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Accounts Payable and Accrued Expenses - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Payables And Accruals [Abstract]    
Net increase in accrued salaries and bonuses $ 28,900,000  
Accrued salaries and bonuses $ 189,439,000 $ 160,495,000