Significant Accounting Policies (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Use of and Changes in Estimates
Income from construction operations	$ 58,094,000	$ 54,676,000	$ 133,647,000	$ (282,535,000)
NET INCOME (LOSS)	23,759,000	42,591,000	54,037,000	(307,035,000)
Diluted earnings per common share (in dollars per share)	$ 0.49	$ 0.88	$ 1.11	$ (6.47)
Increase in the estimated recovery projected for Building segment project
Use of and Changes in Estimates
Impact on results of operations	9,700,000		11,500,000
Income from construction operations	9,700,000		11,500,000
NET INCOME (LOSS)	6,200,000		7,200,000
Diluted earnings per common share (in dollars per share)	$ 0.13		$ 0.15
Increase in the estimated recovery projected for large hospitality and gaming project
Use of and Changes in Estimates
Impact on results of operations		12,400,000		12,400,000
Income from construction operations		12,400,000		12,400,000
NET INCOME (LOSS)		$ 7,200,000		$ 7,200,000
Diluted earnings per common share (in dollars per share)		$ 0.15		$ 0.15