Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reportable segment information
Total revenues	$ 1,084,369	$ 999,671	$ 2,142,704	$ 1,929,147
Elimination of intersegment revenues	(31,304)	(14,325)	(96,711)	(31,267)
Revenues from external customers	1,053,065	985,346	2,045,993	1,897,880
Income from construction operations
Before impairment charge		22,400		39,363
Impairment charge		(376,574)		(376,574)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	39,474	(354,174)	75,553	(337,211)
Building
Reportable segment information
Total revenues	422,366	331,924	847,480	674,963
Elimination of intersegment revenues	(20,542)	(1,664)	(32,017)	(3,909)
Revenues from external customers	401,824	330,260	815,463	671,054
Income from construction operations
Before impairment charge		(14,487)		(23,384)
Impairment charge		(282,608)		(282,608)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	3,024	(297,095)	7,261	(305,992)
Civil
Reportable segment information
Total revenues	332,223	327,072	616,198	577,661
Elimination of intersegment revenues	(10,515)	(3,376)	(61,803)	(4,592)
Revenues from external customers	321,708	323,696	554,395	573,069
Income from construction operations
Before impairment charge		25,762		42,604
Impairment charge		(65,503)		(65,503)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	29,199	(39,741)	50,753	(22,899)
Specialty Contractors
Reportable segment information
Total revenues	284,036	275,902	585,913	543,638
Elimination of intersegment revenues			(10)	(298)
Revenues from external customers	284,036	275,902	585,903	543,340
Income from construction operations
Before impairment charge		19,868		39,616
Impairment charge		(11,489)		(11,489)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	15,985	8,379	35,271	28,127
Management Services
Reportable segment information
Total revenues	45,744	64,773	93,113	132,885
Elimination of intersegment revenues	(247)	(9,285)	(2,881)	(22,468)
Revenues from external customers	45,497	55,488	90,232	110,417
Income from construction operations
Before impairment charge		1,852		3,738
Impairment charge		(16,974)		(16,974)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	2,112	(15,122)	4,918	(13,236)
Total Reportable Segments
Reportable segment information
Total revenues	1,084,369	999,671	2,142,704	1,929,147
Elimination of intersegment revenues	(31,304)	(14,325)	(96,711)	(31,267)
Revenues from external customers	1,053,065	985,346	2,045,993	1,897,880
Income from construction operations
Before impairment charge		32,995		62,574
Impairment charge		(376,574)		(376,574)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	50,320	(343,579)	98,203	(314,000)
Corporate
Income from construction operations
Before impairment charge		(10,595)		(23,211)
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	$ (10,846)	$ (10,595)	$ (22,650)	$ (23,211)