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Income Taxes - Components of Loss From Continuing Operations Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
United States $ (153,290) $ (61,259) $ (403,161)
Foreign 114,266 (52,147) (7,258)
Loss before income taxes $ (39,024) $ (113,406) [1] $ (410,419) [1]
[1] As adjusted to reflect the impact of the full retrospective adoption of Topic 606.