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Income Taxes - Schedule of Activity Related to Gross Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Balance at beginning of year $ 17,165 $ 14,902 $ 13,072
Increases related to prior year tax positions 467 40 338
Decreases related to prior year tax positions (1,168)   (38)
Increases related to current year tax positions 3,675 3,750 2,955
Decreases related to lapse of statutes of limitations (1,692) (1,527) (1,425)
Balance at end of year $ 18,447 $ 17,165 $ 14,902