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Income Taxes - Schedule of Cash Distributions to Stockholders for Federal Income Tax Purposes (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2020
$ / shares
One Year Amounts [Member]  
Income Taxes [Line Items]  
Capital gain distributions $ 0.205429
Three Year Amounts [Member]  
Income Taxes [Line Items]  
Capital gain distributions $ 0.205429