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Income Taxes - Expiration of Loss and Tax Credit Carryforwards (Detail) $ in Thousands	Dec. 31, 2020 USD ($)
Operating Loss and Tax Credit Carryforward [Line Items]
Loss Carryforward	$ 694,591
Tax Credit Carryforward	71,409
2021–2025
Operating Loss and Tax Credit Carryforward [Line Items]
Loss Carryforward	36,337
Tax Credit Carryforward	496
Thereafter
Operating Loss and Tax Credit Carryforward [Line Items]
Loss Carryforward	250,810
Tax Credit Carryforward	47,287
No expiration date
Operating Loss and Tax Credit Carryforward [Line Items]
Loss Carryforward	407,444
Tax Credit Carryforward	$ 23,626