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 |