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Income Taxes - Difference Between Actual Income Tax Expense and Tax Provision Computed by Applying Statutory Federal Income Tax Rate to Income Before Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
(Loss) income before income tax expense:      
U.S. $ (339,072) $ (266,855) $ (241,178)
Foreign (62,942) 40,230 219,738
Worldwide (402,014) (226,625) (21,440)
Expected income tax benefit at federal statutory rate (84,423) (47,591) (7,504)
Effect of tax rate changes (74,168) 1,763 (74,294)
Mandatory repatriation of earnings pursuant to Tax Reform Act     94,194
Effect of foreign operations 3,129 15 (42,102)
Valuation allowance 11,650 11,929 (41,492)
Uncertain tax positions, settlements and adjustments relating to prior years 96,960 (15,777) 31,726
Other 2,052 3,308 (314)
Income tax benefit $ (44,800) $ (46,353) $ (39,786)