CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Operations [Abstract]
Revenues	$ 4,111,471	$ 3,716,317	$ 3,199,210
Cost of operations	3,696,339	3,320,976	2,861,362
Gross profit	415,132	395,341	337,848
General and administrative expenses	260,369	226,965	165,536
Goodwill and intangible assets impairment	376,574	0	0
(LOSS) INCOME FROM CONSTRUCTION OPERATIONS	(221,811)	168,376	172,312
Other (expense) income, net	(1,857)	4,421	(2,280)
Interest expense	(44,174)	(35,750)	(10,564)
(Loss) income before income taxes	(267,842)	137,047	159,468
Benefit (provision) for income taxes	2,442	(50,899)	(55,968)
NET (LOSS) INCOME	$ (265,400)	$ 86,148	$ 103,500
BASIC (LOSS) EARNINGS PER COMMON SHARE (in dollars per share)	$ (5.59)	$ 1.82	$ 2.15
DILUTED (LOSS) EARNINGS PER COMMON SHARE (in dollars per share)	$ (5.59)	$ 1.80	$ 2.13
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
BASIC (in shares)	47,470	47,226	48,111
Effect of dilutive stock options and restricted stock units (in shares)	0	664	538
DILUTED (in shares)	47,470	47,890	48,649