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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Commitments And Contingencies [Line Items]    
Lease or rental expense $ 3.7 $ 3.1
Minimum [Member]    
Commitments And Contingencies [Line Items]    
Operating leases of property and equipment from third parties 5 years  
Maximum [Member]    
Commitments And Contingencies [Line Items]    
Operating leases of property and equipment from third parties 30 years