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Income Taxes - Reconciliation of Provision for Income Taxes at US Federal Statutory Rate to Provision in Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
(Benefit) provision at U.S. federal statutory rate	$ (176,745)	$ 143,410	$ 162,370
U.S. valuation allowance	554,551	0	0
Foreign earnings taxed at different rates, including withholding taxes	265,112	(51,711)	(56,877)
U.S. Tax Reform	(105,279)	0	0
Foreign losses without income tax benefit	1,475	8,526	5,843
State and local taxes, net of U.S. federal benefit	1,885	3,385	482
Adjustments to previously accrued taxes	5,159	(12,537)	(19,134)
Other	2,691	647	1,815
Provision for income taxes	$ 548,849	$ 91,720	$ 94,499

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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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