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Income Taxes - Additional Information (Detail)	12 Months Ended
	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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- Definition

Tax year being audited in the income tax examination, in CCYY format.

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