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Income Taxes - Narrative (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |
Current tax benefit related to CARES Act | $ 9,700,000 |
Valuation allowance | 0 | $ 0
Liability for uncertain tax position | $ 0 | $ 0

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