Condensed Unaudited Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 18,373		$ 14,170
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	31,753		20,954
Stock-based compensation expense	2,357		993
Excess tax benefit from stock-based compensation	(903)	[1]	(97)	[1]
Non-cash interest expense	2,239		2,128
Write-off of unamortized financing costs on redeemed debt	1,508		0
Provision for doubtful accounts	3,302		548
Provision for inventory obsolescence	284		0
Gain on sale of assets	(683)		(324)
Changes in assets and liabilities, net of assets acquired and liabilities assumed:
Accounts receivable	(28,497)		(1,724)
Inventories	12,167		216
Deferred tax assets and liabilities, net	(3,492)		10,222
Other assets, current and non-current portion	6,811		1,760
Accounts payable and accrued expenses	(4,844)		7,319
Billings in excess of costs and earnings	(19,596)		(14,335)
Other liabilities, current and non-current portion	11,289		5,855
Net cash provided by (used in) operating activities	31,816		43,445
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net, including contingent consideration	(9,656)		(4,498)
Capital expenditures	(25,851)		(14,097)
Proceeds from sale of assets	3,411		2,014
Net cash (used in) provided by investing activities	(32,096)		(16,581)
Cash flows provided by (used in) financing activities:
Proceeds from issuance of 4.875% senior notes	400,000		0
Repayment of 7.625% senior notes	(150,000)		0
Proceeds from credit facility	231,600		166,700
Repayments of credit facility	(365,600)		(195,950)
Repayments of other borrowings	(7,683)		(5,323)
(Repayments of) proceeds from book overdrafts	(5,970)		10,433
Payments of capital lease obligations	(11,438)		(4,185)
Proceeds from stock option exercises and other share-based awards	2,838		1,218
Excess tax benefit from stock-based compensation	903		97
Payments for debt extinguishment, call premiums	(4,116)		0
Payments of financing costs	(6,852)		(52)
Net cash provided by (used in) financing activities	83,682		(27,062)
Net increase (decrease) in cash and cash equivalents	83,402		(198)
Net effect of currency translation on cash	(60)		49
Cash and cash equivalents - beginning of period	26,767		20,280
Cash and cash equivalents - end of period	110,109		20,131
Cash and cash equivalents of discontinued operations	862		4,286
Cash and cash equivalents of continuing operations	109,247		15,845
Supplemental cash flow information:
Interest paid	10,720		6,423
Income taxes paid, net of refunds	8,245		1,884
Supplemental disclosure of noncash information:
Equipment acquired under capital lease	23,002		3,914
Machinery and Equipment [Member]
Supplemental disclosure of noncash information:
Equipment acquired under financing arrangements	14,569		0
Inventories [Member]
Supplemental cash flow information:
Receipt of inventory prepaid in prior year	0		12,005
Contracts Accounted for under Percentage of Completion [Member]
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for losses on construction projects, net	$ (252)		$ (4,240)

[1] Excess tax benefits, which represent cash flows from tax deductions in excess of the 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.