Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accrued Liabilities, Current [Abstract]
Accrued payroll	$ 158,006	$ 130,400
Taxes payable	35,122	25,617
Other employee related liabilities	60,889	44,284
Other	76,229	52,956
Total accrued expenses and other current liabilities	$ 330,246	$ 253,257	[1]

[1] As adjusted to reflect the impact of the full retrospective adoption of Topic 606.