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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Long-term Purchase Commitment [Line Items]      
Operating lease expiration period 2020-09    
Rent expense $ 13,245 $ 12,479 $ 13,686
Minimum rental payments under capital leases 631    
Minimum rental payments under operating leases 22,219    
Minimal rental payments under operating leases, net of sublease payments 2,369    
Unconditional purchase obligations over next six years $ 43,317    
Minimum      
Long-term Purchase Commitment [Line Items]      
Operating lease term 1 year    
Unconditional purchase obligations 1 year    
Maximum      
Long-term Purchase Commitment [Line Items]      
Operating lease term 10 years    
Unconditional purchase obligations 4 years