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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |
Federal net operating loss carryforward expiration year | 2033 |
State net operating loss carryforward expiration year | 2020 |
Valuation allowance related to tax law changes |  | $ 2.3
State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
State NOL carryforwards |  | $ 3.4
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards | $ 794.4 |
Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Gross tax credits | $ 8.1 |
Tax carryforward period | 20 years |
Tax credit carryforward expiration year | 2034 |
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards | $ 629.3 |

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