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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
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