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Income Taxes Changes in Balance of Deferred Tax Asset Valuation Allowance (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Asset Valuation Allowance [Roll Forward]      
Beginning Balance $ (1,148,268) $ (1,213,750) $ (458,288)
Additions (182,325) (24,986) (766,012)
Deductions 4,389 90,468 10,550
Ending Balance $ (1,326,204) $ (1,148,268) $ (1,213,750)