Distributions - Declared on GAAP Basis (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Amount	$ 2,091,351	$ 1,235,971
% of Cash Distributions Declared	100.00%	100.00%
Investment Company, Expense Offset Arrangement	$ 607,630	$ 216,073
Net Investment Income
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Amount	$ 1,645,964	$ 1,130,385
% of Cash Distributions Declared	78.70%	91.50%
Investment Company, Expense Offset Arrangement	$ 607,630	$ 216,073
Distributions in excess of net investment income
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Amount	$ 445,387	$ 105,586
% of Cash Distributions Declared	21.30%	8.50%
Class FA
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Amount	$ 1,407,473	$ 1,020,708
Class A
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Amount	223,612	75,454
Class T
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Amount	60,942	10,024
Class D
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Amount	88,027	36,428
Class I
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Amount	$ 311,297	$ 93,357