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Historical Estimated NAV Per Share, Including the Prices Pursuant to the Reinvestment Plan and the Company's Monthly Cash Distributions per Share (Detail) - $ / shares
Mar. 31, 2017
Feb. 13, 2017
Dividends Payable [Line Items]    
NAV per Share $ 10.04 $ 9.75
Monthly Cash Distributions 0.0353 0.0353
Reinvestment Plan    
Dividends Payable [Line Items]    
Reinvestment Plan Price per Share $ 10.04 $ 9.75