Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jan. 01, 2017
Income Tax [Line Items]
Income tax provisions	$ 51,600	$ 31,872	$ 91,367	$ 59,526
Effective income tax rates	29.90%	28.10%	28.30%	28.10%
U.S. federal statutory income tax rate			35.00%
Adjustments for New Accounting Principle [Member]
Income Tax [Line Items]
Income tax provisions			$ 8,269
Deferred tax assets recorded for previously unrecognized excess tax benefits on share-based payment awards					$ 81,544
Deferred tax assets, valuation allowance					$ 12,090