Income Taxes (Details) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of Income (Loss) Before Taxes [Abstract]
U.S. Operations		$ (271,683,000)	$ 133,501,000	$ 159,474,000
Foreign Operations		3,841,000	3,546,000	(6,000)
(Loss) income before income taxes		(267,842,000)	137,047,000	159,468,000
Current Expense [Abstract]
Federal		19,573,000	30,848,000	49,873,000
State		3,508,000	6,303,000	9,528,000
Foreign		1,542,000	1,325,000	175,000
Total current		24,623,000	38,476,000	59,576,000
Deferred (Benefit) Expense [Abstract]
Federal		(28,157,000)	16,351,000	(2,464,000)
State		1,104,000	(3,718,000)	(983,000)
Foreign		(12,000)	(210,000)	(161,000)
Total deferred		(27,065,000)	12,423,000	(3,608,000)
Total (benefit) provision		(2,442,000)	50,899,000	55,968,000
Reconciliation of Provision (Benefit) for Income Taxes [Abstract]
Federal income expense (benefit) at statutory tax rate		(93,745,000)	47,963,000	55,814,000
State income taxes, net of federal tax benefit		3,214,000	2,529,000	5,060,000
Officers' compensation		1,473,000	224,000	495,000
Goodwill impairment		89,191,000	0	0
Other		(2,575,000)	183,000	(5,401,000)
Total (benefit) provision		(2,442,000)	50,899,000	55,968,000
Reconciliation of Effective Income Tax Rate [Abstract]
Federal income expense (benefit) at statutory tax rate (in hundredths)		35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit (in hundredths)		(1.20%)	1.80%	3.20%
Officers' compensation (in hundredths)		(0.60%)	0.20%	0.30%
Goodwill impairment (in hundredths)		(33.30%)	0.00%	0.00%
Other (in hundredths)		1.00%	0.10%	(3.40%)
(Benefit) provision for income taxes (in hundredths)		0.90%	37.10%	35.10%
Goodwill and intangible assets impairment	376,574,000	376,574,000	0	0
Impairment of goodwill and intangible assets that yielded permanent tax differences		255,000,000
Reduction in provision for income taxes as a result of goodwill impairment		50,200,000
Deferred Tax Assets [Abstract]
Timing of expense recognition		28,448,000	39,830,000
Net operating losses		5,517,000	5,440,000
Other, net		8,763,000	1,219,000
Deferred tax assets		42,728,000	46,489,000
Valuation allowance		(2,817,000)	0
Net deferred tax assets		39,911,000	46,489,000
Deferred Tax Liabilities [Abstract]
Intangible assets, due primarily to purchase accounting		(26,768,000)	(73,020,000)
Fixed assets, due primarily to purchase accounting		(76,095,000)	(66,406,000)
Construction contract accounting		(5,613,000)	(4,910,000)
Joint ventures - construction		(7,038,000)	(4,276,000)
Other		(390,000)	38,000
Deferred tax liabilities		(115,904,000)	(148,574,000)
Net deferred tax liability		(75,993,000)	(102,085,000)
Net Deferred Tax Liability [Abstract]
Current deferred tax asset		10,071,000	0
Long-term deferred tax asset		29,840,000	0
Current deferred tax liability		(6,004,000)	(4,164,000)
Long-term deferred tax liability		(109,900,000)	(97,921,000)
Net deferred tax liability		(75,993,000)	(102,085,000)
Increase in valuation allowance		2,800,000
Unremitted earnings of foreign subsidiaries		14,300,000	15,300,000
Reconciliation of gross unrecognized tax benefits [Roll Forward]
Net increase in tax liabilities		2,000,000
Related interest net of federal tax liability included in tax liabilities		200,000
Gross unrecognized tax expense balance at January 1:		2,043,000	1,150,000	1,308,000
Add: [Abstract]
Additions based on tax positions related to current year		1,281,000	875,000	0
Additions/reductions for tax positions of prior years		1,857,000	47,000	56,000
Less: [Abstract]
Reductions for tax positions of prior years (expiration of statute of limitations)		(1,158,000)	(29,000)	(214,000)
Gross unrecognized tax expense balance at end of period		4,023,000	2,043,000	1,150,000
Interest expense related to unrecognized tax benefit		$ 200,000