Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income (loss)	$ 13,932us-gaap_NetIncomeLoss	$ 6,040us-gaap_NetIncomeLoss	$ (1,906)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation and amortization of property and equipment	12,174us-gaap_DepreciationAndAmortization	8,374us-gaap_DepreciationAndAmortization	4,637us-gaap_DepreciationAndAmortization
Amortization of intangibles	2,837us-gaap_AmortizationOfIntangibleAssets	3,057us-gaap_AmortizationOfIntangibleAssets	3,082us-gaap_AmortizationOfIntangibleAssets
Amortization of deferred financing costs	159us-gaap_AmortizationOfFinancingCosts	175us-gaap_AmortizationOfFinancingCosts	175us-gaap_AmortizationOfFinancingCosts
Provision for doubtful accounts	1,900us-gaap_ProvisionForDoubtfulAccounts	1,038us-gaap_ProvisionForDoubtfulAccounts	482us-gaap_ProvisionForDoubtfulAccounts
Write-off of debt issuance costs	233
Gain on sale of property and equipment	(460)us-gaap_GainLossOnDispositionOfAssets	(372)us-gaap_GainLossOnDispositionOfAssets	(1,280)us-gaap_GainLossOnDispositionOfAssets
Noncash stock compensation	300us-gaap_ShareBasedCompensation		4,658us-gaap_ShareBasedCompensation
Deferred income taxes	(378)	(1,782)	(767)
Other	(490)us-gaap_OtherNoncashIncomeExpense	(292)us-gaap_OtherNoncashIncomeExpense	210us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities, excluding effects of acquisitions
Accounts receivable	(10,688)	(12,777)	(6,858)
Inventories	(2,925)us-gaap_IncreaseDecreaseInInventories	(2,945)us-gaap_IncreaseDecreaseInInventories	(1,845)us-gaap_IncreaseDecreaseInInventories
Other assets	(5,121)	(2,270)	(1,948)
Accounts payable	4,585	3,902	2,013
Income taxes payable	(1,678)us-gaap_IncreaseDecreaseInIncomeTaxes	(2,602)us-gaap_IncreaseDecreaseInIncomeTaxes	2,339us-gaap_IncreaseDecreaseInIncomeTaxes
Other liabilities	5,222	4,678	1,602
Net cash provided by operating activities	19,602	4,224	4,594
Cash flows from investing activities
Restricted cash	1,708	95
Purchases of property and equipment	(6,176)	(2,665)	(2,929)
Acquisitions of businesses, net of cash acquired of $53, $0 and $375 in 2014, 2013 and 2012, respectively	(12,364)	(1,181)	(823)
Proceeds from sale of property and equipment	689	1,240	176
Proceeds from insurance			833
Net cash used in investing activities	(16,143)	(2,511)	(2,743)
Cash flows from financing activities
Proceeds from initial public offering of common stock, net of costs	87,645
Proceeds from secondary public offering of common stock, net of costs	14,418
Redemption of Redeemable Preferred Stock	(75,735)
(Payments) proceeds from revolving lines of credit, net	(27,269)	10,038	486
Proceeds from term loan	25,000
Debt issuance costs	(714)us-gaap_PaymentsOfDebtIssuanceCosts
Principal payments on long term debt	(1,081)us-gaap_RepaymentsOfLongTermDebt	(513)us-gaap_RepaymentsOfLongTermDebt	(511)us-gaap_RepaymentsOfLongTermDebt
Principal payments on capital lease obligations	(9,364)	(6,625)	(2,956)
Payments for deferred initial public offering costs	(4,254)	(4,446)
Payments for deferred secondary public offering costs	(126)us-gaap_PaymentsOfStockIssuanceCosts
Repurchase of common stock	(5,283)
Capital contributions			2,500us-gaap_ProceedsFromContributedCapital
Net cash provided by (used in) financing activities	3,237	(1,546)	(481)
Net change in cash	6,696	167	1,370
Cash at beginning of year	4,065	3,898	2,528
Cash at end of year	10,761	4,065	3,898
Supplemental disclosures of cash flow information Net cash paid during the year for:
Interest	2,669us-gaap_InterestPaidNet	2,038us-gaap_InterestPaidNet	1,893us-gaap_InterestPaidNet
Income taxes, net of refunds	9,134us-gaap_IncomeTaxesPaidNet	8,254us-gaap_IncomeTaxesPaidNet	378us-gaap_IncomeTaxesPaidNet
Vehicles capitalized under capital leases and related lease obligations	14,583us-gaap_CapitalLeaseObligationsIncurred	17,123us-gaap_CapitalLeaseObligationsIncurred	11,090us-gaap_CapitalLeaseObligationsIncurred
Supplemental disclosure of noncash investing and financing activities
Common stock issued for acquisition of business			4,100
Seller obligations in connection with acquisition of businesses	3,544	300	571
Notes payable issued for acquisition of assets			115us-gaap_NotesIssued1
Unpaid offering costs		$ 710ibp_UnpaidOfferingCosts

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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