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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Income taxes $ 244 $ (195) $ 368
Percentage of ordinary income 89.20% 100.00% 61.60%
Capital gain distributions percentage 10.80% 0.00% 34.40%
Non-taxable distributions percentage 0.00% 0.00% 4.00%
Percentage of taxable income distributed among stockholders 90.00%