Description of Business and Summary of Significant Accounting Policies (Details 2) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Use of and Changes in Estimates
Income from construction operations	$ 70,175,000	$ 58,094,000	$ 39,474,000	$ 36,079,000	$ 60,724,000	$ 54,676,000	$ (354,174,000)	$ 16,963,000	$ 203,822,000	$ (221,811,000)	$ 168,376,000
Net income	33,259,000	23,759,000	15,478,000	14,800,000	41,635,000	42,591,000	(348,423,000)	(1,203,000)	87,296,000	(265,400,000)	86,148,000
Diluted earnings per common share (in dollars per share)	$ 0.68	$ 0.49	$ 0.32	$ 0.31	$ 0.86	$ 0.88	$ (7.35)	$ (0.03)	$ 1.80	$ (5.59)	$ 1.80
Increase in the estimated recovery projected for Building segment project
Use of and Changes in Estimates
Impact on results of operations									13,800,000
Income from construction operations									13,800,000
Net income									8,600,000
Diluted earnings per common share (in dollars per share)									$ 0.18
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
Income from construction operations										12,400,000
Net income										$ 7,500,000
Diluted earnings per common share (in dollars per share)										$ 0.16