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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]    
Accrual for the probable payment of pending claims $ 17,555  
Fair Value, Inputs, Level 3
   
Loss Contingencies [Line Items]    
Fair value of contingent purchase price commitments $ 19,108 $ 18,249