Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Goodwill [Roll Forward]
Gross goodwill				$ 788,818,000
Accumulated impairment				(166,898,000)
Balance at beginning of period		892,602,000	892,602,000	621,920,000
Goodwill recorded in connection with the acquisition of Fisk, Anderson, Lunda GreenStar and Becho				270,682,000
Reallocation based on relative fair value				0	[1]
Acquisition related adjustments			(869,000)
Impairment charge	(321,100,000)		(321,087,000)
Balance at end of period			570,646,000	892,602,000		621,920,000
Goodwill and Intangible Asset Impairment [Abstract]
Implied market control premium (in hundredths)		42.50%		78.10%
Number of years an acceptable range of market transactions have been observed in the construction and engineering industry			7 years
Indefinite lived intangible assets impairment charge	16,400,000
Finite lived intangible assets impairment charge	39,100,000
Total intangible assets [Abstract]
Cost			311,456,000	308,890,000
Accumulated amortization			(71,568,000)	(53,311,000)
Accumulated impairment charge			(113,067,000)	(57,580,000)
Carrying value			126,821,000	197,999,000
Amortization Expense [Abstract]
Amortization expense			18,300,000	13,100,000		8,100,000
Amortization expense, 2013			13,100,000
Amortization expense, 2014			11,900,000
Amortization expense, 2015			5,300,000
Amortization expense, 2016			3,500,000
Amortization expense, 2017			3,500,000
Amortization expense, thereafter			39,100,000
Trade Names (Amortizable) [Member]
Finite-Lived Intangible Assets [Abstract]
Cost			74,350,000	74,350,000
Accumulated amortization			(3,854,000)	(788,000)
Accumulated impairment charge			(23,232,000)	(800,000)
Carrying value			47,264,000	72,762,000
Weighted average amortization period			20 years	20 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Abstract]
Cost			39,800,000	39,800,000
Accumulated amortization			(13,029,000)	(10,585,000)
Accumulated impairment charge			(16,645,000)	0
Carrying value			10,126,000	29,215,000
Weighted average amortization period			11 years 4 months 24 days	11 years 7 months 6 days
Construction Contract Backlog [Member]
Finite-Lived Intangible Assets [Abstract]
Cost			73,706,000	71,140,000
Accumulated amortization			(54,685,000)	(41,938,000)
Accumulated impairment charge			0	0
Carrying value			19,021,000	29,202,000
Weighted average amortization period			3 years 7 months 6 days	2 years 10 months 24 days
Trade Names (Non-amortizable) [Member]
Indefinite-Lived Intangible Assets [Abstract]
Cost			117,600,000	117,600,000
Accumulated amortization			0	0
Accumulated impairment charge			(67,190,000)	(56,100,000)
Carrying value			50,410,000	61,500,000
Weighted average amortization period			Indefinite	Indefinite
Contractor License [Member]
Indefinite-Lived Intangible Assets [Abstract]
Cost			6,000,000	6,000,000
Accumulated amortization			0	0
Accumulated impairment charge			(6,000,000)	(680,000)
Carrying value			0	5,320,000
Weighted average amortization period			Indefinite	Indefinite
Minimum [Member]
Goodwill and Intangible Asset Impairment [Abstract]
Weighted-average cost of capital rate (in hundredths)			15.00%
Maximum [Member]
Goodwill and Intangible Asset Impairment [Abstract]
Weighted-average cost of capital rate (in hundredths)			16.50%
Building [Member]
Goodwill [Roll Forward]
Gross goodwill				402,926,000
Accumulated impairment				(146,847,000)
Balance at beginning of period		273,420,000	273,420,000	256,079,000
Goodwill recorded in connection with the acquisition of Fisk, Anderson, Lunda GreenStar and Becho				140,907,000
Reallocation based on relative fair value				(123,566,000)	[1]
Acquisition related adjustments			0
Impairment charge			(262,918,000)
Balance at end of period			10,502,000	273,420,000
Building [Member] | Minimum [Member]
Goodwill [Roll Forward]
Percentage of fair value in excess of carrying amount (in hundredths)			10.00%
Civil [Member]
Goodwill [Roll Forward]
Gross goodwill				319,254,000
Accumulated impairment				0
Balance at beginning of period		430,762,000	430,762,000	319,254,000
Goodwill recorded in connection with the acquisition of Fisk, Anderson, Lunda GreenStar and Becho				129,775,000
Reallocation based on relative fair value				(18,267,000)	[1]
Acquisition related adjustments			(869,000)
Impairment charge			(55,740,000)
Balance at end of period			374,153,000	430,762,000
Civil [Member] | Minimum [Member]
Goodwill [Roll Forward]
Percentage of fair value in excess of carrying amount (in hundredths)			10.00%
Specialty Contractors [Member]
Goodwill [Roll Forward]
Gross goodwill				0
Accumulated impairment				0
Balance at beginning of period		141,833,000	141,833,000	0
Goodwill recorded in connection with the acquisition of Fisk, Anderson, Lunda GreenStar and Becho				0
Reallocation based on relative fair value				141,833,000	[1]
Acquisition related adjustments			0
Impairment charge			0
Balance at end of period			141,833,000	141,833,000
Specialty Contractors [Member] | Minimum [Member]
Goodwill [Roll Forward]
Percentage of fair value in excess of carrying amount (in hundredths)			10.00%
Management Services [Member]
Goodwill [Roll Forward]
Gross goodwill				66,638,000
Accumulated impairment				(20,051,000)
Balance at beginning of period		46,587,000	46,587,000	46,587,000
Goodwill recorded in connection with the acquisition of Fisk, Anderson, Lunda GreenStar and Becho				0
Reallocation based on relative fair value				0	[1]
Acquisition related adjustments			0
Impairment charge			(2,429,000)
Balance at end of period			$ 44,158,000	$ 46,587,000
Percentage of fair value in excess of carrying amount (in hundredths)			4.50%

[1] During the third quarter of 2011, the Company completed a reorganization which resulted in the formation of the Specialty Contractors reporting unit and reportable segment. The Specialty Contractors reporting unit consists of the following subsidiary companies: WDF, FSE, Nagelbush, Fisk, Desert Mechanical, Inc. ("DMI") (all previously included in the Building reporting unit), and Superior Gunite (previously included in the Civil reporting unit). The reorganization enabled the Company to focus on vertical integration through increased self-performed work capabilities, while maintaining the specialty contractors business with third parties, and strengthened the Company's position as a full-service contractor with greater control over scheduled delivery and risk management. The Company reallocated goodwill between its reorganized reporting units based on a relative fair value assessment in accordance with the guidance on segment reporting.