
[]
[null,null,"Year ending December 31, 2015"]
[null,null,"Pretax",null,null,null,"Net of Tax"]
[null,"Amortization of Costs Expected to be Recognized Next Year"]
[null,"Unrecognized net actuarial loss","$",1546,null,null,"$",928]
[]
[null,"Unrecognized prior service cost",14,null,null,null,8]
[]
[null,null,"$",1560,null,null,"$",936]
[]
["Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]","The aggregate projected benefit obligation, accumulated benefit obligation and fair value of plan assets for plans in which the fair value of plan assets is less than either the projected benefit obligation or accumulated benefit obligation follow: "]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"For pension plans with accumulated benefit obligations in excess of plan assets"]
[null,"Projected benefit obligation","$",35876,null,null,"$",31888]
[]
[null,"Accumulated benefit obligation",35475,null,null,null,31599]
[]
[null,"Fair value of plan assets",21567,null,null,null,25754]
[]
["Schedule of Assumptions Used [Table Text Block]","The actuarial assumptions follow. The discount rates were used to measure the year-end benefit obligation and compute pension expense for the subsequent year."]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,2013,null,null,2012]
[null,"Actuarial assumptions"]
[null,"Discount rate",4.3,"%",null,5.2,"%",null,4.25,"%"]
[null,"Expected long-term rate of return on plan assets",7.5,null,null,7.75,null,null,7.75]
[]
["Components of pension expense (income) [Table Text Block]","Net periodic benefit expense (income) associated with the defined benefit pension plans included the following components:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Components of pension expense (income)"]
[null,"Service costs--increase in benefit obligation earned","$",51,null,null,"$",222,null,null,"$",185]
[]
[null,"Interest cost on projected benefit obligation",1618,null,null,null,1515,null,null,null,1657]
[]
[null,"Expected return on plan assets","(1,993",null,")",null,"(1,760",null,")",null,"(1,701",null,")"]
[null,"Settlement loss",2065,null,null,null,"—",null,null,null,219]
[]
[null,"Amortization of net actuarial loss",708,null,null,null,1388,null,null,null,1041]
[]
[null,"Amortization of prior service cost",14,null,null,null,14,null,null,null,14]
[]
[null,"Net pension expense of defined benefit pension plans","$",2463,null,null,"$",1379,null,null,"$",1415]
[]
["Schedule of Allocation of Plan Assets [Table Text Block]","The fair values of our pension plan assets at December 31, 2014 by asset category, using the three-level hierarchy of fair value inputs, were as follows:  "]
[]
[]
[{"$nulls":7},"Fair Value Measurements at December 31, 2014 Using:"]
[null,"Description",null,"Total Carrying",null,null,null,"Quoted prices",null,null,null,"Significant",null,null,null,"Significant"]
[null,null,null,"Value at",null,null,null,"in",null,null,null,"other observable",null,null,null,"unobservable"]
[null,null,null,"2014-12-31",null,null,null,"active markets",null,null,null,"inputs",null,null,null,"inputs"]
[{"$nulls":7},"(Level 1)",null,null,null,"(Level 2)",null,null,null,"(Level 3)"]
[null,"Asset Category"]
[null,"Money market funds",null,"$",2442,null,null,"$","—",null,null,"$",2442,null,null,"$","—"]
[]
[null,"U.S. large-cap equities"]
[]
[null,"Growth",null,2625,null,null,null,2625,null,null,null,"—",null,null,null,"—"]
[]
[null,"Value",null,2088,null,null,null,2088,null,null,null,"—",null,null,null,"—"]
[]
[null,"U.S. small/mid-cap equities"]
[]
[null,"Growth",null,1623,null,null,null,1623,null,null,null,"—",null,null,null,"—"]
[]
[null,"Value",null,1844,null,null,null,1844,null,null,null,"—",null,null,null,"—"]
[]
[null,"International equities"]
[]
[null,"Growth",null,2128,null,null,null,2128,null,null,null,"—",null,null,null,"—"]
[]
[null,"Value",null,2124,null,null,null,2124,null,null,null,"—",null,null,null,"—"]
[]
[null,"Fixed income",null,3747,null,null,null,3747,null,null,null,"—",null,null,null,"—"]
[]
[null,"Multiclass world-allocation mutual funds",null,2946,null,null,null,2946,null,null,null,"—",null,null,null,"—"]
[]
[null,null,null,"$",21567,null,null,"$",19125,null,null,"$",2442,null,null,"$","—"]
[]
[]
[]
[null,"The fair values of our pension plan assets at December 31, 2013 by asset category, using the three-level hierarchy of fair value inputs, were as follows:"]
[]
[]
[null,"P.  ","Defined Benefit Pension Plans (continued)"]
[]
[]
[]
[{"$nulls":7},"Fair Value Measurements at December 31, 2013 Using:"]
[null,"Description",null,"Total Carrying",null,null,null,"Quoted prices",null,null,null,"Significant",null,null,null,"Significant"]
[null,null,null,"Value at",null,null,null,"in",null,null,null,"other observable",null,null,null,"unobservable"]
[null,null,null,"2013-12-31",null,null,null,"active markets",null,null,null,"inputs",null,null,null,"inputs"]
[{"$nulls":7},"(Level 1)",null,null,null,"(Level 2)",null,null,null,"(Level 3)"]
[null,"Asset Category"]
[null,"Money market funds",null,"$",1726,null,null,"$","—",null,null,"$",1726,null,null,"$","—"]
[]
[null,"U.S. large-cap equities"]
[]
[null,"Growth",null,3639,null,null,null,3639,null,null,null,"—",null,null,null,"—"]
[]
[null,"Value",null,2971,null,null,null,2971,null,null,null,"—",null,null,null,"—"]
[]
[null,"U.S. small/mid-cap equities"]
[]
[null,"Growth",null,1813,null,null,null,1813,null,null,null,"—",null,null,null,"—"]
[]
[null,"Value",null,1959,null,null,null,1959,null,null,null,"—",null,null,null,"—"]
[]
[null,"International equities"]
[]
[null,"Growth",null,2718,null,null,null,2718,null,null,null,"—",null,null,null,"—"]
[]
[null,"Value",null,2622,null,null,null,2622,null,null,null,"—",null,null,null,"—"]
[]
[null,"Fixed income",null,4423,null,null,null,4423,null,null,null,"—",null,null,null,"—"]
[]
[null,"Multiclass world-allocation mutual funds",null,3883,null,null,null,3883,null,null,null,"—",null,null,null,"—"]
[]
[null,null,null,"$",25754,null,null,"$",24028,null,null,"$",1726,null,null,"$","—"]
[]
["Schedule of Expected Benefit Payments [Table Text Block]","The benefits, as of December 31, 2014, expected to be paid to defined-benefit plan participants in each of the next five years, and in the aggregate for the five years thereafter, follow:"]
[]
[]
[null,null,null,"Participants Benefits"]
[null,"Estimated future payments"]
[null,"Year ending December 31, 2015",null,"$",1117]
[]
[null,2016,null,1268]
[]
[null,2017,null,1454]
[]
[null,2018,null,1529]
[]
[null,2019,null,1618]
[]
[null,"Years 2020 to 2024",null,9233]
[]
["Schedule of Multiemployer Plans [Table Text Block]"]
[]
[null,"Pension Fund",null,"EIN/Pension",null,"Pension",null,null,null,"FIB/RP",null,"Davey Tree",{"$nulls":11},"Surcharge",null,"Expiration"]
[null,null,null,"Plan Number",null,"Protection Act",null,null,null,"Status",null,"Contributions",{"$nulls":11},"Imposed",null,"Dates of"]
[{"$nulls":5},"Zone Status",null,null,null,"Pending",{"$nulls":15},"Bargaining"]
[{"$nulls":5},2014,null,2013,null,"Implemented",null,2014,null,null,null,2013,null,null,null,2012,{"$nulls":5},"Agreement"]
[null,"National Electric Benefit Fund",null,"53-0181657/001",null,"Green",null,"Green",null,"No",null,"$",743,null,null,"$",755,null,null,"$",417,null,null,"No",null,"Ranging from December 31, 2014 to "]
[{"$nulls":25},"2017-12-31"]
[null,"Eighth District Electrical Pension Fund",null,"84-6100393/001",null,"Green",null,"Green",null,"No",null,105,null,null,null,100,null,null,null,75,null,null,null,"No",null,"2017-12-31"]
[]
[{"$nulls":11},"$",848,null,null,"$",855,null,null,"$",492]

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[10,10,11,11],[10,12,11,12],[8,6,9,6],[8,7,9,7],[8,8,9,8],[8,9,9,9],[8,10,9,10],[8,11,9,11],[4,1,4,12],[6,2,6,12],[7,2,7,4],[7,6,7,8],[7,10,7,12],[8,1,9,1],[8,2,9,2],[8,3,9,3],[8,4,9,4],[8,5,9,5]]}
["Income Taxes (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Income Tax Disclosure [Abstract]"]
["Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]","Income before income taxes was attributable to the following sources:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"United States","$",30380,null,null,"$",29203,null,null,"$",35414]
[]
[null,"Canada",7920,null,null,null,6362,null,null,null,5244]
[]
[null,"Total","$",38300,null,null,"$",35565,null,null,"$",40658]
[]
["Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]","The provision for income taxes follows:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Currently payable:"]
[null,"Federal","$",13159,null,null,"$",7089,null,null,"$",15853]
[]
[null,"State",2524,null,null,null,2183,null,null,null,2239]
[]
[null,"Canadian",2127,null,null,null,1724,null,null,null,1578]
[]
[null,"Total current",17810,null,null,null,10996,null,null,null,19670]
[]
[null,"Deferred taxes","(2,679",null,")",null,1716,null,null,null,"(3,607",null,")"]
[]
[null,"Total taxes on income","$",15131,null,null,"$",12712,null,null,"$",16063]
[]
["Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]","A reconciliation of the expected statutory U.S. federal rate to our actual effective income tax rate follows:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,2013,null,null,2012]
[null,"Statutory U.S. federal tax rate",35,"%",null,35," %",null,35," %"]
[null,"State income taxes, net of federal benefit",3.9,null,null,3.6,null,null,3.9]
[]
[null,"Effect of Canadian income taxes","(1.7",")",null,"(1.6",")",null,"(1.0",")"]
[null,"Nondeductible expenses",1.9,null,null,1.9,null,null,1.4]
[]
[null,"ESOP dividend deduction","(.7",")",null,"(.8",")",null,"(.7",")"]
[null,"Audit settlements and uncertain tax adjustments",1.6,null,null,"(2.2",")",null,1.8]
[]
[null,"All other, net","(.5",")",null,"(.2",")",null,"(.9",")"]
[null,"Effective income tax rate",39.5,"%",null,35.700000000000003," %",null,39.5," %"]
["Schedule of Deferred Tax Assets and LIabilities, Current [Table Text Block]","Significant components of our current net deferred tax assets and liabilities at December 31, were as follows:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Deferred tax assets:"]
[null,"Accrued compensation obligations","$",3090,null,null,"$",1883]
[]
[null,"Self-insurance accruals",8107,null,null,null,7693]
[]
[null,"Prepaid expenses","(3,160",null,")",null,"(2,565",null,")"]
[null,"Other, net",1102,null,null,null,908]
[]
[null,null,9139,null,null,null,7919]
[]
[null,"Less deferred tax asset valuation allowance",212,null,null,null,204]
[]
[null,"Net deferred income tax assets--current","$",8927,null,null,"$",7715]
[]
["Deferred Tax Assets and Liabilities, Noncurrent [Table Text Block]","Significant components of our noncurrent net deferred tax assets and liabilities at December 31, were as follows:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Deferred tax assets:"]
[null,"Self-insurance accruals","$",12554,null,null,"$",12129]
[]
[null,"Accrued expenses and other liabilities",1388,null,null,null,895]
[]
[null,"Accrued stock compensation",1642,null,null,null,1550]
[]
[null,"Defined benefit pension plans",4573,null,null,null,1873]
[]
[null,"Foreign tax credit carryforward",768,null,null,null,768]
[]
[null,"Other future deductible amounts, net",2030,null,null,null,1737]
[]
[null,null,22955,null,null,null,18952]
[]
[null,"Less deferred tax asset valuation allowance",556,null,null,null,564]
[]
[null,null,22399,null,null,null,18388]
[]
[null,"Deferred tax liabilities:"]
[]
[null,"Intangibles",269,null,null,null,234]
[]
[null,"Property and equipment",20425,null,null,null,20718]
[]
[null,null,20694,null,null,null,20952]
[]
[null,"Net deferred tax assets--noncurrent","$",1705]
[]
[null,"Net deferred tax liabilities--noncurrent",{"$nulls":4},"$",2564]
[]
["Summary of Income Tax Contingencies [Table Text Block]","The balance of unrecognized benefits and the amount of related interest and penalties at December 31, were as follows:"]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013]
[null,"Unrecognized tax benefits","$",1949,null,null,"$",1221]
[]
[null,"Portion, if recognized, would reduce tax expense and effective tax rate",1512,null,null,null,942]
[]
[null,"Accrued interest on unrecognized tax benefits",77,null,null,null,41]
[]
[null,"Accrued penalties on unrecognized benefits","—",null,null,null,"—"]
[]
["Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]","The changes in our unrecognized tax benefits are summarized in the table below:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Balance, beginning of year","$",1221,null,null,"$",2638,null,null,"$",1825]
[]
[null,"Additions based on tax positions related to the current year",587,null,null,null,370,null,null,null,667]
[]
[null,"Additions for tax positions of prior years",234,null,null,null,133,null,null,null,149]
[]
[null,"Reductions for tax positions of prior years","(79",null,")",null,"(1,155",null,")",null,"(3",null,")"]
[null,"Reductions related to settlements with taxing authorities","—",null,null,null,"(460",null,")",null,"—"]
[]
[null,"Lapses in statutes of limitations","(14",null,")",null,"(305",null,")",null,"—"]
[]
[null,"Balance, end of year","$",1949,null,null,"$",1221,null,null,"$",2638]

{"sheet":"Earnings_Per_Share_Information1","index":44,"n_rows":38,"n_cols":12,"rows_kept":38,"cut":false,"hidden":false,"merged":[[0,0,1,0],[0,1,0,12],[1,1,1,12],[2,1,2,12],[3,0,38,0],[3,1,3,12],[37,7,38,7],[37,8,38,8],[37,9,38,9],[37,10,38,10],[37,11,38,11],[37,12,38,12],[37,1,38,1],[37,2,38,2],[37,3,38,3],[37,4,38,4],[37,5,38,5],[37,6,38,6],[35,7,36,7],[35,8,36,8],[35,9,36,9],[35,10,36,10],[35,11,36,11],[35,12,36,12],[35,1,36,1],[35,2,36,2],[35,3,36,3],[35,4,36,4],[35,5,36,5],[35,6,36,6],[31,12,32,12],[33,1,34,1],[33,2,34,3],[33,4,34,4],[33,5,34,5],[33,6,34,7],[33,8,34,8],[33,9,34,9],[33,10,34,11],[33,12,34,12],[29,10,30,11],[29,12,30,12],[31,1,32,1],[31,2,32,3],[31,4,32,4],[31,5,32,5],[31,6,32,7],[31,8,32,8],[31,9,32,9],[31,10,32,11],[27,9,28,9],[27,10,28,11],[27,12,28,12],[29,1,30,1],[29,2,30,3],[29,4,30,4],[29,5,30,5],[29,6,30,7],[29,8,30,8],[29,9,30,9],[27,1,28,1],[27,2,28,3],[27,4,28,4],[27,5,28,5],[27,6,28,7],[27,8,28,8],[23,12,24,12],[25,1,26,1],[25,2,26,3],[25,4,26,4],[25,5,26,5],[25,6,26,7],[25,8,26,8],[25,9,26,9],[25,10,26,11],[25,12,26,12],[21,10,22,11],[21,12,22,12],[23,1,24,1],[23,2,24,3],[23,4,24,4],[23,5,24,5],[23,6,24,7],[23,8,24,8],[23,9,24,9],[23,10,24,11],[19,9,20,9],[19,10,20,11],[19,12,20,12],[21,1,22,1],[21,2,22,3],[21,4,22,4],[21,5,22,5],[21,6,22,7],[21,8,22,8],[21,9,22,9],[19,1,20,1],[19,2,20,3],[19,4,20,4],[19,5,20,5],[19,6,20,7],[19,8,20,8],[15,12,16,12],[17,1,18,1],[17,2,18,3],[17,4,18,4],[17,5,18,5],[17,6,18,7],[17,8,18,8],[17,9,18,9],[17,10,18,11],[17,12,18,12],[13,10,14,11],[13,12,14,12],[15,1,16,1],[15,2,16,3],[15,4,16,4],[15,5,16,5],[15,6,16,7],[15,8,16,8],[15,9,16,9],[15,10,16,11],[11,9,12,9],[11,10,12,11],[11,12,12,12],[13,1,14,1],[13,2,14,3],[13,4,14,4],[13,5,14,5],[13,6,14,7],[13,8,14,8],[13,9,14,9],[11,1,12,1],[11,2,12,3],[11,4,12,4],[11,5,12,5],[11,6,12,7],[11,8,12,8],[9,7,10,7],[9,8,10,8],[9,9,10,9],[9,10,10,10],[9,11,10,11],[9,12,10,12],[9,1,10,1],[9,2,10,2],[9,3,10,3],[9,4,10,4],[9,5,10,5],[9,6,10,6],[4,1,4,12],[6,2,6,12],[7,2,7,4],[7,6,7,8],[7,10,7,12],[8,2,8,4],[8,6,8,8],[8,10,8,12]]}
["Earnings Per Share Information (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Earnings Per Share [Abstract]"]
["Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]","Earnings per share is computed as follows:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Income available to common shareholders:"]
[null,"Net income","$",23169,null,null,"$",22853,null,null,"$",24595]
[]
[null,"Weighted-average shares:"]
[]
[null,"Basic:"]
[]
[null,"Outstanding",13337198,null,null,null,13639356,null,null,null,13867771]
[]
[null,"Partially-paid share subscriptions",484025,null,null,null,531325,null,null,null,234595]
[]
[null,"Basic weighted-average shares",13821223,null,null,null,14170681,null,null,null,14102366]
[]
[null,"Diluted:"]
[]
[null,"Basic from above",13821223,null,null,null,14170681,null,null,null,14102366]
[]
[null,"Incremental shares from assumed:"]
[]
[null,"Exercise of stock subscription purchase rights",54824,null,null,null,34273,null,null,null,5750]
[]
[null,"Exercise of stock options and awards",362229,null,null,null,397478,null,null,null,500741]
[]
[null,"Diluted weighted-average shares",14238276,null,null,null,14602432,null,null,null,14608857]
[]
[null,"Share data:"]
[]
[null,"Earnings per share--basic","$",1.68,null,null,"$",1.61,null,null,"$",1.74]
[]
[null,"Earnings per share--diluted","$",1.63,null,null,"$",1.57,null,null,"$",1.68]

{"sheet":"Operations_by_Business_Segment1","index":45,"n_rows":101,"n_cols":21,"rows_kept":101,"cut":false,"hidden":false,"merged":[[79,0,101,0],[79,1,79,20],[0,0,1,0],[0,1,0,20],[1,1,1,20],[2,1,2,20],[3,0,78,0],[3,1,3,20],[100,7,101,7],[100,8,101,8],[100,9,101,9],[100,10,101,10],[100,11,101,11],[100,12,101,12],[98,8,99,8],[98,9,99,9],[98,10,99,11],[98,12,99,12],[100,1,101,1],[100,2,101,2],[100,3,101,3],[100,4,101,4],[100,5,101,5],[100,6,101,6],[96,8,97,8],[96,9,97,9],[96,10,97,10],[96,11,97,11],[96,12,97,12],[98,1,99,1],[98,2,99,3],[98,4,99,4],[98,5,99,5],[98,6,99,7],[94,9,95,9],[94,10,95,11],[94,12,95,12],[96,1,97,1],[96,2,97,2],[96,3,97,3],[96,4,97,4],[96,5,97,5],[96,6,97,6],[96,7,97,7],[94,1,95,1],[94,2,95,3],[94,4,95,4],[94,5,95,5],[94,6,95,7],[94,8,95,8],[91,2,91,4],[91,6,91,8],[91,10,91,12],[92,2,92,12],[93,2,93,4],[93,6,93,8],[93,10,93,12],[89,7,90,7],[89,8,90,8],[89,9,90,9],[89,10,90,10],[89,11,90,11],[89,12,90,12],[87,8,88,8],[87,9,88,9],[87,10,88,11],[87,12,88,12],[89,1,90,1],[89,2,90,2],[89,3,90,3],[89,4,90,4],[89,5,90,5],[89,6,90,6],[85,8,86,8],[85,9,86,9],[85,10,86,10],[85,11,86,11],[85,12,86,12],[87,1,88,1],[87,2,88,3],[87,4,88,4],[87,5,88,5],[87,6,88,7],[84,2,84,4],[84,6,84,8],[84,10,84,12],[85,1,86,1],[85,2,86,2],[85,3,86,3],[85,4,86,4],[85,5,86,5],[85,6,86,6],[85,7,86,7],[77,17,78,17],[77,18,78,19],[77,20,78,20],[80,1,80,12],[82,2,82,12],[83,2,83,4],[83,6,83,8],[83,10,83,12],[77,9,78,9],[77,10,78,11],[77,12,78,12],[77,13,78,13],[77,14,78,15],[77,16,78,16],[77,1,78,1],[77,2,78,3],[77,4,78,4],[77,5,78,5],[77,6,78,7],[77,8,78,8],[75,13,76,13],[75,14,76,15],[75,16,76,16],[75,17,76,17],[75,18,76,19],[75,20,76,20],[73,20,74,20],[75,1,76,1],[75,2,76,3],[75,4,76,4],[75,5,76,5],[75,6,76,7],[75,8,76,8],[75,9,76,9],[75,10,76,11],[75,12,76,12],[73,12,74,12],[73,13,74,13],[73,14,74,15],[73,16,74,16],[73,17,74,17],[73,18,74,19],[71,19,72,19],[71,20,72,20],[73,1,74,1],[73,2,74,3],[73,4,74,4],[73,5,74,5],[73,6,74,7],[73,8,74,8],[73,9,74,9],[73,10,74,11],[71,13,72,13],[71,14,72,14],[71,15,72,15],[71,16,72,16],[71,17,72,17],[71,18,72,18],[71,7,72,7],[71,8,72,8],[71,9,72,9],[71,10,72,10],[71,11,72,11],[71,12,72,12],[71,1,72,1],[71,2,72,2],[71,3,72,3],[71,4,72,4],[71,5,72,5],[71,6,72,6],[68,20,69,20],[70,2,70,4],[70,6,70,8],[70,10,70,12],[70,14,70,16],[70,18,70,20],[68,13,69,13],[68,14,69,15],[68,16,69,16],[68,17,69,17],[68,18,69,18],[68,19,69,19],[66,20,67,20],[68,1,69,1],[68,2,69,3],[68,4,69,4],[68,5,69,5],[68,6,69,7],[68,8,69,8],[68,9,69,9],[68,10,69,11],[68,12,69,12],[66,12,67,12],[66,13,67,13],[66,14,67,15],[66,16,67,16],[66,17,67,17],[66,18,67,19],[64,18,65,19],[64,20,65,20],[66,1,67,1],[66,2,67,3],[66,4,67,4],[66,5,67,5],[66,6,67,7],[66,8,67,8],[66,9,67,9],[66,10,67,11],[64,10,65,11],[64,12,65,12],[64,13,65,13],[64,14,65,15],[64,16,65,16],[64,17,65,17],[62,17,63,17],[62,18,63,19],[62,20,63,20],[64,1,65,1],[64,2,65,3],[64,4,65,4],[64,5,65,5],[64,6,65,7],[64,8,65,8],[64,9,65,9],[62,9,63,9],[62,10,63,11],[62,12,63,12],[62,13,63,13],[62,14,63,15],[62,16,63,16],[62,1,63,1],[62,2,63,3],[62,4,63,4],[62,5,63,5],[62,6,63,7],[62,8,63,8],[60,13,61,13],[60,14,61,15],[60,16,61,16],[60,17,61,17],[60,18,61,19],[60,20,61,20],[58,20,59,20],[60,1,61,1],[60,2,61,3],[60,4,61,4],[60,5,61,5],[60,6,61,7],[60,8,61,8],[60,9,61,9],[60,10,61,11],[60,12,61,12],[58,14,59,14],[58,15,59,15],[58,16,59,16],[58,17,59,17],[58,18,59,18],[58,19,59,19],[58,8,59,8],[58,9,59,9],[58,10,59,10],[58,11,59,11],[58,12,59,12],[58,13,59,13],[56,17,57,17],[56,18,57,19],[56,20,57,20],[58,1,59,1],[58,2,59,2],[58,3,59,3],[58,4,59,4],[58,5,59,5],[58,6,59,6],[58,7,59,7],[56,9,57,9],[56,10,57,11],[56,12,57,12],[56,13,57,13],[56,14,57,15],[56,16,57,16],[56,1,57,1],[56,2,57,3],[56,4,57,4],[56,5,57,5],[56,6,57,7],[56,8,57,8],[53,17,54,17],[53,18,54,19],[53,20,54,20],[55,2,55,4],[55,6,55,8],[55,10,55,12],[55,14,55,16],[55,18,55,20],[53,9,54,9],[53,10,54,11],[53,12,54,12],[53,13,54,13],[53,14,54,15],[53,16,54,16],[53,1,54,1],[53,2,54,3],[53,4,54,4],[53,5,54,5],[53,6,54,7],[53,8,54,8],[51,13,52,13],[51,14,52,15],[51,16,52,16],[51,17,52,17],[51,18,52,19],[51,20,52,20],[49,20,50,20],[51,1,52,1],[51,2,52,3],[51,4,52,4],[51,5,52,5],[51,6,52,7],[51,8,52,8],[51,9,52,9],[51,10,52,11],[51,12,52,12],[49,12,50,12],[49,13,50,13],[49,14,50,15],[49,16,50,16],[49,17,50,17],[49,18,50,19],[47,19,48,19],[47,20,48,20],[49,1,50,1],[49,2,50,3],[49,4,50,4],[49,5,50,5],[49,6,50,7],[49,8,50,8],[49,9,50,9],[49,10,50,11],[47,13,48,13],[47,14,48,14],[47,15,48,15],[47,16,48,16],[47,17,48,17],[47,18,48,18],[47,7,48,7],[47,8,48,8],[47,9,48,9],[47,10,48,10],[47,11,48,11],[47,12,48,12],[47,1,48,1],[47,2,48,2],[47,3,48,3],[47,4,48,4],[47,5,48,5],[47,6,48,6],[44,20,45,20],[46,2,46,4],[46,6,46,8],[46,10,46,12],[46,14,46,16],[46,18,46,20],[44,13,45,13],[44,14,45,15],[44,16,45,16],[44,17,45,17],[44,18,45,18],[44,19,45,19],[42,20,43,20],[44,1,45,1],[44,2,45,3],[44,4,45,4],[44,5,45,5],[44,6,45,7],[44,8,45,8],[44,9,45,9],[44,10,45,11],[44,12,45,12],[42,12,43,12],[42,13,43,13],[42,14,43,15],[42,16,43,16],[42,17,43,17],[42,18,43,19],[40,18,41,19],[40,20,41,20],[42,1,43,1],[42,2,43,3],[42,4,43,4],[42,5,43,5],[42,6,43,7],[42,8,43,8],[42,9,43,9],[42,10,43,11],[40,10,41,11],[40,12,41,12],[40,13,41,13],[40,14,41,15],[40,16,41,16],[40,17,41,17],[38,17,39,17],[38,18,39,19],[38,20,39,20],[40,1,41,1],[40,2,41,3],[40,4,41,4],[40,5,41,5],[40,6,41,7],[40,8,41,8],[40,9,41,9],[38,9,39,9],[38,10,39,11],[38,12,39,12],[38,13,39,13],[38,14,39,15],[38,16,39,16],[38,1,39,1],[38,2,39,3],[38,4,39,4],[38,5,39,5],[38,6,39,7],[38,8,39,8],[36,13,37,13],[36,14,37,15],[36,16,37,16],[36,17,37,17],[36,18,37,19],[36,20,37,20],[34,20,35,20],[36,1,37,1],[36,2,37,3],[36,4,37,4],[36,5,37,5],[36,6,37,7],[36,8,37,8],[36,9,37,9],[36,10,37,11],[36,12,37,12],[34,14,35,14],[34,15,35,15],[34,16,35,16],[34,17,35,17],[34,18,35,18],[34,19,35,19],[34,8,35,8],[34,9,35,9],[34,10,35,10],[34,11,35,11],[34,12,35,12],[34,13,35,13],[32,17,33,17],[32,18,33,19],[32,20,33,20],[34,1,35,1],[34,2,35,2],[34,3,35,3],[34,4,35,4],[34,5,35,5],[34,6,35,6],[34,7,35,7],[32,9,33,9],[32,10,33,11],[32,12,33,12],[32,13,33,13],[32,14,33,15],[32,16,33,16],[32,1,33,1],[32,2,33,3],[32,4,33,4],[32,5,33,5],[32,6,33,7],[32,8,33,8],[29,17,30,17],[29,18,30,19],[29,20,30,20],[31,2,31,4],[31,6,31,8],[31,10,31,12],[31,14,31,16],[31,18,31,20],[29,9,30,9],[29,10,30,11],[29,12,30,12],[29,13,30,13],[29,14,30,15],[29,16,30,16],[29,1,30,1],[29,2,30,3],[29,4,30,4],[29,5,30,5],[29,6,30,7],[29,8,30,8],[27,13,28,13],[27,14,28,15],[27,16,28,16],[27,17,28,17],[27,18,28,19],[27,20,28,20],[25,20,26,20],[27,1,28,1],[27,2,28,3],[27,4,28,4],[27,5,28,5],[27,6,28,7],[27,8,28,8],[27,9,28,9],[27,10,28,11],[27,12,28,12],[25,12,26,12],[25,13,26,13],[25,14,26,15],[25,16,26,16],[25,17,26,17],[25,18,26,19],[23,19,24,19],[23,20,24,20],[25,1,26,1],[25,2,26,3],[25,4,26,4],[25,5,26,5],[25,6,26,7],[25,8,26,8],[25,9,26,9],[25,10,26,11],[23,13,24,13],[23,14,24,14],[23,15,24,15],[23,16,24,16],[23,17,24,17],[23,18,24,18],[23,7,24,7],[23,8,24,8],[23,9,24,9],[23,10,24,10],[23,11,24,11],[23,12,24,12],[23,1,24,1],[23,2,24,2],[23,3,24,3],[23,4,24,4],[23,5,24,5],[23,6,24,6],[20,19,21,19],[20,20,21,20],[22,2,22,4],[22,6,22,8],[22,10,22,12],[22,14,22,16],[22,18,22,20],[20,12,21,12],[20,13,21,13],[20,14,21,15],[20,16,21,16],[20,17,21,17],[20,18,21,18],[18,18,19,19],[18,20,19,20],[20,1,21,1],[20,2,21,3],[20,4,21,4],[20,5,21,5],[20,6,21,7],[20,8,21,8],[20,9,21,9],[20,10,21,11],[18,10,19,11],[18,12,19,12],[18,13,19,13],[18,14,19,15],[18,16,19,16],[18,17,19,17],[16,17,17,17],[16,18,17,19],[16,20,17,20],[18,1,19,1],[18,2,19,3],[18,4,19,4],[18,5,19,5],[18,6,19,7],[18,8,19,8],[18,9,19,9],[16,9,17,9],[16,10,17,11],[16,12,17,12],[16,13,17,13],[16,14,17,15],[16,16,17,16],[16,1,17,1],[16,2,17,3],[16,4,17,4],[16,5,17,5],[16,6,17,7],[16,8,17,8],[14,13,15,13],[14,14,15,15],[14,16,15,16],[14,17,15,17],[14,18,15,19],[14,20,15,20],[12,20,13,20],[14,1,15,1],[14,2,15,3],[14,4,15,4],[14,5,15,5],[14,6,15,7],[14,8,15,8],[14,9,15,9],[14,10,15,11],[14,12,15,12],[12,12,13,12],[12,13,13,13],[12,14,13,15],[12,16,13,16],[12,17,13,17],[12,18,13,19],[10,19,11,19],[10,20,11,20],[12,1,13,1],[12,2,13,3],[12,4,13,4],[12,5,13,5],[12,6,13,7],[12,8,13,8],[12,9,13,9],[12,10,13,11],[10,13,11,13],[10,14,11,14],[10,15,11,15],[10,16,11,16],[10,17,11,17],[10,18,11,18],[10,7,11,7],[10,8,11,8],[10,9,11,9],[10,10,11,10],[10,11,11,11],[10,12,11,12],[10,1,11,1],[10,2,11,2],[10,3,11,3],[10,4,11,4],[10,5,11,5],[10,6,11,6],[6,17,8,17],[6,18,8,20],[9,2,9,4],[9,6,9,8],[9,10,9,12],[9,14,9,16],[9,18,9,20],[6,10,6,12],[7,10,7,12],[8,10,8,12],[6,13,8,13],[6,14,6,16],[7,14,7,16],[8,14,8,16],[4,1,4,20],[6,1,8,1],[6,2,6,4],[7,2,7,4],[8,2,8,4],[6,5,8,5],[6,6,6,8],[7,6,7,8],[8,6,8,8],[6,9,8,9]]}
["Operations by Business Segment and Geographic Information Operations by business segment (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Segment Reporting [Abstract]"]
["Schedule of Segment Reporting Information, by Segment [Table Text Block]","Information on reportable segments and reconciliation to the consolidated financial statements follows: "]
[]
[]
[null,null,"Utility",null,null,null,"Residential",null,null,null,"All",null,null,null," Reconciling",null,null,null,"Consolidated"]
[null,null,"Services",null,null,null,"Commercial",null,null,null,"Other",null,null,null," Adjustments"]
[{"$nulls":6},"Services"]
[null,"Fiscal Year 2014"]
[null,"Revenues","$",404519,null,null,"$",386274,null,null,"$","(882",")",null,"$","—",null,null,"$",789911]
[]
[null,"Income (loss) from operations",21382,null,null,null,37232,null,null,null,"(6,037",null,")",null,"(8,574",null,")","(a)",44003]
[]
[null,"Interest expense",{"$nulls":12},"(2,948",null,")",null,"(2,948",null,")"]
[]
[null,"Interest income",{"$nulls":12},295,null,null,null,295]
[]
[null,"Other income (expense), net",{"$nulls":12},"(3,050",null,")",null,"(3,050",null,")"]
[]
[null,"Income before income taxes",{"$nulls":16},"$",38300]
[]
[]
[null,"Depreciation","$",23225,null,null,"$",14544,null,null,"$","—",null,null,"$",3201,null,"(b)","$",40970]
[]
[null,"Amortization",174,null,null,null,1896,null,null,null,"—",null,null,null,"—",null,null,null,2070]
[]
[null,"Capital expenditures",25994,null,null,null,17490,null,null,null,"—",null,null,null,12247,null,null,null,55731]
[]
[null,"Segment assets, total",150002,null,null,null,144413,null,null,null,"—",null,null,null,86589,null,null,"(c)",381004]
[]
[]
[null,"Fiscal Year 2013"]
[]
[null,"Revenues","$",376520,null,null,"$",334878,null,null,"$",2450,null,null,"$","—",null,null,"$",713848]
[]
[null,"Income (loss) from operations",16070,null,null,null,33566,null,null,null,"(2,869",null,")",null,"(5,978",null,")","(a)",40789]
[]
[null,"Interest expense",{"$nulls":12},"(2,708",null,")",null,"(2,708",null,")"]
[]
[null,"Interest income",{"$nulls":12},311,null,null,null,311]
[]
[null,"Other income (expense), net",{"$nulls":12},"(2,827",null,")",null,"(2,827",null,")"]
[]
[null,"Income before income taxes",{"$nulls":16},"$",35565]
[]
[]
[null,"Depreciation","$",22261,null,null,"$",13286,null,null,"$","—",null,null,"$",2684,null,"(b)","$",38231]
[]
[null,"Amortization",359,null,null,null,1440,null,null,null,"—",null,null,null,181,null,null,null,1980]
[]
[null,"Capital expenditures",21642,null,null,null,17577,null,null,null,"—",null,null,null,5986,null,null,null,45205]
[]
[null,"Segment assets, total",145021,null,null,null,122542,null,null,null,"—",null,null,null,65815,null,null,"(c)",333378]
[]
[]
[null,"Fiscal Year 2012"]
[]
[null,"Revenues","$",375300,null,null,"$",303420,null,null,"$",1433,null,null,"$","—",null,null,"$",680153]
[]
[null,"Income (loss) from operations",20107,null,null,null,30787,null,null,null,"(1,366",null,")",null,"(3,761",null,")","(a)",45767]
[]
[null,"Interest expense",{"$nulls":12},"(2,698",null,")",null,"(2,698",null,")"]
[]
[null,"Interest income",{"$nulls":12},200,null,null,null,200]
[]
[null,"Other income (expense), net",{"$nulls":12},"(2,611",null,")",null,"(2,611",null,")"]
[]
[null,"Income before income taxes",{"$nulls":16},"$",40658]
[]
[]
[null,"Depreciation","$",22844,null,null,"$",12236,null,null,"$","—",null,null,"$",2285,null,"(b)","$",37365]
[]
[null,"Amortization",465,null,null,null,1058,null,null,null,"—",null,null,null,219,null,null,null,1742]
[]
[null,"Capital expenditures",15737,null,null,null,10266,null,null,null,"—",null,null,null,3731,null,null,null,29734]
[]
[null,"Segment assets, total",150294,null,null,null,122298,null,null,null,"—",null,null,null,58340,null,null,"(c)",330932]
[]
["Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]","Geographic Information--The following presents revenues and long-lived assets by geographic territory:"]
[]
[]
[null,null,"Year Ended December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Revenues"]
[null,"United States","$",706145,null,null,"$",637524,null,null,"$",607339]
[]
[null,"Canada",83766,null,null,null,76324,null,null,null,72814]
[]
[null,null,"$",789911,null,null,"$",713848,null,null,"$",680153]
[]
[]
[null,null,"December 31,"]
[null,null,2014,null,null,null,2013,null,null,null,2012]
[null,"Long-lived assets, net"]
[]
[null,"United States","$",196116,null,null,"$",166598,null,null,"$",153946]
[]
[null,"Canada",17692,null,null,null,14764,null,null,null,15237]
[]
[null,null,"$",213808,null,null,"$",181362,null,null,"$",169183]

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["Fair Value Measurements and Financial Instruments Fair Value Measurements and Financial Instruments (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"]
["Fair Value, Assets Measured on Recurring Basis [Table Text Block]","Our assets and liabilities measured at fair value on a recurring basis at December 31, 2014 and December 31, 2013, were as follows:"]
[]
[]
[{"$nulls":7},"Fair Value Measurements at"]
[{"$nulls":7},"December 31, 2014 Using:"]
[null,null,null,"Total",null,null,null,"Quoted prices in active markets",null,null,null,"Significant",null,null,null,"Significant"]
[null,null,null,"Carrying",{"$nulls":7},"other observable",null,null,null,"unobservable"]
[null,null,null,"Value at",{"$nulls":7},"inputs",null,null,null,"inputs"]
[null,"Description",null,"December 31, 2014",null,null,null,"(Level 1)",null,null,null,"(Level 2)",null,null,null,"(Level 3)"]
[null,"Assets:"]
[null,"Assets invested for self-insurance, classified as other assets, noncurrent",null,"$",13684,null,null,"$",13684,null,null,"$","—",null,null,"$","—"]
[]
[null,"Defined benefit pension plan assets",null,21567,null,null,null,19125,null,null,null,2442,null,null,null,"—"]
[]
[]
[null,"Liabilities:"]
[]
[null,"Deferred compensation",null,"$",1423,null,null,"$","—",null,null,"$",1423,null,null,"$","—"]
[]
[]
[]
[]
[]
[{"$nulls":7},"Fair Value Measurements at"]
[{"$nulls":7},"December 31, 2013 Using:"]
[null,null,null,"Total",null,null,null,"Quoted prices in active markets",null,null,null,"Significant",null,null,null,"Significant"]
[null,null,null,"Carrying",{"$nulls":7},"other observable",null,null,null,"unobservable"]
[null,null,null,"Value at",{"$nulls":7},"inputs",null,null,null,"inputs"]
[null,"Description",null,"December 31, 2013",null,null,null,"(Level 1)",null,null,null,"(Level 2)",null,null,null,"(Level 3)"]
[null,"Assets:"]
[null,"Assets invested for self-insurance, classified as other assets, noncurrent",null,"$",12716,null,null,"$",12716,null,null,"$","—",null,null,"$","—"]
[]
[null,"Defined benefit pension plan assets",null,25754,null,null,null,24028,null,null,null,1726,null,null,null,"—"]
[]
[]
[null,"Liabilities:"]
[]
[null,"Deferred compensation",null,"$",1144,null,null,"$","—",null,null,"$",1144,null,null,"$","—"]
[]
["Fair Value, by Balance Sheet Grouping [Table Text Block]","Financial instruments classified as noncurrent liabilities and their carrying values and fair values were as follows:"]
[]
[]
[null,null,"December 31, 2014",{"$nulls":7},"December 31, 2013"]
[null,null,"Carrying",null,null,null,"Fair",null,null,null,"Carrying",null,null,null,"Fair"]
[null,null,"Value",null,null,null,"Value",null,null,null,"Value",null,null,null,"Value"]
[null,"Revolving credit facility, noncurrent","$",44500,null,null,"$",44500,null,null,"$",20000,null,null,"$",20000]
[]
[null,"Senior unsecured notes",30000,null,null,null,30688,null,null,null,30000,null,null,null,28219]
[]
[null,"Term loans, noncurrent",6806,null,null,null,7195,null,null,null,34,null,null,null,34]
[]
[null,"Total","$",81306,null,null,"$",82383,null,null,"$",50034,null,null,"$",48253]
[]
["Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]"]

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["Quarterly Results of Operations Quarterly Results of Operations (Tables)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Quarterly Financial Information Disclosure [Abstract]"]
["Schedule of Quarterly Financial Information [Table Text Block]","The following is a summary of the results of operations for each quarter of 2014 and 2013. "]
[]
[]
[null,null,"Fiscal 2014, Three Months Ended"]
[null,null,"2015-03-29",null,null,null,"2015-06-29",null,null,null,"2015-09-27",null,null,null,"2015-12-31"]
[null,"Revenues","$",157387,null,null,"$",213183,null,null,"$",216604,null,null,"$",202737]
[]
[null,"Gross profit (revenues less costs and expenses, operating)",48156,null,null,null,82900,null,null,null,77613,null,null,null,72565]
[]
[null,"Income (loss) from operations","(4,725",null,")",null,23815,null,null,null,17144,null,null,null,7769]
[]
[null,"Net income (loss)","(6,180",null,")",null,14046,null,null,null,9657,null,null,null,5646]
[]
[]
[null,"Net income (loss) per share--Basic","$","(.29",")",null,"$",1.04,null,null,"$",0.72,null,null,"$",0.21]
[]
[null,"Net income (loss) per share -- Diluted:","$","(.29",")",null,"$",1.01,null,null,"$",0.69,null,null,"$",0.22]
[]
[]
[null,"ESOT Valuation per share","$",26.4,null,null,"$",26.4,null,null,"$",27.8,null,null,"$",30.1]
[]
[]
[]
[]
[null,null,"Fiscal 2013, Three Months Ended"]
[null,null,"2015-03-30",null,null,null,"2015-06-29",null,null,null,"2015-09-28",null,null,null,"2015-12-31"]
[null,"Revenues","$",143265,null,null,"$",195638,null,null,"$",194772,null,null,"$",180173]
[]
[null,"Gross profit (revenues less costs and expenses, operating)",42205,null,null,null,76046,null,null,null,69114,null,null,null,63837]
[]
[null,"Income (loss) from operations","(6,009",null,")",null,23230,null,null,null,14881,null,null,null,8687]
[]
[null,"Net income (loss)","(4,612",null,")",null,13436,null,null,null,8644,null,null,null,5385]
[]
[]
[null,"Net income (loss) per share -- Basic","$","(.33",")",null,"$",0.97,null,null,"$",0.63,null,null,"$",0.34]
[]
[null,"Net income (loss) per share -- Diluted","$","(.33",")",null,"$",0.94,null,null,"$",0.61,null,null,"$",0.35]
[]
[]
[null,"ESOT Valuation per share","$",23.2,null,null,"$",23.2,null,null,"$",23.9,null,null,"$",26.4]
[]
[]
[null,"Fourth quarters 2014 and 2013 include a decrease in casualty insurance expense that had the effect of increasing the fourth quarter gross profit for 2014 and 2013 by approximately $3,875 and $3,951, respectively."]

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["Our Business Reportable segments (Details)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Number of Reportable Segments",2]

{"sheet":"Summary_of_Significant_Account3","index":49,"n_rows":34,"n_cols":4,"rows_kept":34,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Summary of Significant Accounting Policies (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Property, Plant and Equipment [Line Items]"]
["Goodwill, Impairment Loss",0,0,0]
["Minimum [Member]"]
["Property, Plant and Equipment [Line Items]"]
["Intangible assets, estimated useful life","1 year"]
["Maximum [Member]"]
["Property, Plant and Equipment [Line Items]"]
["Intangible assets, estimated useful life","10 years"]
["Land improvements [Member] | Minimum [Member]"]
["Property, Plant and Equipment [Line Items]"]
["Property and equipment, estimated useful lives","P5Y"]
["Land improvements [Member] | Maximum [Member]"]
["Property, Plant and Equipment [Line Items]"]
["Property and equipment, estimated useful lives","P20Y"]
["Buildings [Member] | Minimum [Member]"]
["Property, Plant and Equipment [Line Items]"]
["Property and equipment, estimated useful lives","P5Y"]
["Buildings [Member] | Maximum [Member]"]
["Property, Plant and Equipment [Line Items]"]
["Property and equipment, estimated useful lives","P20Y"]
["Equipment [Member] | Minimum [Member]"]
["Property, Plant and Equipment [Line Items]"]
["Property and equipment, estimated useful lives","P3Y"]
["Equipment [Member] | Maximum [Member]"]
["Property, Plant and Equipment [Line Items]"]
["Property and equipment, estimated useful lives","P10Y"]
["Leasehold improvements [Member] | Minimum [Member]"]
["Property, Plant and Equipment [Line Items]"]
["Property and equipment, estimated useful lives","P5Y"]
["Leasehold improvements [Member] | Maximum [Member]"]
["Property, Plant and Equipment [Line Items]"]
["Property and equipment, estimated useful lives","P20Y"]

{"sheet":"Summary_of_Significant_Account4","index":50,"n_rows":5,"n_cols":4,"rows_kept":5,"cut":false,"hidden":false,"merged":[[0,0,2,0],[0,1,0,3]]}
["Summary of Significant Accounting Policies Concentration of Risk (Details)","12 Months Ended"]
[null,"Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
[null,"Rate","Rate","Rate"]
["Risks and Uncertainties [Abstract]"]
["Concentration Risk, Percentage",0.08,0.09,0.1]

{"sheet":"Business_Combinations_Details","index":51,"n_rows":8,"n_cols":4,"rows_kept":8,"cut":false,"hidden":false,"merged":[[0,0,1,0],[0,1,0,3]]}
["Business Combinations (Details) (USD $)","12 Months Ended"]
[null,"Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Business Acquisition [Line Items]"]
["Business combination, consideration transferred",12853000,110000,6368000]
["Business combination, recognized identifiable assets acquired and liabilities assumed, liabilities",1078000,0,1868000]
["Investments in businesses, debt issued",2080000,30000,100000]
["Goodwill, acquired during period",4624000,0,1820000]
["Excess of purchase price over the estimated fair value, tax deductible amount",4624000,0,258000]

{"sheet":"Accounts_Receivable_Net_and_Su2","index":52,"n_rows":33,"n_cols":3,"rows_kept":33,"cut":false,"hidden":false,"merged":[[0,1,1,1],[0,2,1,2]]}
["Accounts Receivable, Net and Supplemental Balance Sheet Information Accounts Receivable, Net and Supplemental Balance Sheet Information(Details) (USD $)","Dec. 31, 2014","Dec. 31, 2013"]
["In Thousands, unless otherwise specified"]
["Accounts receivable, net"]
["Accounts receivable",98657,93156]
["Receivables under contractual arrangements",15362,14309]
["Accounts receivable, gross, current",114019,107465]
["Less allowances for doubtful accounts",2421,2209]
["Accounts receivable, net",111598,105256]
["Other current assets"]
["Refundable income taxes",2122,5317]
["Deferred income taxes",8927,7715]
["Note receivable",4319,0]
["Other",759,813]
["Other current assets, total",16127,13845]
["Other assets, noncurrent"]
["Assets invested for self-insurance",13684,12716]
["Investment--cost-method affiliate",1168,1168]
["Deferred income taxes",1705,0]
["Other",2305,3033]
["Other assets, noncurrent, total",18862,16917]
["Accrued expenses"]
["Employee compensation",19195,18578]
["Accrued compensated absences",8034,6953]
["Self-insured medical claims",2722,2503]
["Customer advances, deposits",2030,2191]
["Taxes, other than income",2054,5730]
["Other",890,903]
["Accrued expenses, total",34925,36858]
["Other liabilities, noncurrent"]
["Pension and retirement plans",16311,7760]
["Deferred income taxes",0,2564]
["Other",2657,1956]
["Other liabilities, noncurrent, total",18968,12280]

{"sheet":"Supplemental_Operating_Informa2","index":53,"n_rows":5,"n_cols":4,"rows_kept":5,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Supplemental Operating Information (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Other Nonoperating Income (Expense) [Abstract]"]
["Other nonoperating expense, net",-3050,-2827,-2611]
["Foreign currency gain (loss)",-235,-146,11]

{"sheet":"Supplemental_Cash_Flow_Informa2","index":54,"n_rows":17,"n_cols":4,"rows_kept":17,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Supplemental Cash Flow Information (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Supplemental cash flow information"]
["Interest paid",2948,2732,2683]
["Income taxes paid, net",13577,20133,11131]
["Noncash transactions"]
["Debt issued for purchases of businesses",2080,30,100]
["Detail of acquisitions:"]
["Receivables",1852,0,474]
["Operating supplies",61,0,209]
["Prepaid expense",213,0,47]
["Equipment",1726,0,1826]
["Deposits and other",558,0,0]
["Intangibles",8443,110,3812]
["Liabilities assumed",1078,0,1868]
["Debt issued for purchases of businesses",-2080,-30,-100]
["Cash paid",9695,80,4400]

{"sheet":"Identified_Intangible_Assets_a2","index":55,"n_rows":23,"n_cols":3,"rows_kept":23,"cut":false,"hidden":false,"merged":[]}
["Identified Intangible Assets and Goodwill, Net (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013"]
["Acquired finite-lived intangible assets [line Items]"]
["Amortized intangible assets, carrying amount",28388,24585]
["Accumulated amortization",22489,20626]
["Identified intangibles, net",5899,3959]
["Goodwill",28164,23602]
["Intangible assets and goodwill net",34063,27561]
["Customer lists/relationships"]
["Acquired finite-lived intangible assets [line Items]"]
["Finite-lived intangible assets, remaining amortization period","2 years 6 months"]
["Finite-lived intangible assets, gross",16076,14429]
["Accumulated amortization",12560,11398]
["Employment-related"]
["Acquired finite-lived intangible assets [line Items]"]
["Finite-lived intangible assets, remaining amortization period","2 years 9 months 18 days"]
["Finite-lived intangible assets, gross",7026,5631]
["Accumulated amortization",5776,5474]
["Tradenames"]
["Acquired finite-lived intangible assets [line Items]"]
["Finite-lived intangible assets, remaining amortization period","3 years 3 months 18 days"]
["Finite-lived intangible assets, gross",5286,4525]
["Accumulated amortization",4153,3754]

{"sheet":"Identified_Intangible_Assets_a3","index":56,"n_rows":19,"n_cols":4,"rows_kept":19,"cut":false,"hidden":false,"merged":[[0,0,1,0],[0,1,0,3]]}
["Identified Intangible Assets and Goodwill, Net Schedule of Goodwill (Details) (USD $)","12 Months Ended"]
[null,"Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Goodwill [Roll Forward]"]
["Goodwill, balance at January 1, 2013",23602000]
["Goodwill, acquisitions",4624000,0,1820000]
["Goodwill, translation and other adjustments",-62000]
["Goodwill, balance at December 31, 2013",28164000,23602000]
["Utility"]
["Goodwill [Roll Forward]"]
["Goodwill, balance at January 1, 2013",3064000]
["Goodwill, acquisitions",360000]
["Goodwill, translation and other adjustments",0]
["Goodwill, balance at December 31, 2013",3424000]
["Residential and Commercial"]
["Goodwill [Roll Forward]"]
["Goodwill, balance at January 1, 2013",20538000]
["Goodwill, acquisitions",4264000]
["Goodwill, translation and other adjustments",-62000]
["Goodwill, balance at December 31, 2013",24740000]

{"sheet":"Identified_Intangible_Assets_a4","index":57,"n_rows":8,"n_cols":2,"rows_kept":8,"cut":false,"hidden":false,"merged":[[0,1,1,1]]}
["Identified Intangible Assets and Goodwill, Net (Future Amortization of Intangibles) (Details) (USD $)","Dec. 31, 2014"]
["In Thousands, unless otherwise specified"]
["Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]"]
["Year ending December 31, 2015",1876]
[2015,1670]
[2016,1210]
[2017,473]
[2018,338]

{"sheet":"ShortTerm_and_LongTerm_Debt_Sh","index":58,"n_rows":11,"n_cols":3,"rows_kept":11,"cut":false,"hidden":false,"merged":[]}
["Short-Term and Long-Term Debt Short-Term Debt (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013"]
["Short-term Debt [Abstract]"]
["Current portion of long-term debt",8281,8434]
["Line of credit facility, remaining borrowing capacity",7281]
["Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Line of credit [Member]"]
["Short-term Debt [Line Items]"]
["Debt instrument, basis spread on variable rate",7.4999999999999997E-3]
["Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Line of credit [Member]"]
["Short-term Debt [Line Items]"]
["Debt instrument, basis spread on variable rate",1.4999999999999999E-2]

{"sheet":"ShortTerm_and_LongTerm_Debt_Lo","index":59,"n_rows":15,"n_cols":4,"rows_kept":15,"cut":false,"hidden":false,"merged":[[0,1,1,1],[0,2,1,2],[0,3,1,3]]}
["Short-Term and Long-Term Debt Long-Term Debt (Details) (USD $)","Dec. 31, 2014","Dec. 31, 2013","Jul. 22, 2010"]
["In Thousands, unless otherwise specified"]
["Debt Instrument [Line Items]"]
["Revolving credit facility, noncurrent",44500,20000]
["Senior unsecured notes",30000,30000,30000]
["Term loans",15087,8468]
["Long-term debt",89587,58468]
["Less current portion",8281,8434]
["Long-term debt, excluding current maturities",81306,50034]
["Swing-line borrowings [Member]"]
["Debt Instrument [Line Items]"]
["Revolving credit facility, noncurrent",7500,0]
["LIBOR borrowings [Member]"]
["Debt Instrument [Line Items]"]
["Revolving credit facility, noncurrent",37000,20000]

{"sheet":"ShortTerm_and_LongTerm_Debt_Na","index":60,"n_rows":50,"n_cols":4,"rows_kept":50,"cut":false,"hidden":false,"merged":[]}
["Short-Term and Long-Term Debt Narrative (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Jul. 22, 2010"]
["Debt Instrument [Line Items]"]
["Senior unsecured notes, interest rate",5.0900000000000001E-2]
["Revolving credit facility, current borrowing capacity",175000]
["Letter of credit sublimit",100000]
["Swing line commitment",15000]
["Revolving credit facility, maximum borrowing capacity",210000]
["Senior unsecured notes",30000,30000,30000]
["Number of principal payments",5]
["Anniversary when principal payments begin",6]
["Unused commitments under credit facility",70964]
["Committed under credit facility",7281]
["Revolving credit facility borrowings",44500,20000]
["Letters of credit outstanding, amount",61540]
["Term loans, weighted average interest rate",3.0300000000000001E-2,2.0400000000000001E-2]
["Long-term Debt, Fiscal Year Maturity [Abstract]"]
[2014,8281]
[2015,7234]
[2016,6803]
[2017,6150]
[2018,6159]
["Minimum [Member]"]
["Debt Instrument [Line Items]"]
["Line of credit facility, commitment fee percentage",1E-3]
["Maximum [Member]"]
["Debt Instrument [Line Items]"]
["Line of credit facility, commitment fee percentage",2.5000000000000001E-3]
["Line of credit [Member]"]
["Debt Instrument [Line Items]"]
["Committed under credit facility",104036]
["Previous agreement [Member]"]
["Debt Instrument [Line Items]"]
["Revolving credit facility, current borrowing capacity",140000]
["Letter of credit sublimit",100000]
["Letter of credit [Member]"]
["Debt Instrument [Line Items]"]
["Letters of credit outstanding, amount",59536]
["Base rate [Member] | Line of credit [Member]"]
["Debt Instrument [Line Items]"]
["Debt instrument, variable rate, base rate calculation",5.0000000000000001E-3]
["London Interbank Offered Rate (LIBOR) [Member] | Line of credit [Member]"]
["Debt Instrument [Line Items]"]
["Debt instrument, variable rate, base rate calculation",1.4999999999999999E-2]
["London Interbank Offered Rate (LIBOR) [Member] | Line of credit [Member] | Minimum [Member]"]
["Debt Instrument [Line Items]"]
["Outstanding borrowings interest rate margin adjustment range",7.4999999999999997E-3]
["London Interbank Offered Rate (LIBOR) [Member] | Line of credit [Member] | Maximum [Member]"]
["Debt Instrument [Line Items]"]
["Outstanding borrowings interest rate margin adjustment range",1.4999999999999999E-2]

{"sheet":"SelfInsurance_Accruals_Details","index":61,"n_rows":18,"n_cols":3,"rows_kept":18,"cut":false,"hidden":false,"merged":[[0,1,0,2]]}
["Self-Insurance Accruals (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013"]
[null,"Rate","Rate"]
["Self-Insurance Accruals [Abstract]"]
["Workers' compensation",32982,35199]
["Present value discount",1658,1796]
["Workers' compensation, net of discount",31324,33403]
["Vehicle liability",4940,4885]
["General liability",22629,18424]
["Total",58893,56712]
["Less current portion",23007,22057]
["Noncurrent portion",35886,34655]
["Loss Contingency Accrual [Roll Forward]"]
["Balance, beginning of year",56712,61733]
["Provision for claims",30340,27084]
["Payment of claims",28159,32105]
["Balance, end of year",58893,56712]
["Workers' compensation discount rate",0.02,0.02]

{"sheet":"Operating_Lease_Obligations_De","index":62,"n_rows":13,"n_cols":4,"rows_kept":13,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Operating Lease Obligations (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Leases, Operating [Abstract]"]
["Operating leases, maximum lease terms","P5Y"]
["Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]"]
["Year ending December 31, 2015",5813]
[2016,4470]
[2017,2918]
[2018,1764]
[2019,868]
["2020 and after",1398]
["Total minimum lease payments",17231]
["Operating Leases, Rent Expense",6554,6167,5860]

{"sheet":"Common_Shares_and_Preferred_Sh2","index":63,"n_rows":36,"n_cols":4,"rows_kept":36,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Common Shares and Preferred Shares Common shares outstanding (Details) (USD $)","12 Months Ended"]
["In Thousands, except Share data, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Preferred shares"]
["Preferred stock, shares authorized",4000000]
["Preferred stock, par value",0]
["Preferred stock, shares issued",0]
["Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]"]
["Common stock, shares authorized",24000000,24000000]
["Common stock, par value",1,1]
["Common stock, shares issued",21456880,21456880,21456880]
["Treasury stock, shares",8291947,8018269,7730878]
["Common shares, direct sales",13061]
["Common shares, value, direct sales",346]
["Stock issued during period, shares, employee retirement plan",53857]
["Stock issued during period, value, employee retirement plan",1444]
["Common shares, employer matching contribution, shares",105589]
["Employee retirement plan, employer match",2922,2788,2643]
["Stock issued during period, shares, employee stock purchase plan",115029]
["Increase (Decrease) in Stockholders' Equity [Roll Forward]"]
["Shares outstanding, beginning of year",13438611,13726002]
["Shares purchased",-727436,-931078]
["Shares sold",287536,299330]
["Stock subscription offering, employee cash purchases",49940,25837]
["Options exercised",116282,318520]
["Increase/(decrease) in shares outstanding",-273678,-287391]
["Shares outstanding, end of year",13164933,13438611,13726002]
["Per Share Amounts and Common Shares Outstanding [Abstract]"]
["Share-based compensation arrangement by share-based payment award, options, exercisable, number",388851]
["Stock subscription offering, number of partially-paid subscriptions",476197]
["Stock subscription offering, number of rights outstanding",195029]
["Treasury stock [Member]"]
["Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]"]
["Shares purchased, value",19598,21887,18103]
["Increase (Decrease) in Stockholders' Equity [Roll Forward]"]
["Shares purchased",-727000,-931000,-892000]
["Shares sold",287000,299000,327000]

{"sheet":"Common_Shares_and_Preferred_Sh3","index":64,"n_rows":15,"n_cols":2,"rows_kept":15,"cut":false,"hidden":false,"merged":[[0,0,1,0]]}
["Common Shares and Preferred Shares Stock Subscription (Details) (USD $)","12 Months Ended"]
[null,"Dec. 31, 2014"]
["Stock subscription offering [Abstract]"]
["Stock subscription offering, subscription price",19.7]
["Stock subscription offering, number of shares subscribed",637714]
["stock subscription offering, value of shares subscribed",12563000]
["Stock subscription offering, minimum financed amount",5000]
["Stock subscription offering, down payment",0.1]
["Stock subscription offering, term","7 years"]
["Stock subscription offering interest rate",0.02]
["Stock subscription offering, minimum amount to receive right",5000]
["stock subscription offering, number of shares purchased to receive one right",3]
["Stock subscription offering, number of rights issued",211800]
["Stock subscription offering, portion exercisable per year",0.1429]
["Stock subscription offering, right expiration term","P7Y"]

{"sheet":"Accumulated_Other_Comprehensiv2","index":65,"n_rows":45,"n_cols":4,"rows_kept":45,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Accumulated Other Comprehensive Income (Loss) (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Increase (decrease) in accumulated other comprehensive income (loss) [Roll Forward]"]
["Balance at the beginning of the year",-4393,-7115,-6344]
["Unrealized gains (losses)",-2798,-1864,561]
["Unrealized gains in fair value",0,0,123]
["Amounts reclassified from accumulated other comprehensive income (loss)",2786,1401,1268]
["Tax effect",-1095,-532,-507]
["Unrecognized amounts from defined benefit pension plans",-9923,6306,-3712]
["Tax effect",3900,-2589,1496]
["Net of tax amount",-7130,2722,-771]
["Balance at the end of the year",-11523,-4393,-7115]
["Foreign Currency Translation Adjustments"]
["Increase (decrease) in accumulated other comprehensive income (loss) [Roll Forward]"]
["Balance at the beginning of the year",1647,3511,2950]
["Unrealized gains (losses)",-2798,-1864,561]
["Unrealized gains in fair value",0,0,0]
["Amounts reclassified from accumulated other comprehensive income (loss)",0,0,0]
["Tax effect",0,0,0]
["Unrecognized amounts from defined benefit pension plans",0,0,0]
["Tax effect",0,0,0]
["Net of tax amount",-2798,-1864,561]
["Balance at the end of the year",-1151,1647,3511]
["Interest Rate Cash Flow Hedges"]
["Increase (decrease) in accumulated other comprehensive income (loss) [Roll Forward]"]
["Balance at the beginning of the year",0,0,-77]
["Unrealized gains (losses)",0,0,0]
["Unrealized gains in fair value",0,0,123]
["Amounts reclassified from accumulated other comprehensive income (loss)",0,0,0]
["Tax effect",0,0,0]
["Unrecognized amounts from defined benefit pension plans",0,0,0]
["Tax effect",0,0,-46]
["Net of tax amount",0,0,77]
["Balance at the end of the year",0,0,0]
["Defined Benefit Pension Plans"]
["Increase (decrease) in accumulated other comprehensive income (loss) [Roll Forward]"]
["Balance at the beginning of the year",-6040,-10626,-9217]
["Unrealized gains (losses)",0,0,0]
["Unrealized gains in fair value",0,0,0]
["Amounts reclassified from accumulated other comprehensive income (loss)",2786,1401,1268]
["Tax effect",-1095,-532,-507]
["Unrecognized amounts from defined benefit pension plans",-9923,6306,-3712]
["Tax effect",3900,-2589,1542]
["Net of tax amount",-4332,4586,-1409]
["Balance at the end of the year",-10372,-6040,-10626]

{"sheet":"The_Davey_401KSOP_and_Employee1","index":66,"n_rows":24,"n_cols":4,"rows_kept":24,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["The Davey 401KSOP and Employee Stock Ownership Plan (Details) (USD $)","12 Months Ended"]
["In Thousands, except Share data, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]"]
["Employee stock ownership plan (ESOP), initial shares in ESOP",120000]
["Employee stock ownership plan (ESOP), shares adjusted for stock splits",11520000]
["Employee stock ownership plan (ESOP), initial value in ESOP",2700]
["Defined contribution plan, eligible age",21]
["Defined contribution plan, service requirement for eligibility","1 year"]
["Employee retirement plan, employer match",2922,2788,2643]
["First 1% [Member]"]
["Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]"]
["Defined contribution plan, employer matching contribution, percent",1]
["1% to 4% [Member]"]
["Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]"]
["Defined contribution plan, employer matching contribution, percent",0.5]
["Minimum [Member] | 1% to 4% [Member]"]
["Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]"]
["Defined contribution plan, employer matching contribution threshold, percent",0.01]
["Maximum [Member] | First 1% [Member]"]
["Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]"]
["Defined contribution plan, employer matching contribution threshold, percent",0.01]
["Maximum [Member] | 1% to 4% [Member]"]
["Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]"]
["Defined contribution plan, employer matching contribution threshold, percent",0.04]

{"sheet":"StockBased_Compensation_Detail","index":67,"n_rows":177,"n_cols":5,"rows_kept":177,"cut":false,"hidden":false,"merged":[[0,2,0,4]]}
["Stock-Based Compensation (Details) (USD $)","9 Months Ended","12 Months Ended"]
["In Thousands, except Share data, unless otherwise specified","Sep. 27, 2014","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Share-based Compensation Arrangement by Share-based Payment Award [Line Items]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum",0.1,0.05]
["Salaries, Wages and Officers' Compensation [Abstract]"]
["Compensation expense, all share-based payment plans",null,1860,1411,1508]
["Income tax benefit",null,549,348,383]
["Employee Stock Purchase Plan [Abstract]"]
["Shares purchased during the year",null,115029]
["Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]"]
["Volatility rate",null,0.112,0.113,0.11700000000000001]
["Risk-free interest rate",null,2.5999999999999999E-2,2.1000000000000001E-2,1.6E-2]
["Expected dividend yield",null,1.0999999999999999E-2,1.4999999999999999E-2,1.4999999999999999E-2]
["Expected life of awards (years)",null,"9 years 4 months 24 days","9 years 4 months 24 days","9 years 1 month 6 days"]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]"]
["Outstanding, beginning balance",662246,662246]
["Granted, Stock Options",null,183500]
["Exercised",null,-74715]
["Forfeited",null,900]
["Outstanding, ending balance",null,770131,662246]
["Exercisable, ending balance",null,388851]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price",null,14.7]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]"]
["Granted, weighted average exercise price",null,26.4]
["Exercised, weighted average exercise price",null,13.11]
["Forfeited, weighted average exercise price",null,24.98]
["Outstanding, weighted average exercise price, ending balance",null,19.329999999999998,16.68]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term",null,"6 years 3 months 4 days"]
["Exercisable, weighted average remaining contractual life (years)",null,"3 years 10 months 13 days"]
["Outstanding, unrecognized compensation cost",null,1509]
["Outstanding, aggregate intrinsic value",null,6523]
["Exercisable, aggregate intrinisic value",null,5094]
["Proceeds and Excess Tax Benefit from Share-based Compensation",null,354,242,402]
["Employee Stock Purchase Plan [Member]"]
["Employee Stock Purchase Plan [Abstract]"]
["Employee stock purchase, discount from market price, purchase date",null,0.15]
["Number of employees participating",null,1684,1500,1157]
["Shares purchased during the year",null,115029,118444,136947]
["Weighted-average per share purchase price paid",null,23.07,20.010000000000002,17.2]
["Cumulative shares purchased since 1982",null,8751255,8636226,8517782]
["Employee Stock Purchase Plan [Member]"]
["Salaries, Wages and Officers' Compensation [Abstract]"]
["Compensation expense, all share-based payment plans",null,463,417,415]
["Employee Stock Purchase Plan [Abstract]"]
["Employee stock purchase plan, service period",null,"1 year"]
["Employee stock purchase plan, percentage of market price, purchase date",null,0.85]
["Employee stock purchase, discount from market price, purchase date",null,0.15]
["Stock Options [Member]"]
["Share-based Compensation Arrangement by Share-based Payment Award [Line Items]"]
["Share-based compensation, vesting period",null,"10 years"]
["Salaries, Wages and Officers' Compensation [Abstract]"]
["Compensation expense, all share-based payment plans",null,398,234,166]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]"]
["Number outstanding",null,770131]
["Weighted average remaining contractual life (years)",null,null,"6 years 3 months 4 days"]
["Outstanding options, weighted average exercise price",null,19.329999999999998]
["Number exercisable",null,388851]
["Exercisable options, weighted average exercise price",null,14.7]
["Stock Options [Member] | $11.25 [Member]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]"]
["Lower range limit",null,11.25]
["Upper range limit",null,11.25]
["Number outstanding",null,170047]
["Weighted average remaining contractual life (years)",null,null,"1 year 5 months 5 days"]
["Outstanding options, weighted average exercise price",null,11.25]
["Number exercisable",null,170047]
["Exercisable options, weighted average exercise price",null,11.25]
["Stock Options [Member] | $16.00 [Member]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]"]
["Lower range limit",null,16]
["Upper range limit",null,16]
["Number outstanding",null,113234]
["Weighted average remaining contractual life (years)",null,null,"4 years 10 months 2 days"]
["Outstanding options, weighted average exercise price",null,16]
["Number exercisable",null,113234]
["Exercisable options, weighted average exercise price",null,16]
["Stock Options [Member] | $16.60 [Member]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]"]
["Lower range limit",null,16.600000000000001]
["Upper range limit",null,16.600000000000001]
["Number outstanding",null,108900]
["Weighted average remaining contractual life (years)",null,null,"5 years 10 months 2 days"]
["Outstanding options, weighted average exercise price",null,16.600000000000001]
["Number exercisable",null,69420]
["Exercisable options, weighted average exercise price",null,16.600000000000001]
["Stock Options [Member] | $23.20 [Member]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]"]
["Lower range limit",null,23.2]
["Upper range limit",null,23.2]
["Number outstanding",null,194950]
["Weighted average remaining contractual life (years)",null,null,"8 years 5 months 23 days"]
["Outstanding options, weighted average exercise price",null,23.2]
["Number exercisable",null,36150]
["Exercisable options, weighted average exercise price",null,23.2]
["Stock Options [Member] | $ 16.40 [Member]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]"]
["Number outstanding",null,183000]
["Weighted average remaining contractual life (years)",null,null,"9 years 6 months"]
["Number exercisable",null,0]
["Exercisable options, weighted average exercise price",null,26.4]
["Stock Appreciation Rights (SARs) [Member]"]
["Share-based Compensation Arrangement by Share-based Payment Award [Line Items]"]
["Share-based compensation, vesting period",null,"5 years"]
["Salaries, Wages and Officers' Compensation [Abstract]"]
["Compensation expense, all share-based payment plans",null,384,315,185]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]"]
["Unvested, beginning balance",283453,283453]
["Granted",null,127050]
["Forfeited",null,0]
["Vested",null,-107232]
["Unvested, ending balance",null,303271,283453]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]"]
["Unvested, weighted average award date value, beginning balance",3.15,3.15]
["Granted, weighted average award date value",null,4.88]
["Forfeited, weighted average award date value",null,0]
["Vested, weighted average award date value",null,3.26]
["Unvested, weighted average award date value, ending balance",null,3.84,3.15]
["Weighted average remaining contractual life (years)",null,"2 years"]
["Unrecognized compensation cost",null,865]
["Aggregate intrinsic value",null,8431]
["Employee SSARs [Member]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]"]
["Unvested, ending balance",null,286294]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]"]
["Unvested, weighted average award date value, ending balance",null,3.92]
["Weighted average remaining contractual life (years)",null,"2 years"]
["Unrecognized compensation cost",null,838]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested",null,7959]
["Nonemployee Director SSARs [Member]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]"]
["Unvested, ending balance",null,16977]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]"]
["Unvested, weighted average award date value, ending balance",null,2.29]
["Weighted average remaining contractual life (years)",null,"1 year 9 months 18 days"]
["Unrecognized compensation cost",null,27]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested",null,472]
["Restricted Stock Units (RSUs) [Member]"]
["Salaries, Wages and Officers' Compensation [Abstract]"]
["Compensation expense, all share-based payment plans",null,615,445,644]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]"]
["Unvested, beginning balance",95558,95558]
["Granted",null,39476]
["Forfeited",null,0]
["Vested",null,-17325]
["Unvested, ending balance",null,117709,95558]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]"]
["Unvested, weighted average award date value, beginning balance",19.03,19.03]
["Granted, weighted average award date value",null,24.64]
["Forfeited, weighted average award date value",null,0]
["Vested, weighted average award date value",null,17.48]
["Unvested, weighted average award date value, ending balance",null,21.14,19.03]
["Weighted average remaining contractual life (years)",null,"2 years 7 months 28 days"]
["Unrecognized compensation cost",null,1456]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested",null,3272]
["Employee PRSUs [Member]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]"]
["Unvested, ending balance",null,103139]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]"]
["Unvested, weighted average award date value, ending balance",null,20.78]
["Weighted average remaining contractual life (years)",null,"2 years 10 months 24 days"]
["Unrecognized compensation cost",null,1236]
["Aggregate intrinsic value",null,2867]
["Nonemployee Director PRSUs [Member]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]"]
["Unvested, ending balance",null,14570]
["Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]"]
["Unvested, weighted average award date value, ending balance",null,23.61]
["Weighted average remaining contractual life (years)",null,"1 year 9 months 18 days"]
["Unrecognized compensation cost",null,220]
["Aggregate intrinsic value",null,405]
["Director Stock Option [Member] | $ 16.40 [Member]"]
["Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]"]
["Lower range limit",null,16.399999999999999]
["Upper range limit",null,16.399999999999999]

{"sheet":"Defined_Benefit_Pension_Plans_1","index":68,"n_rows":12,"n_cols":4,"rows_kept":12,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Defined Benefit Pension Plans Change in benefit obligation (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]"]
["Projected benefit obligation at beginning of year",31888,36045]
["Service cost",51,222,185]
["Interest cost",1618,1515,1657]
["Actuarial (gains)/losses",4838,-4272]
["New longevity assumptions",3229,null,0]
["Settlements",-4319,0]
["Benefits paid",-1429,-1622]
["Projected benefit obligation at end of year",35876,31888,36045]
["Accumulated benefit obligation at end of year",35475,31599]

{"sheet":"Defined_Benefit_Pension_Plans_2","index":69,"n_rows":9,"n_cols":3,"rows_kept":9,"cut":false,"hidden":false,"merged":[[0,1,0,2]]}
["Defined Benefit Pension Plans Change in fair value of plan assets (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013"]
["Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]"]
["Fair value of plan assets at beginning of year",25754,22957]
["Actual return on plan assets, net of expenses",136,3793]
["Employer contributions",1425,626]
["Settlements",-4319,0]
["Benefits paid",-1429,-1622]
["Fair value of plan assets at end of year",21567,25754]

{"sheet":"Defined_Benefit_Pension_Plans_3","index":70,"n_rows":6,"n_cols":4,"rows_kept":6,"cut":false,"hidden":false,"merged":[[0,1,1,1],[0,2,1,2],[0,3,1,3]]}
["Defined Benefit Pension Plans Funded status of the plans (Details) (USD $)","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["In Thousands, unless otherwise specified"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",21567,25754,22957]
["Projected benefit obligation",35876,31888,36045]
["Funded status of the plans",-14309,-6134]

{"sheet":"Defined_Benefit_Pension_Plans_4","index":71,"n_rows":6,"n_cols":3,"rows_kept":6,"cut":false,"hidden":false,"merged":[[0,1,1,1],[0,2,1,2]]}
["Defined Benefit Pension Plans Amounts reported in the consolidated balance sheets (Details) (USD $)","Dec. 31, 2014","Dec. 31, 2013"]
["In Thousands, unless otherwise specified"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Current liability",-38,-37]
["Noncurrent liability",-14271,-6097]
["Funded status of the plans",-14309,-6134]

{"sheet":"Defined_Benefit_Pension_Plans_5","index":72,"n_rows":20,"n_cols":4,"rows_kept":20,"cut":false,"hidden":false,"merged":[[0,1,0,2]]}
["Defined Benefit Pension Plans Amounts reported in accumulated other comprehensive income (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Amounts reported in accumulated other comprehensive income"]
["Unrecognized net actuarial loss, Pretax",17093,9942]
["Unrecognized net actuarial loss, net of tax",10339,5995]
["Unrecognized prior service cost, pretax",55,69]
["Unrecognized prior service cost, net of tax",33,45]
["Amounts reported in accumulated other comprehensive income, pretax",17148,10011]
["Amounts reported in accumulated other comprehensive income, net of tax",10372,6040]
["Amortization of Costs Expected to be Recognized Next Year"]
["Unrecognized net actuarial loss, pretax",1546]
["Unrecognized net actuarial loss, net of tax",null,928]
["Unrecognized prior service cost, pretax",14]
["Unrecognized prior service cost, net of tax",null,8]
["Amortiztion of costs expected to be recognized next year, pretax",1560]
["Amortization of costs expected to be recognized next year, net of tax",null,936]
["For pension plans with accumulated benefit obligations in excess of plan assets"]
["Projected benefit obligation",35876,31888,36045]
["Accumulated benefit obligation",35475,31599]
["Fair value of plan assets",21567,25754,22957]

{"sheet":"Defined_Benefit_Pension_Plans_6","index":73,"n_rows":24,"n_cols":4,"rows_kept":24,"cut":false,"hidden":false,"merged":[[0,0,2,0],[0,1,0,3]]}
["Defined Benefit Pension Plans Actuarial Assumptions (Details)","12 Months Ended"]
[null,"Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
[null,"Rate","Rate","Rate"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Discount rate",4.2999999999999997E-2,5.1999999999999998E-2,4.2500000000000003E-2]
["Expected long-term rate of return on plan assets",7.4999999999999997E-2,7.7499999999999999E-2,7.7499999999999999E-2]
["Equity Securities [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Defined benefit plan, target plan asset allocations range minimum",0.55000000000000004]
["Defined benefit plan, target plan asset allocations range maximum",0.65]
["Fixed Income and Cash [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Defined benefit plan, target plan asset allocations range minimum",0.2]
["Defined benefit plan, target plan asset allocations range maximum",0.3]
["Alternative Investments [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Defined benefit plan, target plan asset allocations range minimum",0]
["Defined benefit plan, target plan asset allocations range maximum",0.15]
["Minimum [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Defined Benefit Plan, Risk Management Practices, Investment Evaluation Period","3 years"]
["Maximum [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Defined Benefit Plan, Risk Management Practices, Investment Evaluation Period","5 years"]

{"sheet":"Defined_Benefit_Pension_Plans_7","index":74,"n_rows":10,"n_cols":4,"rows_kept":10,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Defined Benefit Pension Plans Components of Pension Expense (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]"]
["Service costs--increase in benefit obligation earned",51,222,185]
["Interest cost on projected benefit obligation",1618,1515,1657]
["Expected return on plan assets",-1993,-1760,-1701]
["Settlement loss",2065,0,219]
["Amortization of net actuarial loss",708,1388,1041]
["Amortization of prior service cost",14,14,14]
["Net pension expense of defined benefit pension plans",2463,1379,1415]

{"sheet":"Defined_Benefit_Pension_Plans_8","index":75,"n_rows":122,"n_cols":4,"rows_kept":122,"cut":false,"hidden":false,"merged":[[0,1,1,1],[0,2,1,2],[0,3,1,3]]}
["Defined Benefit Pension Plans Fair Value of Plan Assets (Details) (USD $)","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["In Thousands, unless otherwise specified"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Total Carrying Value at December 31, 2014",21567,25754]
["Fair value of plan assets",21567,25754,22957]
["Fair Value, Inputs, Level 1 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",19125,24028]
["Fair Value, Inputs, Level 2 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",2442,1726]
["Fair Value, Inputs, Level 3 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["Money market funds"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Total Carrying Value at December 31, 2014",2442,1726]
["Money market funds | Fair Value, Inputs, Level 1 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["Money market funds | Fair Value, Inputs, Level 2 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",2442,1726]
["Money market funds | Fair Value, Inputs, Level 3 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["U.S. large-cap equities, growth [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Total Carrying Value at December 31, 2014",2625,3639]
["U.S. large-cap equities, growth [Member] | Fair Value, Inputs, Level 1 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",2625,3639]
["U.S. large-cap equities, growth [Member] | Fair Value, Inputs, Level 2 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["U.S. large-cap equities, growth [Member] | Fair Value, Inputs, Level 3 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["U.S. large-cap equities, value [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Total Carrying Value at December 31, 2014",2088,2971]
["U.S. large-cap equities, value [Member] | Fair Value, Inputs, Level 1 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",2088,2971]
["U.S. large-cap equities, value [Member] | Fair Value, Inputs, Level 2 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["U.S. large-cap equities, value [Member] | Fair Value, Inputs, Level 3 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["U.S. small/mid-cap equities, growth [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Total Carrying Value at December 31, 2014",1623,1813]
["U.S. small/mid-cap equities, growth [Member] | Fair Value, Inputs, Level 1 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",1623,1813]
["U.S. small/mid-cap equities, growth [Member] | Fair Value, Inputs, Level 2 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["U.S. small/mid-cap equities, growth [Member] | Fair Value, Inputs, Level 3 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["U.S. small/mid-cap equities, value [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Total Carrying Value at December 31, 2014",1844,1959]
["U.S. small/mid-cap equities, value [Member] | Fair Value, Inputs, Level 1 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",1844,1959]
["U.S. small/mid-cap equities, value [Member] | Fair Value, Inputs, Level 2 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["U.S. small/mid-cap equities, value [Member] | Fair Value, Inputs, Level 3 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["International equities, growth [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Total Carrying Value at December 31, 2014",2128,2718]
["International equities, growth [Member] | Fair Value, Inputs, Level 1 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",2128,2718]
["International equities, growth [Member] | Fair Value, Inputs, Level 2 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["International equities, growth [Member] | Fair Value, Inputs, Level 3 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["International equities, value [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Total Carrying Value at December 31, 2014",2124,2622]
["International equities, value [Member] | Fair Value, Inputs, Level 1 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",2124,2622]
["International equities, value [Member] | Fair Value, Inputs, Level 2 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["International equities, value [Member] | Fair Value, Inputs, Level 3 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["Fixed income"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Total Carrying Value at December 31, 2014",3747,4423]
["Fixed income | Fair Value, Inputs, Level 1 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",3747,4423]
["Fixed income | Fair Value, Inputs, Level 2 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["Fixed income | Fair Value, Inputs, Level 3 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["Multiclass world-allocation mutual funds"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Total Carrying Value at December 31, 2014",2946,3883]
["Multiclass world-allocation mutual funds | Fair Value, Inputs, Level 1 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",2946,3883]
["Multiclass world-allocation mutual funds | Fair Value, Inputs, Level 2 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]
["Multiclass world-allocation mutual funds | Fair Value, Inputs, Level 3 [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Fair value of plan assets",0,0]

{"sheet":"Defined_Benefit_Pension_Plans_9","index":76,"n_rows":12,"n_cols":2,"rows_kept":12,"cut":false,"hidden":false,"merged":[]}
["Defined Benefit Pension Plans Expected Benefits (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Year ending December 31, 2015",1117]
[2016,1268]
[2017,1454]
[2018,1529]
[2019,1618]
["Years 2020 to 2024",9233]
["Pension Plans, Defined Benefit [Member]"]
["Defined Benefit Plan Disclosure [Line Items]"]
["Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year",1038]

{"sheet":"Recovered_Sheet1","index":77,"n_rows":12,"n_cols":4,"rows_kept":12,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Defined Benefit Pension Plans Multiemployer Pension Plans (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Multiemployer Plans [Line Items]"]
["Multiemployer Plan, Period Contributions",848,855,492]
["National Electric Benefit Fund [Member]"]
["Multiemployer Plans [Line Items]"]
["Number of collective-bargaining agreements",8]
["Multiemployer Plan, Period Contributions",743,755,417]
["Eighth District Electrical Pension Fund [Member]"]
["Multiemployer Plans [Line Items]"]
["Number of collective-bargaining agreements",1]
["Multiemployer Plan, Period Contributions",105,100,75]

{"sheet":"Income_Taxes_Details","index":78,"n_rows":63,"n_cols":4,"rows_kept":63,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Income Taxes (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Income before income taxes"]
["Income before income taxes",38300,35565,40658]
["Provision for income taxes"]
["Federal",13159,7089,15853]
["State",2524,2183,2239]
["Canadian",2127,1724,1578]
["Total current",17810,10996,19670]
["Deferred taxes",-2679,1716,-3607]
["Total taxes on income",15131,12712,16063]
["Tax rate reconciliation"]
["Statutory U.S. federal tax rate",0.35,0.35,0.35]
["State income taxes, net of federal benefit",3.9E-2,3.5999999999999997E-2,3.9E-2]
["Effect of Canadian income taxes",-1.7000000000000001E-2,-1.6E-2,-0.01]
["Nondeductible expenses",1.9E-2,1.9E-2,1.4E-2]
["ESOP dividend deduction",-7.0000000000000001E-3,-8.0000000000000002E-3,-7.0000000000000001E-3]
["Audit settlements and uncertain tax adjustments",1.6E-2,-2.1999999999999999E-2,1.7999999999999999E-2]
["All other, net",-5.0000000000000001E-3,-2E-3,-8.9999999999999993E-3]
["Effective income tax rate",0.39500000000000002,0.35699999999999998,0.39500000000000002]
["Current deferred tax assets and liabilities, net"]
["Accrued compensation obligations",3090,1883]
["Self-insurance accruals",8107,7693]
["Prepaid expenses",-3160,-2565]
["Other, net",1102,908]
["Deferred tax assets, current, gross",9139,7919]
["Less deferred tax asset valuation allowance",212,204]
["Net deferred income tax assets--current",8927,7715]
["Noncurrent deferred tax assets and liabilities, net"]
["Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Self Insurance",12554,12129]
["Accrued expenses and other liabilities",1388,895]
["Accrued stock compensation",1642,1550]
["Defined benefit pension plans",4573,1873]
["Foreign tax credit carryforward",768,768]
["Other future deductible amounts, net",2030,1737]
["Deferred tax assets, gross, noncurrent",22955,18952]
["Less deferred tax asset valuation allowance",556,564]
["Deferred tax assets, net of valuation allowance",22399,18388]
["Intangibles",269,234]
["Property and equipment",20425,20718]
["Deferred tax liability, noncurrent",20694,20952]
["Net deferred tax assets--noncurrent",1705,0]
["Net deferred tax liabilities--noncurrent",0,2564]
["Undistributed Earnings of Foreign Subsidiaries",30459]
["Unrecognized benefits and related interest and penalties"]
["Unrecognized tax benefits",1949,1221,2638]
["Portion, if recognized, would reduce tax expense and effective tax rate",1512,942]
["Accrued interest on unrecognized tax benefits",77,41]
["Accrued penalties on unrecognized benefits",0,0]
["Reconciliation of unrecognized tax benefits"]
["Balance, beginning of year",1221,2638,1825]
["Additions based on tax positions related to the current year",587,370,667]
["Additions for tax positions of prior years",234,133,149]
["Reductions for tax positions of prior years",-79,-1155,-3]
["Reductions related to settlements with taxing authorities",0,-460,0]
["Lapses in statutes of limitations",-14,-305,0]
["Balance, end of year",1949,1221,2638]
["United States [Member]"]
["Income before income taxes"]
["Income before income taxes",30380,29203,35414]
["Canada [Member]"]
["Income before income taxes"]
["Income before income taxes",7920,6362,5244]

{"sheet":"Earnings_Per_Share_Information2","index":79,"n_rows":14,"n_cols":12,"rows_kept":14,"cut":false,"hidden":false,"merged":[[0,1,0,8],[0,9,0,11]]}
["Earnings Per Share Information (Details) (USD $)","3 Months Ended",{"$nulls":7},"12 Months Ended"]
["In Thousands, except Share data, unless otherwise specified","Dec. 31, 2014","Sep. 27, 2014","Jun. 28, 2014","Mar. 29, 2014","Dec. 31, 2013","Sep. 28, 2013","Jun. 29, 2013","Mar. 30, 2013","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Earnings Per Share [Abstract]"]
["Net income",5646,9657,14046,-6180,5385,8644,13436,-4612,23169,22853,24595]
["Weighted-average shares, basic"]
["Outstanding",{"$nulls":8},13337198,13639356,13867771]
["Partially-paid share subscriptions",{"$nulls":8},484025,531325,234595]
["Basic weighted-average shares",{"$nulls":8},13821223,14170681,14102366]
["Weighted-average shares, diluted"]
["Exercise of stock subscription purchase rights",{"$nulls":8},54824,34273,5750]
["Exercise of stock options and awards",{"$nulls":8},362229,397478,500741]
["Diluted weighted-average shares",{"$nulls":8},14238276,14602432,14608857]
["Earnings per share--basic:",0.21,0.72,1.04,-0.28999999999999998,0.34,0.63,0.97,-0.33,1.68,1.61,1.74]
["Earnings per share--diluted:",0.22,0.69,1.01,-0.28999999999999998,0.35,0.61,0.94,-0.33,1.63,1.57,1.68]

{"sheet":"Operations_by_Business_Segment2","index":80,"n_rows":53,"n_cols":16,"rows_kept":53,"cut":false,"hidden":false,"merged":[[49,0,49,15],[50,1,50,15],[51,1,51,15],[52,1,52,15],[0,1,0,9],[0,10,0,15],[1,1,1,2],[1,10,1,11],[1,12,1,13],[1,14,1,15]]}
["Operations by Business Segment and Geographic Information Operations by Busines Segment (Details) (USD $)","3 Months Ended",{"$nulls":8},"12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014",null,"Sep. 27, 2014","Jun. 28, 2014","Mar. 29, 2014","Dec. 31, 2013","Sep. 28, 2013","Jun. 29, 2013","Mar. 30, 2013","Dec. 31, 2014",null,"Dec. 31, 2013",null,"Dec. 31, 2012"]
["Segment Reporting Information [Line Items]"]
["Number of Reportable Segments",{"$nulls":9},2]
["Revenues",{"$nulls":9},789911,null,713848,null,680153]
["Income (loss) from operations",7769,null,17144,23815,-4725,8687,14881,23230,-6009,44003,null,40789,null,45767]
["Interest expense",{"$nulls":9},2948,null,2708,null,2698]
["Interest income",{"$nulls":9},295,null,311,null,200]
["Other",{"$nulls":9},-3050,null,-2827,null,-2611]
["Income before income taxes",{"$nulls":9},38300,null,35565,null,40658]
["Depreciation",{"$nulls":9},40970,null,38231,null,37365]
["Amortization",{"$nulls":9},2070,null,1980,null,1742]
["Capital expenditures",{"$nulls":9},55731,null,45205,null,29734]
["Segment assets, total",381004,{"$nulls":4},333378,null,null,null,381004,null,333378,null,330932]
["Utility Services"]
["Segment Reporting Information [Line Items]"]
["Revenues",{"$nulls":9},404519,null,376520,null,375300]
["Income (loss) from operations",{"$nulls":9},21382,null,16070,null,20107]
["Depreciation",{"$nulls":9},23225,null,22261,null,22844]
["Amortization",{"$nulls":9},174,null,359,null,465]
["Capital expenditures",{"$nulls":9},25994,null,21642,null,15737]
["Segment assets, total",150002,{"$nulls":4},145021,null,null,null,150002,null,145021,null,150294]
["Residential Commercial Services"]
["Segment Reporting Information [Line Items]"]
["Revenues",{"$nulls":9},386274,null,334878,null,303420]
["Income (loss) from operations",{"$nulls":9},37232,null,33566,null,30787]
["Depreciation",{"$nulls":9},14544,null,13286,null,12236]
["Amortization",{"$nulls":9},1896,null,1440,null,1058]
["Capital expenditures",{"$nulls":9},17490,null,17577,null,10266]
["Segment assets, total",144413,{"$nulls":4},122542,null,null,null,144413,null,122542,null,122298]
["All Other"]
["Segment Reporting Information [Line Items]"]
["Revenues",{"$nulls":9},-882,null,2450,null,1433]
["Income (loss) from operations",{"$nulls":9},-6037,null,-2869,null,-1366]
["Depreciation",{"$nulls":9},0,null,0,null,0]
["Amortization",{"$nulls":9},0,null,0,null,0]
["Capital expenditures",{"$nulls":9},0,null,0,null,0]
["Segment assets, total",0,{"$nulls":4},0,null,null,null,0,null,0,null,0]
["Corporate, Non-Segment [Member]"]
["Segment Reporting Information [Line Items]"]
["Revenues",{"$nulls":9},0,null,0,null,0]
["Income (loss) from operations",{"$nulls":9},-8574,"[1]",-5978,null,-3761,"[1]"]
["Interest expense",{"$nulls":9},2948,null,2708,null,2698]
["Interest income",{"$nulls":9},295,null,311,null,200]
["Other",{"$nulls":9},-3050,null,-2827,null,-2611]
["Depreciation",{"$nulls":9},3201,"[2]",2684,"[2]",2285,"[2]"]
["Amortization",{"$nulls":9},0,null,181,null,219]
["Capital expenditures",{"$nulls":9},12247,null,5986,null,3731]
["Segment assets, total",86589,"[3]",null,null,null,65815,null,null,null,86589,"[3]",65815,null,58340,"[3]"]
[]
["[1]","Reconciling adjustments from segment reporting to consolidated external financial reporting include reclassification of depreciation expense and allocation of corporate expenses."]
["[2]","Adjustments to declining-balance method depreciation expense from straight-line method and depreciation and amortization of corporate assets."]
["[3]","Corporate assets include cash, prepaid expenses, corporate facilities, enterprise-wide information systems and other nonoperating assets."]

{"sheet":"Operations_by_Business_Segment3","index":81,"n_rows":13,"n_cols":4,"rows_kept":13,"cut":false,"hidden":false,"merged":[[0,1,0,3]]}
["Operations by Business Segment and Geographic Information Geographic Information (Details) (USD $)","12 Months Ended"]
["In Thousands, unless otherwise specified","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Segment Reporting Information [Line Items]"]
["Revenues",789911,713848,680153]
["Long-lived assets, net",213808,181362,169183]
["United States [Member]"]
["Segment Reporting Information [Line Items]"]
["Revenues",706145,637524,607339]
["Long-lived assets, net",196116,166598,153946]
["Canada [Member]"]
["Segment Reporting Information [Line Items]"]
["Revenues",83766,76324,72814]
["Long-lived assets, net",17692,14764,15237]

{"sheet":"Fair_Value_Measurements_and_Fi2","index":82,"n_rows":48,"n_cols":5,"rows_kept":48,"cut":false,"hidden":false,"merged":[[0,1,1,1],[0,2,1,2],[0,3,1,3],[0,4,1,4]]}
["Fair Value Measurements and Financial Instruments Fair Value Measurements (Details) (USD $)","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012","Jul. 22, 2010"]
["In Thousands, unless otherwise specified"]
["Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"]
["Defined benefit pension plan assets",21567,25754,22957]
["Revolving credit facility, noncurrent",44500,20000]
["Senior unsecured notes",30000,30000,null,30000]
["Long-term debt",81306,50034]
["Fair Value, Inputs, Level 1 [Member]"]
["Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"]
["Defined benefit pension plan assets",19125,24028]
["Fair Value, Inputs, Level 2 [Member]"]
["Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"]
["Defined benefit pension plan assets",2442,1726]
["Fair Value, Inputs, Level 3 [Member]"]
["Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"]
["Defined benefit pension plan assets",0,0]
["Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]"]
["Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"]
["Assets invested for self-insurance, classified as other assets, noncurrent",13684,12716]
["Defined benefit pension plan assets",19125,24028]
["Deferred compensation",0,0]
["Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]"]
["Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"]
["Assets invested for self-insurance, classified as other assets, noncurrent",0,0]
["Defined benefit pension plan assets",2442,1726]
["Deferred compensation",1423,1144]
["Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]"]
["Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"]
["Assets invested for self-insurance, classified as other assets, noncurrent",0,0]
["Defined benefit pension plan assets",0,0]
["Deferred compensation",0,0]
["Estimate of Fair Value [Member]"]
["Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"]
["Revolving credit facility, noncurrent",44500,20000]
["Senior unsecured notes",30688,28219]
["Term loans, noncurrent",7195,34]
["Long-term debt",82383,48253]
["Carrying (Reported) Amount, Fair Value Disclosure [Member]"]
["Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"]
["Revolving credit facility, noncurrent",44500,20000]
["Senior unsecured notes",30000,30000]
["Term loans, noncurrent",6806,34]
["Long-term debt",81306,50034]
["Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]"]
["Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"]
["Assets invested for self-insurance, classified as other assets, noncurrent",13684,12716]
["Defined benefit pension plan assets",21567,25754]
["Deferred compensation",1423,1144]

{"sheet":"Commitments_and_Contingencies_","index":83,"n_rows":4,"n_cols":2,"rows_kept":4,"cut":false,"hidden":false,"merged":[[0,1,1,1]]}
["Commitments and Contingencies (Details) (USD $)","Dec. 31, 2014"]
["In Thousands, unless otherwise specified"]
["Commitments and Contingencies Disclosure [Abstract]"]
["Letters of credit issued",61540]

{"sheet":"Quarterly_Results_of_Operation2","index":84,"n_rows":11,"n_cols":12,"rows_kept":11,"cut":false,"hidden":false,"merged":[[0,1,0,8],[0,9,0,11]]}
["Quarterly Results of Operations (Details) (USD $)","3 Months Ended",{"$nulls":7},"12 Months Ended"]
["In Thousands, except Per Share data, unless otherwise specified","Dec. 31, 2014","Sep. 27, 2014","Jun. 28, 2014","Mar. 29, 2014","Dec. 31, 2013","Sep. 28, 2013","Jun. 29, 2013","Mar. 30, 2013","Dec. 31, 2014","Dec. 31, 2013","Dec. 31, 2012"]
["Quarterly Financial Information Disclosure [Abstract]"]
["Revenues",202737,216604,213183,157387,180173,194772,195638,143265,789911,713848,680153]
["Gross profit (revenues less costs and expenses, operating)",72565,77613,82900,48156,63837,69114,76046,42205]
["Income (loss) from operations",7769,17144,23815,-4725,8687,14881,23230,-6009,44003,40789,45767]
["Net income (loss)",5646,9657,14046,-6180,5385,8644,13436,-4612,23169,22853,24595]
["Net income (loss) per share--Basic",0.21,0.72,1.04,-0.28999999999999998,0.34,0.63,0.97,-0.33,1.68,1.61,1.74]
["Net income (loss) per share -- Diluted:",0.22,0.69,1.01,-0.28999999999999998,0.35,0.61,0.94,-0.33,1.63,1.57,1.68]
["ESOT Valuation per share",30.1,27.8,26.4,26.4,26.4,23.9,23.2,23.2]
["Decrease in casualty insurance expense",3875,null,null,null,3951]