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)	$ (17,887)us-gaap_NetIncomeLoss	$ (923)us-gaap_NetIncomeLoss	$ 16,244us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	13,606us-gaap_Depreciation	13,272us-gaap_Depreciation	16,240us-gaap_Depreciation
Impairment of goodwill	16,066us-gaap_GoodwillImpairmentLoss
Loss on sale of business	13,497
Impairment of fixed assets		27,500us-gaap_TangibleAssetImpairmentCharges
Amortization of intangible assets	540us-gaap_AmortizationOfIntangibleAssets	27us-gaap_AmortizationOfIntangibleAssets	27us-gaap_AmortizationOfIntangibleAssets
Amortization of debt issuance costs	377us-gaap_AmortizationOfFinancingCosts	634us-gaap_AmortizationOfFinancingCosts	1,318us-gaap_AmortizationOfFinancingCosts
Provision for doubtful accounts	70	(1,063)	98
Deferred income taxes	2,894us-gaap_DeferredIncomeTaxExpenseBenefit	(7,994)us-gaap_DeferredIncomeTaxExpenseBenefit	(4,120)us-gaap_DeferredIncomeTaxExpenseBenefit
Loss on disposal of property and equipment	489	256	998
Stock-based compensation expense	2,946us-gaap_ShareBasedCompensation	3,060us-gaap_ShareBasedCompensation	3,048us-gaap_ShareBasedCompensation
Excess tax benefit from stock compensation plans	(553)
Adjustments to contingent consideration	(1,746)
Other, net	12us-gaap_OtherNoncashIncomeExpense	54us-gaap_OtherNoncashIncomeExpense	216us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of acquired assets and assumed liabilities
Trade and other receivables, net	7,984	(24,212)	28,298
Costs and estimated earnings in excess of billings on uncompleted contracts, net	4,088	19,736	(36,621)
Inventories	6,039us-gaap_IncreaseDecreaseInInventories	8,261us-gaap_IncreaseDecreaseInInventories	(5,582)us-gaap_IncreaseDecreaseInInventories
Refundable income taxes	(3,405)	(1,073)
Prepaid expenses and other assets	754	307	5,480
Accounts payable	(5,273)	1,374	(310)
Deferred revenue	(4,573)	(3,901)	7,764
Accrued and other liabilities	(881)	(15,226)	11,392
Net cash provided by operating activities	35,044	20,089	44,490
Cash flows from investing activities:
Additions to property and equipment	(14,289)	(28,447)	(16,789)
Proceeds from sale of business	29,791
Acquisition of businesses, net of cash acquired		(15,689)
Proceeds from sale of property and equipment	8	1,711	1,072
Issuance of notes receivable		(5,700)	(1,000)
Restricted cash			(2,640)
Other investing activities	31	(126)	60
Net cash provided by (used in) investing activities	15,541	(48,251)	(19,297)
Cash flows from financing activities:
Proceeds from issuance of common stock	28	72	37
Tax withholdings related to net share settlements of restricted share awards and performance shares	(1,283)	(802)	(212)
Excess tax benefit from stock compensation plans	553
Payments on long-term debt	(6,357)us-gaap_RepaymentsOfLongTermDebt	(5,714)us-gaap_RepaymentsOfLongTermDebt	(5,714)us-gaap_RepaymentsOfLongTermDebt
Borrowings on line of credit	230,581	220,721	119,000
Repayments on line of credit	(272,913)	(180,334)	(133,468)
Payments of debt issuance costs			(1,599)us-gaap_PaymentsOfDebtIssuanceCosts
Payments on capital lease obligations	(1,255)	(5,239)	(3,373)
Net cash (used in) provided by financing activities	(50,646)	28,704	(25,329)
Change in cash and cash equivalents	(61)	542	(136)
Cash and cash equivalents, beginning of period	588	46	182
Cash and cash equivalents, end of period	527	588	46
Supplemental disclosure of cash flow information:
Cash paid during the period for interest, net of amounts capitalized	2,271us-gaap_InterestPaidNet	3,277us-gaap_InterestPaidNet	4,353us-gaap_InterestPaidNet
Cash paid during the period for income taxes (net of refunds of $393, $311, and $1,834)	1,982us-gaap_IncomeTaxesPaidNet	9,592us-gaap_IncomeTaxesPaidNet	5,007us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activities:
Escrow account related to capital lease financing			898
Accrued property and equipment purchases	1,243	1,656	2,777
Capital lease additions	$ 804us-gaap_CapitalLeaseObligationsIncurred		$ 142us-gaap_CapitalLeaseObligationsIncurred

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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-Name Accounting Standards Codification

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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