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Income Taxes Changes in Balance of Deferred Tax Asset Valuation Allowance (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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)

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- Definition Deferred Tax Assets Valuation Allowance, Decrease + References No definition available. + Details
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- Definition Deferred Tax Assets Valuation Allowance, Increase + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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