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Income Taxes - Changes in Deferred Tax Asset Valuation Allowances (Detail) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |
Balance at the beginning of the year | $ (190,826) | $ (120,347) | $ (125,134)
Charged to provision for income taxes: |  |  |
Non-recoverable deferred tax assets | (7,433) | (28,208) | 0
Other state valuation allowances | (11,321) | (31,214) | 16,380
Other federal valuation allowances | 244 | 346 | 494
Other | 1,208 | 527 | 123
Balance at the end of the year | (379,019) | (190,826) | (120,347)
State |  |  |
Charged to provision for income taxes: |  |  |
Net operating loss carryforwards | (56,903) | (25,710) | (23,926)
Federal |  |  |
Charged to provision for income taxes: |  |  |
Net operating loss carryforwards | $ (113,988) | $ 13,780 | $ 11,716

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