Annual report pursuant to Section 13 and 15(d)

Detail of Certain Balance Sheet Accounts - Contracts in Progress (Detail)

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Detail of Certain Balance Sheet Accounts - Contracts in Progress (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Contracts In Progress Costs And Earnings [Line Items]    
Costs incurred on contracts in progress $ 3,744,337 $ 2,257,719
Estimated earnings, net of estimated losses 612,000 270,113
Cost and estimated earnings, total 4,356,337 2,527,832
Less - Billings to date (4,187,445) (2,483,264)
Cost and estimated earnings, Net 168,892 44,568
Costs and estimated earnings in excess of billings on uncompleted contracts 342,777 189,167
Less - Billings in excess of costs and estimated earnings on uncompleted contracts $ (173,885) $ (144,599)