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Income Taxes - Summary of Changes to Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefit at the beginning of the year $ 8,861 $ 7,835 $ 5,897
Additions based on tax positions related to the current year 859 1,050 1,664
Additions based on tax positions related to the prior year 1,144 391 221
Reductions as a result of lapse of applicable statute of limitations (76) (40) (20)
Reductions as a result of foreign exchange rates and other (429) (375) 73
Unrecognized tax benefits at the end of the year $ 10,359 $ 8,861 $ 7,835