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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal tax computed at U.S. statutory income tax rate									$ 143,251	$ 224,384	$ 210,040
Enactment of the 2017 Tax Act					$ 550,000				(6,059)	550,000
Foreign currency exchange impact on distributed earnings									7,495
GILTI, net of foreign tax credits									13,727
Settlement of tax audits										706	345
State income tax, net of federal income tax benefit									2,910	1,289	2,008
Net effect of foreign operations									(66,092)	(134,117)	(133,518)
Effect of stock-based compensation									(9,089)	(19,566)
Other, net									2,209	(1,910)	(264)
Provision for income taxes	$ 12,654	$ 28,216	$ 18,884	$ 28,598	$ 578,910	$ 17,696	$ 16,250	$ 7,930	$ 88,352	$ 620,786	$ 78,611

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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