Other Current Liabilities - Summary of Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Accrued expenses	$ 15,534	$ 19,616
Salaries, bonuses, commissions and related taxes payable	19,636	18,190
Accrued legal and settlement expenses	23,081	22,608
Non-income taxes payable	7,301	1,428
Other payables	3,536	3,755
Total	$ 69,088	$ 65,597