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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Long Term Purchase Commitment [Line Items]  
Unconditional purchase obligations, term 4 years
Unconditional purchase obligations $ 68,530
Bank of America, N.A.  
Long Term Purchase Commitment [Line Items]  
Amount outstanding under letters of credit $ 1,007
Minimum  
Long Term Purchase Commitment [Line Items]  
Unconditional purchase obligations, term 1 year
Maximum  
Long Term Purchase Commitment [Line Items]  
Unconditional purchase obligations, term 4 years