Condensed Unaudited Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 16,068		$ 18,373
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	33,494		31,753
Non-cash interest expense, including write-off of deferred financing costs on redeemed debt	2,362		3,747
Non-cash stock-based compensation expense	3,260		2,357
Excess tax benefit from stock-based compensation	(3,246)	[1]	(903)	[1]
Provision for deferred income taxes	3,281		(3,626)
(Gains) losses on sales of assets	(1,622)		(683)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(43,440)		(28,497)
Inventories	(13,313)		12,167
Other assets, current and non-current portion	9,034		6,978
Accounts payable and accrued expenses	(14,683)		(4,844)
Billings in excess of costs and earnings	(12,247)		(19,596)
Book overdrafts	1,266		(5,970)
Other liabilities, current and non-current portion	(1,339)		11,542
Net cash (used in) provided by operating activities	(20,394)		26,130
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	(23,831)		(4,653)
Capital expenditures	(35,554)		(25,851)
Proceeds from sale of property and equipment	3,373		3,411
Payments for other investments	(1,098)		0
Net cash used in investing activities	(57,110)		(27,093)
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	233,872		231,600
Repayments of credit facility	(157,349)		(365,600)
Proceeds from issuance of senior notes	0		400,000
Repayment of senior notes	0		(150,000)
Repayments of other borrowings	(2,830)		(11,429)
Payments of capital lease obligations	(10,956)		(7,692)
Excess tax benefit from stock-based compensation	3,246		903
Payments of financing costs, including call premiums on extinguishment of debt	(218)		(10,968)
Net cash provided by financing activities	64,314		84,365
Net (decrease) increase in cash and cash equivalents	(13,190)		83,402
Net effect of currency translation on cash	(476)		(60)
Cash and cash equivalents - beginning of period	22,927		26,767
Cash and cash equivalents - end of period	9,261		110,109
Cash and cash equivalents of discontinued operations	0		862
Cash and cash equivalents of continuing operations	9,261		109,247
Supplemental cash flow information:
Interest paid	12,430		10,720
Income taxes paid, net of refunds	11,928		8,245
Supplemental disclosure of non-cash information:
Equipment acquired under capital lease	8,240		23,002
Equipment [Member]
Supplemental disclosure of non-cash information:
Equipment acquired under financing arrangements	5,780		14,569
Earn-out Arrangements [Member]
Cash flows provided by (used in) financing activities:
Payments of acquisition-related contingent consideration	0		(5,003)
Supplemental disclosure of non-cash information:
Value of acquisition-related contingent consideration	8,700		0
Stock Compensation Plan [Member]
Cash flows provided by (used in) financing activities:
Payments of tax withholdings and proceeds from stock-based awards, net	(1,451)		2,554
Payments of acquisition-related contingent consideration	1,800		3,500
Operating Expense [Member]
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for losses on operating assets	623		3,584
Contracts Accounted for under Percentage of Completion [Member]
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for losses on construction projects, net	$ 108		$ (252)

[1] Excess tax benefits, which represent cash flows from tax deductions in excess of the recorded tax effect of compensation expense recognized for stock options exercised and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows.