Significant Accounting Policies (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Costs and estimated earnings in excess of billings related to the entity's contracts and joint venture contracts [Abstract]
Unbilled costs and profits incurred to date	$ 116,900,000	$ 107,645,000
Unapproved change orders	108,747,000	136,704,000
Claims	149,289,000	114,049,000
Total	374,936,000	358,398,000
Unapproved change orders and claims subject to pending litigation	$ 65,800,000	$ 85,200,000