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Income Taxes - Carryforwards Available to Reduce Future Income Taxes (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
U.S. Federal  
Carryforward Available To Reduce Future Income Taxes [Line Items]  
Net operating loss, Tax Credit Carryforward, Amount $ 899,953
State Taxes  
Carryforward Available To Reduce Future Income Taxes [Line Items]  
Net operating loss, Tax Credit Carryforward, Amount 1,552,582
Interest expense, Tax Credit Carryforward, Amount 264,878
Years Of Expiration Carryforward Unlimited  
Carryforward Available To Reduce Future Income Taxes [Line Items]  
Net operating loss, Tax Credit Carryforward, Amount 6,492
Interest expense, Tax Credit Carryforward, Amount $ 262,069