Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Recent Accounting Pronouncements [Line Items]
Tax benefit related to the excess tax benefit from stock based compensation	$ (200,840)	$ 17,075	$ 9,101
Cumulative-effect adjustment	131,273
ASU 2016-09
Recent Accounting Pronouncements [Line Items]
Tax benefit related to the excess tax benefit from stock based compensation	15,100
Cumulative-effect adjustment	$ 131,273
Reclassified tax benefits from financing activities to operating activities		$ 2,200	$ 1,500