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Accounts Payable And Accrued Expenses (Narrative) (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
The net decrease in accrued salaries and bonuses $ 16,000  
Accrued salaries and bonuses $ 131,593 $ 147,613