Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jan. 01, 2017
Income Taxes [Line Items]
Unrecognized tax benefits					$ 1,000
Impact of unrecognized tax benefits if recognized					$ 1,000
Period of expiration of the statute of limitations for certain jurisdictions			Within the next twelve months
Jurisdictions statutes of limitations expiration period			12 months
Income tax benefits	$ (74,992)	$ (88,175)	$ (286,774)	$ (306,577)
ASU 2016-09
Income Taxes [Line Items]
Income tax benefits	1,000		$ 9,000
Excess tax benefit from share based compensation		$ 1,000		$ 36,000
Minimum
Income Taxes [Line Items]
Foreign and U.S. state and local jurisdictions have statutes of limitations, in years			3 years
Maximum
Income Taxes [Line Items]
Accrued interest and penalties	$ 1,000		$ 1,000
Foreign and U.S. state and local jurisdictions have statutes of limitations, in years			4 years