Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jan. 01, 2017
Income Tax [Line Items]
Income tax provisions (benefits)	$ 39,767	$ 27,654
Effective income tax rates	26.50%	28.10%
U.S. federal statutory income tax rate	35.00%
Adjustments for New Accounting Principle [Member]
Income Tax [Line Items]
Income tax provisions (benefits)	$ 7,356
Deferred tax assets recorded for previously unrecognized excess tax benefits on share-based payment awards			$ 81,544
Deferred tax assets, valuation allowance			$ 12,090