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Detail of Certain Balance Sheet Accounts - Accounts Payable and Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Accounts Payable And Accrued Liabilities [Line Items] |  |
Accounts payable, trade | $ 373,947 | $ 316,525
Accrued compensation and related expenses | 111,688 | 97,779
Accrued insurance, current portion | 44,503 | 48,388
Accrued loss on contracts | 4,770 | 2,771
Deferred revenues, current portion | 22,499 | 15,052
Income and franchise taxes payable | 85,663 | 47,703
Other accrued expenses | 64,215 | 42,354
Accounts payable and accrued expenses, Total | $ 707,285 | $ 570,572

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