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Income Taxes - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019
Internal Revenue Service [Member] | Earliest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax year subject to examination | 2016
Internal Revenue Service [Member] | Latest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax year subject to examination | 2019
Virginia Department of Taxation [Member] | Earliest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax year subject to examination | 2016
Virginia Department of Taxation [Member] | Latest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax year subject to examination | 2019

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