Business Segments, Reportable Segments Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended											12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Segment Reporting Information [Abstract]
Total Revenues												$ 4,194,119		$ 3,927,436		$ 3,288,132
Elimination of intersegment revenues												(82,648)		(211,119)		(88,922)
Revenues from external customers												4,111,471		3,716,317		3,199,210
(Loss) Income from Construction Operations [Abstract]
Before impairment charge												154,763
Impairment charge				(376,574)								(376,574)		0		0
(LOSS) INCOME FROM CONSTRUCTION OPERATIONS	60,724		54,676	(354,174)	[1]	16,963	50,792		62,036	37,035	18,513	(221,811)		168,376		172,312
Assets	3,296,410						3,613,127					3,296,410		3,613,127		2,779,220
Capital Expenditures												43,402		68,351		32,920
Building [Member]
Segment Reporting Information [Abstract]
Total Revenues												1,478,508		1,952,030		2,300,574
Elimination of intersegment revenues												(10,598)		(126,562)		(77,059)
Revenues from external customers												1,467,910		1,825,468		2,223,515
(Loss) Income from Construction Operations [Abstract]
Before impairment charge												(4,098)
Impairment charge												(282,608)
(LOSS) INCOME FROM CONSTRUCTION OPERATIONS												(286,706)		46,262		89,236
Assets	669,780						1,125,632					669,780		1,125,632		1,152,439
Capital Expenditures												1,682		1,293		4,069
Civil [Member]
Segment Reporting Information [Abstract]
Total Revenues												1,290,610		896,896		670,172
Elimination of intersegment revenues												(42,329)		(11,651)		(3,043)
Revenues from external customers												1,248,281		885,245		667,129
(Loss) Income from Construction Operations [Abstract]
Before impairment charge												112,584
Impairment charge												(65,503)
(LOSS) INCOME FROM CONSTRUCTION OPERATIONS												47,081		78,546		88,122
Assets	1,046,712						1,102,471					1,046,712		1,102,471		626,396
Capital Expenditures												27,037		49,892		25,638
Specialty Contractors [Member]
Segment Reporting Information [Abstract]
Total Revenues												1,183,518		802,535		112,860
Elimination of intersegment revenues												(481)		(75)		0
Revenues from external customers												1,183,037		802,460		112,860
(Loss) Income from Construction Operations [Abstract]
Before impairment charge												79,080
Impairment charge												(11,489)
(LOSS) INCOME FROM CONSTRUCTION OPERATIONS												67,591		65,582		6,281
Assets	672,074						597,986					672,074		597,986		80,502
Capital Expenditures												10,201		4,727		108
Management Services [Member]
Segment Reporting Information [Abstract]
Total Revenues												241,483		275,975		204,526
Elimination of intersegment revenues												(29,240)		(72,831)		(8,820)
Revenues from external customers												212,243		203,144		195,706
(Loss) Income from Construction Operations [Abstract]
Before impairment charge												12,291
Impairment charge												(16,974)
(LOSS) INCOME FROM CONSTRUCTION OPERATIONS												(4,683)		22,322		22,153
Assets	180,145						182,583					180,145		182,583		147,921
Capital Expenditures												1,791		8,020		1,997
Total Reportable Segments [Member]
Segment Reporting Information [Abstract]
Total Revenues												4,194,119		3,927,436		3,288,132
Elimination of intersegment revenues												(82,648)		(211,119)		(88,922)
Revenues from external customers												4,111,471		3,716,317		3,199,210
(Loss) Income from Construction Operations [Abstract]
Before impairment charge												199,857
Impairment charge												(376,574)
(LOSS) INCOME FROM CONSTRUCTION OPERATIONS												(176,717)		212,712		205,792
Assets	2,568,711						3,008,672					2,568,711		3,008,672		2,007,258
Capital Expenditures												40,711		63,932		31,812
Corporate [Member]
Segment Reporting Information [Abstract]
Total Revenues												0		0		0
Elimination of intersegment revenues												0		0		0
Revenues from external customers												0		0		0
(Loss) Income from Construction Operations [Abstract]
Before impairment charge												(45,094)	[2]
Impairment charge												0
(LOSS) INCOME FROM CONSTRUCTION OPERATIONS												(45,094)	[2]	(44,336)	[2]	(33,480)	[2]
Assets	727,699	[3]					604,455	[3]				727,699	[3]	604,455	[3]	771,962	[3]
Capital Expenditures												$ 2,691		$ 4,419		$ 1,108

[1] Includes pre-tax goodwill and intangible asset impairment of $376.6 million.

[2] Primarily consists of corporate general and administrative expenses.

[3] Principally consists of cash and cash equivalents, corporate transportation equipment, construction equipment, and other investments available for general corporate purposes.