Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended						12 Months Ended			12 Months Ended
	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Civil	Dec. 31, 2011 Civil	Dec. 31, 2013 Civil	Dec. 31, 2012 Building	Dec. 31, 2011 Building	Dec. 31, 2013 Building	Dec. 31, 2013 Specialty Contractors	Dec. 31, 2011 Specialty Contractors	Dec. 31, 2012 Management Services	Dec. 31, 2013 Management Services	Dec. 31, 2011 Management Services	Dec. 31, 2010 Management Services	Dec. 31, 2013 Management Services Minimum
Goodwill
Balance at beginning of period		$ 570,646	$ 892,602	$ 788,818	$ 430,762	$ 319,254	$ 374,153	$ 273,420	$ 402,926	$ 10,502	$ 141,833		$ 46,587	$ 44,158		$ 66,638
Accumulated Impairment				(166,898)					(146,847)						(20,051)
Goodwill recorded in connection with an acquisition		7,110		270,682		129,775			140,907		7,110
Reallocation based on relative fair value						(18,267)			(123,566)			141,833
Acquisition related adjustments			(869)		(869)
Impairment charge	(321,100)		(321,087)		(55,740)			(262,918)					(2,429)
Balance at end of period		$ 577,756	$ 570,646	$ 892,602	$ 374,153	$ 430,762	$ 374,153	$ 10,502	$ 273,420	$ 10,502	$ 148,943	$ 141,833	$ 44,158	$ 44,158		$ 66,638
Percentage of fair value in excess of carrying amount (in hundredths)																	10.00%