Business Acquisition, Contingent Consideration, Earnout Target Period [Axis] Information pertaining to earnout target periods. Debt Instrument Variable Rate Base [Axis] The alternative reference rates that may be used to calculate the variable interest rate of the debt instrument. Earnout Target 2011 [Member] 2011 earnout target Represents the 2011 earnout target. Rockford Corporation [Member] Rockford Represents information pertaining to Rockford Corporation, an acquiree of the entity. Twelve month period Represents the earnout target period of twelve months ending December 31, 2013. Earnout Target Twelve Month Period [Member] Eighteen month period Represents the earnout target period of eighteen months ending June 30, 2014. Earnout Target Eighteen Month Period [Member] Debt Instrument Variable Rate Base [Domain] Identification of the reference rate that is used to calculate the variable interest rate of the debt instrument. James Construction Group LLC [Member] JCG Represents information pertaining to James Construction Group LLC, an acquiree of the entity. Earnout Target 2013 [Member] 2013 earnout target Represents the 2013 earnout target. Sprint Pipeline Services LP [Member] Sprint Represents information pertaining to Sprint Pipeline Services, L.P., an acquiree of the entity. Amendment Description Saxon Group [Member] Saxon Represents information pertaining to The Saxon Group, an acquiree of the entity. Amendment Flag Earnout Target 2012 [Member] 2012 earnout target Represents the 2012 earnout target. Earnout Target 2010 [Member] 2010 earnout target Represents the 2010 earnout target. Engineering [Member] Engineering Represents information pertaining to the engineering segment of the entity. West Construction Services [Member] West Construction Services Represents information pertaining to the west construction services segment of the entity. East Construction Services [Member] East Construction Services Represents information pertaining to the east construction services segment of the entity. Pluris LLC [Member] Pluris, LLC Represents information pertaining to Pluris, LLC, a related party of the entity. St Bernard Levee Partners [Member] Bernard Represents information pertaining to St. Bernard Levee Partners, an equity method investee of the entity. Wes Pac Energy LLC [Member] WesPac Represents information pertaining to WesPac Energy, LLC, an equity method investee of the entity. Debt Instrument Variable Rate Base LIBOR [Member] LIBOR The London Interbank Offered Rate (LIBOR) used to calculate the variable interest rate of the debt instrument. Debt Instrument Variable Rate Base Prime Rate [Member] The issuing bank's prime lending rate used to calculate the variable interest rate of the debt instrument. Prime Rate Kealine Holdings LLC [Member] Kealine Represents information pertaining to Kealine Holdings, LLC, an entity which holds interest in equity method investment along with the reporting entity. Lemmie Rockford [Member] Lemmie Rockford Represents information pertaining to Lemmie Rockford, a related party who is one of the stockholders of the entity. Roger Newnham [Member] Roger Newnham Represents information pertaining to Roger Newnham, a related party who is one of the stockholders and manager of subsidiary of the entity. Stockdale Investment Group Inc [Member] SIGI Represents information pertaining to Stockdale Investment Group, Inc., a related party in which Chief Executive Officer, President and Chairman of the Board of Directors and largest stockholder of the entity holds a majority interest. Ruby Contract [Member] Ruby contract Represents information pertaining to the Ruby contract. Louisiana DOT [Member] Louisiana DOT Represents information pertaining to Louisiana DOT, a major customer of the entity. Current Fiscal Year End Date Large Gas and Electric Utility [Member] Large gas and electric utility Represents information pertaining to a large gas and electric utility, a major customer of the entity. Top Ten Customers [Member] Top ten customers Represents information pertaining to the top ten customers of the entity. Subordinated Promissory Note A [Member] Note A Represents a portion of subordinated promissory note A issued in connection with business acquisition. Credit Facility with Private Bank and Trust Company [Member] Agreement with PrivateBank and Trust Company Represents information pertaining to loan and security agreement with The PrivateBank and Trust Company. Debt Instrument, Interest Rate Period [Axis] Represents information pertaining to interest rate period of debt instrument. Interest Rate Period after 24 Months Until Maturity [Member] Thereafter until maturity Represents the interest rate period after twenty four months until maturity of debt instrument. Interest Rate Period, Month 13 Through Month 24 [Member] For months 13 through 24 Represents interest rate period of thirteen months through twenty four months. Interest Rate Period, First 12 Months [Member] For first 12 months Represents the interest rate period of the first twelve months. Credit Facility with Canadian Bank [Member] Credit facility with a Canadian bank Represents information pertaining to credit facility with a Canadian bank. Revolving Loan A [Member] Revolving Loan A Represents information pertaining to revolving loan A under the credit facility. Revolving Loan B [Member] Revolving Loan B Represents information pertaining to revolving loan B under the credit facility. Document Period End Date Subordinated Promissory Note B [Member] Note B Represents a portion of subordinated promissory note B issued in connection with business acquisition. Credit Facility with Bank of the West [Member] Represents information pertaining to the credit agreement with Bank of the West. Agreement with Bank of the West Interest Rate Period over Life [Member] Represents the interest rate period over the life of the debt instrument. Over the life of the note Document and Entity Information Customer retention deposits and restricted cash Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment within one year or during the operating cycle, if shorter. And also includes cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. Customer Retention Deposits and Restricted Cash, Current Other current assets Increase (Decrease) in Inventories Prepaid Expenses and Other Assets The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets or income taxes. Increase (Decrease) in Deferred Tax Assets Liabilities, Net This element represents net change in deferred tax assets and liabilities net. Net deferred tax (assets) liabilities Payments for Acquisitions Cash paid for acquisitions The cash outflow associated with the acquisitions of businesses or productive assets. Cash Paid During the Year [Abstract] Cash paid during the period for: Entity [Domain] Components of Cash Paid for Acquisitions [Abstract] Components of cash paid for acquisitions: Non-cash activities: Noncash Activities [Abstract] Business Activity Contingent Earnout Liabilities [Text Block] Contingent Earnout Liabilities The entire disclosure related to contingent earn out liabilities pertaining to a business combination. Dividends and Earnings Per Share Dividends and Earnings Per Share Dividends and Earnings Per Share Disclosure [Text Block] The entire disclosure for dividends paid or declared and earnings per share. Significant Revision in Contract Estimate [Policy Text Block] Disclosure of accounting policy for significant revision in contract estimate. Revision in contract estimate Costs Estimated Earnings on Uncompleted Contracts or Programs [Table Text Block] Schedule of costs and estimated earnings on uncompleted contracts Tabular disclosure of costs and estimated earnings on uncompleted contracts and related amounts billed. Costs Estimated Earnings Billings in Excess on Uncompleted Contracts or Programs Balance Sheet Disclosure Table Text Block] Schedule of net costs and estimated earnings on uncompleted contracts included in consolidated balance sheet Tabular disclosure of net costs and estimated earnings in excess of related billings on uncompleted contracts distributed by balance sheet accounts. Equity Method Investment Summarized Financial Information Statement of Financial Position [Table Text Block] Balance sheet data Tabular disclosure of financial position of an equity method investee. Equity Method Investment Summarized Financial Information Statement Income [Table Text Block] Tabular disclosure of results of operations of an equity method investee. Earnings data Schedule of Fair Value of Consideration Transferred [Table Text Block] Schedule of fair value of the consideration to selling shareholders Tabular disclosure of fair value of the consideration transferred in a business acquisition. Schedule of Segment Reporting Information, Revenue, by Segment [Table Text Block] Schedule of revenue by segment Tabular disclosure of the revenue for each reportable segment. Schedule of Segment Reporting Information, Gross Profit, by Segment [Table Text Block] Schedule of gross profit by segment Tabular disclosure of the gross profit for each reportable segment. Schedule of Segment Reporting Information, Goodwill, by Segment [Table Text Block] Schedule of amount of goodwill recorded by segment Tabular disclosure of goodwill by reportable segment. Business Acquisition, Period for which Acquiree Name is Allowed to be Used Period for which the acquiree name is allowed to be used Represents the period for which the entity is allowed to use the acquiree name as per the purchase agreement. Concentration Risk, Number of Top Customers Number of top customers Represents the number of top customers who typically generate revenue in excess of a specified percentage of total revenues for the entity and consist of a different group of customers in each year. Concentration Risk, Number of Calendar Years in which Top Customers Generate Specified Percentage of Revenue Number of calendar years in which top customers typically generate minimum specified percentage of revenue Represents the number of calendar years in which top customers typically generate minimum specified percentage of revenue. Concentration Risk, Minimum Percentage of Revenues Generated by Specified Number of Top Customers Minimum percentage of revenues generated by top ten customers Represents the minimum percentage of revenue typically generated by specified number of customers in any one calendar year. Costs Incurred on Uncompleted Contracts Costs incurred on uncompleted contracts Represents the amount of costs incurred on uncompleted contracts. Gross Profit Recognized on Uncompleted Contracts Gross profit recognized Represents the amount of gross profit recognized on uncompleted contracts. Costs and Estimated Earnings on Uncompleted Contracts. Costs and Estimated Earnings on Uncompleted Contracts Represents the total amount of costs incurred plus estimated earnings on uncompleted contracts. Billings to Date on Uncompleted Contracts Less: billings to date Represents the billings to date on all uncompleted contracts. Net Costs and Estimated Earnings in Excess of Billings Net cost and estimated earnings in excess of billings Represents the net costs and estimated earnings in excess of billings on all uncompleted contracts. Equity Method Investment, Summarized Financial Information, Balance Sheet [Abstract] Balance sheet data Equity Method Investment, Summarized Financial Information, Net Assets Net assets Represents the amount of net assets reported by an equity method investment of the entity. Equity Method Investment, Summarized Financial Information, Expenses Expenses Represents the amount of expenses reported by an equity method investment of the entity. Equity Method Investment, Number of Potential Projects Terminated Number of potential projects terminated by major oil refining third party Represents the number of potential projects of equity method investee terminated. Equity Method Investment, Non Recoverable Amount of Non Reimbursed Project Development Costs and Reserves for Assets Expensed Amount expensed Represents the amount of non-reimbursed project development costs and non-recoverable reserves for assets expensed by equity method investee due to termination of potential projects. Represents the percentage of share in expenses of equity method investment of the entity. Equity Method Investment, Percentage of Share in Expenses Share of expenses recorded by the entity (as a percent) Business Acquisition, Additional Disclosure [Abstract] Additional disclosure Business Acquisition, Number of Business Days Prior to Closing Date upon which Average Price of Common Stock is Based Number of business days prior to the closing date upon which average closing price of common stock is based Represents the number of business days prior to the closing date upon which average closing price of common stock is based. Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Costs and Estimated Earnings in Excess of Billings Costs and estimated earnings in excess of billings The amount of costs and estimated earnings in excess of billings recognized as of the acquisition date. Business Combination Recognized, Identifiable Assets Acquired and Liabilities Assumed Inventory Other Assets Inventory and other assets The amount of inventory and other assets recognized as of the acquisition date. Business Acquisition, Goodwill and Intangible Assets, Tax Deductible Period Period for which goodwill and other intangible assets are deductible for income tax purposes Represents the period for income tax deduction, for acquired goodwill and other intangible assets of investee entity, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Represents carrying amount of reserve for estimated expenses on completed contracts, which is expected to be paid within one year of the date of the statement of financial position. Reserve for Estimated Expenses Reserve for estimated expenses on completed contracts Accrued Overhead Cost, Current Accrued overhead cost Carrying value, as of the balance sheet date, of obligations incurred through that date and payable for overhead costs. Used to reflect the current portion of liabilities (due within one year or within the normal operating cycle if longer). Letters of Credit Maximum Borrowing Capacity Maximum borrowing capacity under the letters of credit without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding. Maximum amount the Lender agreed to issue letters of credit Line of Credit Facility Annual Fee Percentage The annual fee percentage based on any issued and outstanding letters of credit under the facility. Annual fee (as a percent) Debt Instrument, Percentage of Cash Proceeds Raised from Incurrence of Indebtedness Agreed to be Used for Prepayment Percentage of cash proceeds raised from incurrence of indebtedness agreed to be used to prepay a portion or all of debt instrument Represents the percentage of cash proceeds raised from incurrence of indebtedness agreed to be used to prepay a portion or all of debt instrument. Debt Instrument, Threshold of Net Proceeds from Completion of Equity Financing to be Used for Determining Required Prepayment Threshold of net proceeds from completion of equity financing to be used in determining prepayment amount of debt instrument Represents the threshold amount of net proceeds from completion of equity financing to be used in determining the required prepayment amount on the debt instrument. Debt Instrument, Percentage of Net Proceeds in Excess of Specified Amount from Completion of Equity Financing Agreed to be Used for Prepayment Percentage of net proceeds from equity financing in excess of specified amount agreed to be used to prepay a portion or all of debt instrument Represents the percentage of the net proceeds from an equity financing in excess of a specified amount used for prepayment of debt instrument. Debt Instrument, Periodic Payment Term Period over which principal and interest are payable Represents the period over which periodic payments of principal and interest are payable. Debt Instrument, Face Amount, Number of Portions Number of portions of principal amount of debt instrument Represents the number of portions of principal amount of the debt instrument. Basis of Presentation Term of credit facility Represents the term of credit facility. Line of Credit Facility, Term Line of Credit Facility, Number Number of lines of credit Represents the number of available lines of credit under the credit agreement. Entity Well-known Seasoned Issuer Information pertaining to interest rate period of debt instrument. Debt Instrument, Interest Rate Period [Domain] Entity Voluntary Filers Business Acquisition, Contingent Consideration, Earnout Target Period [Domain] Represents each earnout target period. Entity Current Reporting Status Business Acquisition, Contingent Consideration, EBITDA for Measuring Potential Cash Payment EBITDA threshold for measuring financial performance Represents the amount of EBITDA (income before interest, taxes depreciation and amortization) to be achieved by the acquiree in earnout target period to measure potential contingent consideration. Entity Filer Category Related Party Transaction, Agreement Amount Amount of agreement to construct a wastewater facility Represents the amount of agreement entered into by the entity to construct a wastewater facility. Entity Public Float Income Tax, Period of Statute of Limitations of State and Foreign Jurisdictions, Minimum Minimum period of statute of limitations of state and foreign jurisdictions Represents the minimum period of statute of limitations of state and foreign jurisdictions. Entity Registrant Name Income Tax, Period of Statute of Limitations of State and Foreign Jurisdictions, Maximum Maximum period of statute of limitations of state and foreign jurisdictions Represents the maximum period of statute of limitations of state and foreign jurisdictions. Entity Central Index Key Dilutive effect of shares issued to independent directors Incremental Common Shares Attributable to Shares Issued to Independent Directors under Share Based Payment Arrangements Represents the additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of shares issued to independent directors under share based payment arrangements. Incremental Common Shares Attributable to Employee Purchased Shares under Share Based Payment Arrangements Represents the additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of shares issued to managers and executives under share based payment arrangements. Dilutive effects of employee purchased shares Earnings Per Share [Table] Disclosure of information pertaining to earnings per share. Earnings Per Share [Line Items] Earnings per share Entity Common Stock, Shares Outstanding Stockholders Equity [Table] Disclosure pertaining to stockholder's equity. Stockholders Equity [Line Items] Stockholders' equity Represents the average rate per share of the common stock repurchased during the period. Average cost of repurchased shares of stock (in dollars per share) Stock Repurchased During Period Average Share Price Bonds, Issued and Outstanding Bid and completion bonds issued and outstanding Represents the amount of bonds issued and outstanding. Revenue, Percentage % of Segment Revenue The percentage of revenue to total revenue. % of revenue Gross Profit as Percentage of Segment Revenue % of Segment Revenue Represents the gross profit represented as a percentage of total segment revenue. Stock Issued Shares Contingent Agreement One Issuance of common shares to Former Primoris owners (in shares) The number of shares of stocks issued pursuant to achieving acquisition contingencies in agreement one. Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accounts Payable and Accrued Liabilities Value of common stock issued pursuant to acquisition one. Common Stock Issued During Period Value Acquisition One Stock issued for the purchase of Cravens Services, Inc Other accounts receivable Accounts and Other Receivables, Net, Current Common Stock Issued During Period Shares Acquisition One Number of shares of common stock issued pursuant to acquisition one. Stock issued for the purchase of Cravens Services, Inc (in shares) Stock Issued During Period Value Warrants Exercised Warrant exercises Value of stock issued during the period as a result of the exercise of warrants. Warrant exercises (in shares) Stock Issued During Period Shares Warrants Exercised Number of shares of stock issued during the period as a result of the exercise of warrants. Common Stock Issued During Period Value Acquisition Two Stock issued for the purchase of Rockford Corporation Value of common stock issued pursuant to acquisition two. Common Stock Issued During Period Shares Acquisition Two Stock issued for the purchase of Rockford Corporation (in shares) Number of shares of common stock issued pursuant to acquisition two. Preferred Stock Issued During Period Value Acquisitions Preferred stock issued for purchase of James Construction Group ("JCG") Value of preferred stock issued pursuant to acquisitions during the period. Preferred Stock Issued During Period Shares Acquisitions Preferred stock issued for purchase of James Construction Group ("JCG") (in shares) Number of shares of preferred stock issued during the period pursuant to acquisitions. Adjustments to Additional Paid in Capital, Purchase of Units from Underwriters Change in additional paid in capital as a result of a adjustments of amount contributed by the underwriters to the company as per the agreement. Purchase of units from EarlyBirdCapital Stock Issued During Period Value Contingent Agreement Two Value of stock issued pursuant to achieving acquisition contingencies in agreement two. Stock issued for the purchase of Cravens Services, Inc as per the contingent agreement Document Fiscal Year Focus Stock Issued During Period Shares Contingent Agreement Two Number of shares of stock issued pursuant to achieving acquisition contingencies in agreement two. Stock issued for the purchase of Cravens Services, Inc as per the contingent agreement (in shares) Document Fiscal Period Focus Shares Outstanding During Period Value Outstanding shares of Rhapsody Acquisition Corp. at the time of reverse merger dated July 31, 2008 Equity impact of the value of stock outstanding at the time of reverse merger. Shares Outstanding During Period Shares Outstanding shares of Rhapsody Acquisition Corp. at the time of reverse merger dated July 31, 2008 (in shares) Number of shares of stock outstanding at the time of reverse merger. Distributions to Former Primoris stockholders Distributions to Premerger Stockholders Distribution made to stockholders of one of the pre-merger entities. Warrants and Purchase Options for Purchase of Stock Warrants and Purchase Options for Purchase of Stock [Text Block] Warrants and Purchase Options For Purchase of Stock The entire disclosure for warrants and unit purchase options available for the purchase of common stock. Business Acquisition Purchase Additional Cash Due Estimated cash payment due sellers The amount of additional cash due related to a business combination. Potential contingent consideration Business Acquisition, Contingent Consideration, Potential Cash Common Stock Payment Amount of cash and value of common stock that could be paid from the contingent consideration arrangement. Potential contingent consideration Schedule of Revenues from External Customers and Total Assets by Geographical Areas [Table Text Block] Tabular disclosure of information concerning total assets located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. Schedule of revenue and total assets by geographic area Business Acquisition Cost of Acquired Entity The total cost of the acquired entity excluding direct costs of the acquisition. Total consideration Business Combination Recognized, Identifiable Assets Acquired and Liabilities Assumed Capital Lease Obligations The amount of capital lease obligations assumed which have been recognized as of the acquisition date. Capital lease obligations Legal Entity [Axis] Other accrued liabilities Business Combination Recognized, Identifiable Assets Acquired and Liabilities Assumed Other Accrued Liabilities The amount of other accrued liabilities assumed which have been recognized as of the acquisition date. Document Type Customer retention deposits and restricted cash Increase (Decrease) in Customer Retention Deposits and Restricted Cash, Current Represents changes in amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment within one year or during the operating cycle, if shorter. And also includes changes in cash and cash equivalent items which are restricted as to withdrawal or usage. Business Acquisition Cost of Acquired Entity Cash Cash consideration Represents fair value of consideration transferred to selling shareholders in cash. Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Working Capital Working capital Represents the amount of working capital recognized as of the acquisition date. Business Acquisition, Purchase Price Allocation, Assets Acquired Two Fair value of assets acquired - Silva The amount of acquisition cost of a business combination allocated to assets acquired for the second business acquisition. One Customer [Member] One customer Represents information pertaining to one customer of the entity. Concentration Risk, Number of Customers Number of customers Represents the number of customers who typically contribute accounts receivable in excess of a specified percentage. Business Acquisition, Cost of Acquired Entity Additional Cash Payable Additional cash payable in the fourth quarter 2012 Amount of additional cash payable to acquire the entity. Cash payment due sellers in fourth quarter 2012 Silva Contracting Company Inc and Tarmac Materials LLC and C3 Interests LLC [Member] Silva Represents information pertaining to Silva Contracting Company, Inc., Tarmac Materials, LLC and C3 Interests, LLC, the acquirees of the entity. Fair value of assets acquired - Sprint Business Acquisition Purchase Price Allocation Assets Acquired One The amount of acquisition cost of a business combination allocated to assets acquired for the first business acquisition. Business Acquisition, Purchase Price Allocation, Assets Acquired Three The amount of acquisition cost of a business combination allocated to assets acquired for the third business acquisition. Fair value of assets acquired - Saxon Business Acquisition Pro Forma Percentage of Tax Rate Used in Calculating Taxes on Income from Continuing Operations Percentage of pro forma tax rate used in calculating taxes on income from continuing operations Represents the percentage of pro forma tax rate used in calculating taxes on income from continuing operations for a period, as if the business combination or combinations had been completed at the beginning of a period. Business Acquisitions Pro Forma Income (Loss) from Continuing Operations before Tax Income before provision for income taxes The pro forma income from continuing operations before tax effect for the period, as if the business combination or combinations had been completed at the beginning of a period. Business Acquisition Pro Forma Weighted Average Number of Shares Outstanding [Abstract] Weighted average common shares outstanding: Business Acquisition Pro Forma Weighted Average Number of Shares Outstanding Basic Basic (in shares) The pro forma number of basic weighted average shares outstanding for a period, as if the business combination or combinations had been completed at the beginning of a period. Business Acquisition Pro Forma Weighted Average Number of Diluted Shares Outstanding Diluted (in shares) The pro forma number of diluted weighted average shares outstanding for a period, as if the business combination or combinations had been completed at the beginning of a period. Business Acquisition Pro Forma Earnings Per Share [Abstract] Earnings per share: Partnerships and Joint Ventures Policy [Text Block] Disclosure of accounting policy for partnerships and joint ventures of the reporting entity. Partnerships and joint ventures Number of Variable Interest Entities Whose Financial Results are Consolidated Number of VIEs for which financial results are consolidated Represents the number of VIE joint ventures for which the entity has consolidated financial results. Accrued Liability Due Acquiree Sellers Accrued liability for Rockford sellers Carrying value, as of the balance sheet date, of obligations incurred through that date and payable to sellers of the acquiree of the reporting entity. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, if longer). Line Of Credit Facility, Maximum Borrowing Capacity At End Of Fiscal Year Maximum borrowing capacity at the end of the fiscal year Maximum borrowing capacity at the end of the fiscal year under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Business Acquisition, Number of Targets to be Achieved for Contingent Consideration Potential Cash Payment Number of operating performance targets to be achieved for cash payment Represents the number of operating performance targets to be achieved out of the specified targets for potential cash payments under the contingent consideration arrangement. Business Acquisition Number of Performance Targets for Contingent Consideration Cash Payment Number of operating performance targets Represents the number of operating performance targets under the contingent consideration arrangement. Business Acquisition Contingent Consideration EBITDA Meausrement Period for Potential Cash Payment EBITDA measurement period Represents the period considered to measure income before interest, taxes, depreciation and amortization for payment of contingent consideration. Effective tax rate for income attributable to Primoris (as a percent) A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations, excluding income attributable to noncontrolling interests. Effective Income Tax Rate, Continuing Operations Excluding Income Attributable to Noncontrolling Interests Represents information pertaining to the eighth amendment to the loan and security agreement with The PrivateBank and Trust Company. Amended Credit Facility with Private Bank and Trust Company [Member] Amended Agreement Accounts Payable, Current Accounts payable Accounts receivable Accounts Receivable [Member] Accrued expenses and other current liabilities Accrued Liabilities, Current [Abstract] United States UNITED STATES Insurance, including self-insurance reserves Accrued Insurance, Current Accrued expenses and other current liabilities Total accrued expenses and other current liabilities Accrued Liabilities, Current Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Amortization Period Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Acquired intangible assets Acquired Finite-Lived Intangible Assets [Line Items] Additional Paid in Capital, Common Stock Additional paid-in capital Additional Paid-in Capital Additional Paid-in Capital [Member] Buyback of warrants Adjustments to Additional Paid in Capital, Other Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Amortization expense of intangible assets Amortization of Intangible Assets Amortization of intangible assets Assets, Current [Abstract] Current assets: Assets [Abstract] ASSETS Assets, Current Total current assets Assets Total assets Total Assets Assets Assets of Disposal Group, Including Discontinued Operation, Current Current assets from discontinued operations Basis of Presentation and Significant Accounting Policies [Text Block] Basis of Presentation Billings in excess of costs and estimated earnings Billings in Excess of Cost, Current Billings in excess of costs and estimated earnings Basic (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Business Acquisition [Axis] Cash payment made Business Acquisition, Cost of Acquired Entity, Cash Paid Cash paid Cash paid for acquisitions Contingent earnout liabilities Business Acquisition, Contingent Consideration [Line Items] Business Acquisition, Cost of Acquired Entity, Liabilities Incurred Seller's note paid off Business Acquisition, Pro Forma Information [Abstract] Pro forma results Estimated fair value of potential contingent consideration Earnout consideration Business Acquisition, Contingent Consideration, at Fair Value Contingent earnout liabilities Revenues Business Acquisition, Pro Forma Revenue Potential contingent consideration Business Acquisition, Contingent Consideration, Potential Cash Payment Business Acquisition, Acquiree [Domain] Fair value of the consideration transferred to selling shareholders Business Acquisition, Cost of Acquired Entity, Purchase Price [Abstract] Schedule of pro forma results Business Acquisition, Pro Forma Information [Table Text Block] Business Acquisition, Contingent Consideration, at Fair Value, Noncurrent Long-term contingent earnout liabilities, net of current portion Net income attributable to Primoris Business Acquisition, Pro Forma Net Income (Loss) Number of shares of common stock issued Common stock issued to sellers (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Diluted (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Contingent liabilities Business Combination, Liabilities Arising from Contingencies, Amount Recognized Business Combinations Value of shares of common stock agreed to be issued Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Common stock issued for acquisition Company common stock Business Acquisition, Cost of Acquired Entity, Equity Interests Issued and Issuable Asset purchase agreement Business Acquisition [Line Items] Business combinations Business Acquisition, Contingent Consideration, at Fair Value, Current Current portion of contingent earnout liabilities Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Business Combination Disclosure [Text Block] Business Combinations Estimated Fair Value Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles Accounts payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets Change in fair value of liability Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Contingent earnout liabilities Fair value of the assets acquired and the liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Contingent Earnout Liabilities Net assets acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Business Combination, Acquisition Related Costs Merger related stock expense Costs and Estimated Earnings on Uncompleted Contracts Capital Expenditures Incurred but Not yet Paid Obligations incurred for the acquisition of property and equipment Capital Leases Capital Leases in Financial Statements of Lessee Disclosure [Text Block] Capital Lease Obligations, Current Current portion of capital leases Capital Lease Obligations, Noncurrent Long-term capital leases, net of current portion Amount Recorded on Balance Sheet Carrying (Reported) Amount, Fair Value Disclosure [Member] Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at beginning of the period Cash and cash equivalents Cash and cash equivalents at end of the period Cash Cash Acquired from Acquisition Cash acquired with acquisitions Cash acquired with acquisition Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Cash Provided by (Used in) Financing Activities, Discontinued Operations Financing activities Cash Provided by (Used in) Operating Activities, Discontinued Operations Operating activities Investing activities Cash Provided by (Used in) Investing Activities, Discontinued Operations Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate by Type [Axis] Variable Interest Entity, Classification [Domain] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Commitments and Contingencies Commitments and Contingencies. Commitments and contingencies Common Stock Common Stock [Member] Common stock, shares outstanding Common Stock, Shares, Outstanding Common Stock, Value, Issued Common stock-$.0001 par value, 90,000,000 shares authorized, 51,403,686 and 51,059,132 issued and outstanding at September 30, 2012 and December 31, 2011 Common Stock, Shares, Issued Common stock, shares issued Cash dividend declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Company Retirement Plans Deferred Compensation Agreements Compensation Related Costs, General [Text Block] Deferred Compensation Agreements Concentration Risk Type [Domain] Customer concentration Concentration Risk [Line Items] Concentration Risk Benchmark [Domain] Concentration Risk [Table] Concentration Risk Benchmark [Axis] Customer concentration Concentration Risk Disclosure [Text Block] Concentration Risk Type [Axis] Percentage of concentration risk Concentration Risk, Percentage Retention Contract Receivable Retainage, Due in Next Twelve Months Contracts receivable, net of allowance for doubtful accounts Contract Receivable, Due in Next Twelve Months Cost of Services Cost of revenues Costs in Excess of Billings on Uncompleted Contracts or Programs [Abstract] Amount included in consolidated balance sheet Costs and estimated earnings in excess of billings Costs in Excess of Billings on Uncompleted Contracts or Programs Expected to be Collected within One Year Credit Facility [Domain] Credit Facility [Axis] Customer concentration Customer Concentration Risk [Member] Customer relationship Customer Relationships [Member] Variable rate basis Debt Instrument, Description of Variable Rate Basis Credit arrangements Debt Instrument [Line Items] Schedule of Long-term Debt Instruments [Table] Debt Disclosure [Text Block] Credit Arrangements Credit Arrangements Initial principal amount Debt Instrument, Face Amount Monthly payment of principal and interest Debt Instrument, Periodic Payment, Principal Interest rate (as a percent) Debt Instrument, Interest Rate During Period Deferred Tax Assets, Net of Valuation Allowance, Current Deferred tax assets Deferred Tax Liabilities, Net, Noncurrent Deferred tax liabilities Depreciation, Depletion and Amortization Depreciation and amortization of intangible assets Depreciation Depreciation Discontinued Operations Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Distribution Made to Member or Limited Partner, Cash Distributions Paid Cash distributions to James shareholders Dividends - preferred Dividends, Preferred Stock, Cash Dividends - common Dividends, Common Stock, Cash Dividends Payable Accrued dividends declared Dividends Payable, Current Dividends payable Basic: Earnings Per Share, Basic [Abstract] Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Diluted: Earnings Per Share, Diluted [Abstract] Basic earnings per share (in dollars per share) Earnings Per Share, Basic Basic (in dollars per share) Dividends and Earnings Per Share Earnings Per Share [Text Block] Earnings Per Share Earnings per share: Effective tax rate on income from continuing operations before taxes and noncontrolling interests (as a percent) Effective Income Tax Rate, Continuing Operations U.S. federal statutory rate (as a percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate Payroll and related employee benefits Employee-related Liabilities, Current Revenue Equity Method Investment, Summarized Financial Information, Revenue Equity Method Investments and Joint Ventures Disclosure [Text Block] Equity Method Investments Company's equity investment Equity Method Investments. Investment in non-consolidated entities Reduction recorded to recognize an estimate for an other than temporary decrease Equity Method Investment, Other than Temporary Impairment Basis difference between the entity's original investment and its pro-rata share of the investee equity prior to any impairment adjustment Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Membership interest (as a percent) Equity Method Investment, Ownership Percentage Non-consolidated entity distributions Share in distribution Proceeds from Equity Method Investment, Dividends or Distributions Earnings data: Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] Assets Equity Method Investment, Summarized Financial Information, Assets Liabilities Equity Method Investment, Summarized Financial Information, Liabilities Cost of investment Equity Method Investment, Aggregate Cost Earnings before taxes Equity Method Investment, Summarized Financial Information, Net Income (Loss) Equity Component [Domain] Equity Method Investee, Name [Domain] Equity Method Investments Measurement Frequency [Axis] Fair Value, Hierarchy [Axis] Recurring Fair Value, Measurements, Recurring [Member] Fair Value, Measurement Frequency [Domain] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value of Assets Acquired Fair value of assets acquired - Silva Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair value measurements Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value Measurements Schedule of financial assets that are required to be measured at fair value Fair Value, Assets Measured on Recurring Basis [Table Text Block] Fair Value, Disclosure Item Amounts [Domain] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Amortization Period Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Assets, Major Class Name [Domain] 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Five Intangible assets Finite-Lived Intangible Assets [Line Items] 2014 Finite-Lived Intangible Assets, Amortization Expense, Year Three Estimated future amortization expense for intangible assets Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2013 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2012 (remaining three months) Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Foreign Currency Transaction Gain (Loss), before Tax Foreign exchange gain (loss) Gain (Loss) on Sale of Property Plant Equipment Loss (gain) on sale of property and equipment Loss (gain) on sale of property and equipment Goodwill and Intangible Asset Impairment Goodwill and intangible impairment Goodwill Goodwill Gross Profit Gross Profit Gross profit Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income before provision for income taxes Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share Loss on discontinued operations (in dollars per share) CONDENSED CONSOLIDATED STATEMENTS OF INCOME Income Tax Disclosure [Text Block] Income Taxes Income Taxes Income (Loss) from Continuing Operations Attributable to Parent Income from continuing operations Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share Loss on discontinued operations (in dollars per share) Company's equity in earnings Income (Loss) from Equity Method Investments Income from non-consolidated entities Income (loss) from non-consolidated entities Income (Loss) from Continuing Operations, Per Basic Share Income from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Income from continuing operations (in dollars per share) Income Tax Expense (Benefit) Provision for income taxes Provision for income taxes Income Taxes Paid Income taxes, net of refunds received Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Loss on discontinued operations, net of income taxes Loss on discontinued operations Net deferred taxes Increase (Decrease) in Deferred Income Taxes Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued expenses and other current liabilities Other current assets Increase (Decrease) in Other Current Assets Increase (Decrease) in Billing in Excess of Cost of Earnings Billings in excess of costs and estimated earnings Increase (Decrease) in Other Noncurrent Liabilities Other long-term liabilities Escrow deposit Increase (Decrease) in Deposit Assets Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) in Receivables Accounts receivable Increase (Decrease) in Unbilled Receivables Costs and estimated earnings in excess of billings Increase (Decrease) in Stockholders' Equity Roll Forward Increase (Decrease) in Stockholders' Equity [Roll Forward] Dilutive effect of warrants and units (in shares) Incremental Common Shares Attributable to Call Options and Warrants Dilutive effect of contingently issuable shares Incremental Common Shares Attributable to Contingently Issuable Shares Intangible Assets Disclosure [Text Block] Intangible Assets Intangible Assets Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Total Interest Expense Interest expense Interest expense Interest Paid Interest Inventory and uninstalled contract materials Inventory, Policy [Policy Text Block] Inventory, Net Inventory and uninstalled contract materials Investment Income, Interest Interest income Total commercial letters of credit outstanding Letters of Credit Outstanding, Amount Long-term Debt, Type [Domain] Long-term Debt, Type [Axis] Total lease expense Operating Leases, Rent Expense Capital Leases Commercial letters of credit Letter of Credit [Member] Liabilities, Current Total current liabilities Current liabilities Liabilities Assumed Short term payable to seller Liabilities of Disposal Group, Including Discontinued Operation, Current Current liabilities of discontinued operations Liabilities, Current [Abstract] Current liabilities: Liabilities Total liabilities Liabilities Liabilities and Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity Total liabilities and stockholders' equity Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Available borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Accounts Receivable Long-term Contracts or Programs Disclosure [Text Block] Costs and Estimated Earnings on Uncompleted Contracts Long-term Debt, Current Maturities Current portion of long-term debt Long-term Debt, Excluding Current Maturities Long-term debt, net of current portion Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingencies [Line Items] Commitments and contingencies Loss Contingency, Nature [Domain] Major Customers [Axis] Maximum Maximum [Member] Minimum Minimum [Member] Noncontrolling Interest Disclosure [Text Block] Noncontrolling Interests Noncontrolling Interest [Table] Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interest Noncontrolling Interest [Line Items] Noncontrolling interests Withdrawal liability recorded Multiemployer Plans, Withdrawal Obligation Multiemployer Plans Multiemployer Plans [Abstract] Name of Major Customer [Domain] Nature of Operations [Text Block] Business Activity Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Net Cash Provided by (Used in) Discontinued Operations [Abstract] Cash flows from discontinued operations: Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Cash flows from operating activities: Net change in cash and cash equivalents Net Cash Provided by (Used in) Continuing Operations Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net income Net Income (Loss) Available to Common Stockholders, Basic Net income attributable to Primoris Net income attributable to Primoris Numerator: Net Income (Loss) Attributable to Parent [Abstract] Net Cash Provided by (Used in) Discontinued Operations Net cash used in discontinued operations Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Net income attributable to noncontrolling interests Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Recent Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Recent Accounting Pronouncements Noncash Investing and Financing Items [Abstract] SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES Non-compete agreements Noncompete Agreements [Member] Nonoperating Income (Expense) [Abstract] Other income (expense): Number of operating segments Number of Operating Segments Noncontrolling Interests Operating Income (Loss) Operating income Backlog Order or Production Backlog [Member] Business Activity. Business Activity Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Other Nonoperating Income (Expense) Other expense Other Liabilities, Noncurrent Other long-term liabilities Other Other Accrued Liabilities, Current Foreign currency hedge effect Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Accounts Payable and Accrued Liabilities Payments for Repurchase of Warrants Repurchase of warrants Purchase of Unit Purchase Option Payments for Repurchase of Other Equity Payments of Capital Distribution Cash distributions to former Primoris stockholders Payments for Repurchase of Common Stock Repurchase of common stock Amount distributed Payments of Dividends Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Investment in joint venture Payments to Acquire Equity Method Investments Total dividend paid Payments of Ordinary Dividends, Common Stock Dividends paid Payments to Acquire Short-term Investments Purchase of short-term investments Purchase of short-term investments Multiemployer plans Pension and Other Postretirement Plans, Policy [Policy Text Block] Company Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Multiemployer Plans Postemployment Benefits Disclosure [Text Block] Multiemployer Plans Preferred Stock, Value, Issued Preferred stock-$.0001 par value, 1,000,000 shares authorized, none issued and outstanding at December 31, 2011 Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Preferred Stock Preferred Stock [Member] Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Proceeds from exercise of warrants for the issuance of common stock Proceeds from Warrant Exercises Proceeds from Issuance of Long-term Debt Proceeds from issuance of long-term debt Proceeds from Issuance of Common Stock Proceeds from issuance of common stock Proceeds from Sale of Property, Plant, and Equipment Proceeds from sale of property and equipment Proceeds from Sale of Short-term Investments Sale of short-term investments Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Net income Property and Equipment Property, Plant and Equipment, Net Property and equipment, net Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Provision for Loss on Contracts Reserve for estimated losses on uncompleted contracts Net Adjustments to Fair Value Purchase Price Allocation Adjustments [Member] Selected Quarterly Financial Information (Unaudited) Quarterly Financial Information [Text Block] Selected Quarterly Financial Information (Unaudited) Retention amounts included in accounts payable Retention Payable, Due in Next Twelve Months Range [Axis] Range [Domain] Contracts receivable and retention Receivables, Long-term Contracts or Programs Accounts Receivable Accounts receivable, net Receivables, Net, Current Accounts receivable, net Accounts receivable Related Party Transactions Disclosure [Text Block] Related Party Transactions Related party transactions Related Party Transaction [Line Items] Related Party [Domain] Lease payments to related party Related Party Transaction, Expenses from Transactions with Related Party Related Party Transactions Related Party [Axis] Repayments of Long-term Debt Repayment of long-term debt Repayments of Subordinated Debt Repayment of subordinated debt Repayments of Long-term Capital Lease Obligations Repayment of capital leases Restricted Cash and Investments, Current Customer retention deposits and restricted cash Restricted Cash and Cash Equivalents Restricted cash Retained Earnings (Accumulated Deficit) Retained earnings Retained Earnings Retained Earnings [Member] Related party revenues recognized Revenue from Related Parties Revenue recognition Revenue Recognition, Policy [Policy Text Block] Revenues and total assets by geographic area Revenues from External Customers and Long-Lived Assets [Line Items] Revolving Credit Facility [Member] Revolving line of credit Revenues Sales Revenue, Services, Net [Member] Revenues Sales Revenue, Services, Net Revenue Scenario, Unspecified [Domain] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table] Schedule of computation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of estimated future amortization expense for intangible assets Schedule of Expected Amortization Expense [Table Text Block] Schedule of accrued expenses and other current liabilities Schedule of Accrued Liabilities [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table] Summary of the fair value of assets acquired and the liabilities assumed Schedule of Purchase Price Allocation [Table Text Block] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Summary of intangible asset categories, amounts and the average amortization periods Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Equity Method Investments [Table] Equity method investments Schedule of Equity Method Investments [Line Items] Equity Method Investee, Name [Axis] Schedule of the acquired intangible assets categories, fair value and average amortization periods Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Related Party Transactions, by Related Party [Table] Summary of accounts receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Variable Interest Entities [Table] Non-United States Segment, Geographical, Groups of Countries, Group One [Member] Segment reporting information Segment Reporting Information [Line Items] Reportable Operating Segments Segment Reporting Disclosure [Text Block] Reportable Operating Segments Segment [Domain] Segment, Geographical [Domain] Selling, General and Administrative Expense Selling, general and administrative expenses Average closing stock price during the period on which stock component of the earnout was based (in dollars per share) Share Price Balance (in shares) Balance (in shares) Shares, Issued Short term investments Short-term Investments Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Letters of credit Standby Letters of Credit [Member] Statement [Table] Scenario [Axis] Statement [Line Items] Statement CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Business Segments [Axis] Equity Components [Axis] CONSOLIDATED BALANCE SHEETS CONDENSED CONSOLIDATED BALANCE SHEETS Geographical [Axis] Stock Issued During Period, Shares, Period Increase (Decrease) Amount paid for shares purchased and cancelled under share repurchase program Stock Repurchased and Retired During Period, Value Stock Issued During Period, Value, New Issues Issuance of common shares Cancelled shares for sale of foreign subsidiary (in shares) Stock Issued During Period, Shares, Share-based Compensation, Forfeited Conversion of JCG preferred to common shares Stock Issued During Period, Value, Conversion of Convertible Securities Number of shares purchased and cancelled under the share repurchase program Stock Repurchased and Retired During Period, Shares Shares of common stock issued as part of quarterly compensation of non-employee members of the Board of Directors Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock Issued Series A preferred stock issued, amount Cancelled shares for sale of foreign subsidiary Stock Issued During Period, Value, Share-based Compensation, Forfeited Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Common stock issued to non-employee directors Stock Issued During Period, Shares, New Issues Issuance of common shares (in shares) Conversion of JCG preferred to common shares (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Stock Issued During Period, Value, Share-based Compensation, Gross Stock to foreign managers Aggregate purchase price up to which shares can be acquired under share repurchase program Stock Repurchase Program, Authorized Amount Stock Issued During Period, Shares, Share-based Compensation, Gross Stock to foreign managers (in shares) Amount received in exchange for shares of common stock under a purchase arrangement Stock Issued During Period, Value, Employee Stock Purchase Plan Shares of common stock issued to managers and executives under a purchase arrangement within the Long-Term Incentive Plan Stock Issued During Period, Shares, Employee Stock Purchase Plans Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Stockholders' equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total stockholders' equity Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity Stockholders' Equity Attributable to Parent Total stockholders' equity Balance Balance Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Stockholders' Equity, Period Increase (Decrease) Amount outstanding Subordinated Debt Subordinated Promissory Note Subordinated Debt [Member] Subordinated Long-term Debt, Noncurrent Long-term subordinated debt, net of current portion Subordinated Debt, Current Current portion of subordinated debt Supplemental Cash Flow Information [Abstract] SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION Bonding Surety Bond [Member] Corporate income taxes and other taxes Taxes Payable, Current Tradename Trade Names [Member] Variable Interest Entity, Primary Beneficiary [Member] Blythe Variable Interest Entity [Line Items] Partnerships and joint ventures Variable Interest Entities [Axis] Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Denominator: Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted average shares for computation of basic earnings per share Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted average shares for computation of diluted earnings per share Business Acquisition, Purchase Price Allocation, Goodwill Amount Goodwill