Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Disclosure Summary Of Accrued Expenses And Other Current Liabilities [Abstract]
Taxes payable	$ 16,752	$ 19,472
Bonuses and commissions	54,465	67,259
Accrued compensation	34,760	30,816
Other employee related liabilities	31,926	28,812
Other	35,605	25,277
Total accrued expenses and other current liabilities	$ 173,508	$ 171,636