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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Document Period End Date	Dec. 31, 2018
(Benefit) provision at U.S. federal statutory rate	$ (88,045)	$ (176,745)	$ 143,410
U.S. valuation allowance	64,529	554,551	0
Foreign earnings taxed at different rates, including foreign losses without benefit	99,598	266,587	(43,185)
U.S. Tax Act	3,709	(105,279)	0
State and local taxes, net of U.S. federal (expense) benefit	(2,028)	1,885	3,385
Adjustments to previously accrued taxes	6,621	5,159	(12,537)
Change in indefinite reinvestment assertion	14,566	0	0
Other	12,782	2,691	647
Provision for income taxes	111,732	$ 548,849	$ 91,720
Tax credit expirations	$ 8,100

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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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