Cost paid for title services.

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Number of investments with capitalized costs.

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Performance participation allocation.

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Related party transaction portfolio company incentive compensation awards.

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Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

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Related Party Transactions - Additional Information (Detail) $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	Apr. 30, 2019 shares	Jan. 31, 2019 USD ($) shares	Mar. 31, 2019 USD ($) Investment shares	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Total components due to affiliates			$ 317,970		$ 301,581
Management fee			$ 17,177	$ 6,969
Stock repurchased \| shares			4,204,000
Stock repurchased, value			$ 45,510	2,296
Recognized liabilities for Performance Participation expense			20,163	$ 7,873
Portfolio company incentive compensation awards		$ 8,000			4,700
Amoritzation period of grant		4 years
Unrecognized compensation cost relating to portfolio company incentive compensation awards			$ 7,500
Unrecognized compensation cost recognition period			3 years 9 months 18 days
Class I Shares [Member]
Related Party Transaction [Line Items]
Stock issued as payment for services \| shares		400,000
Stock repurchased \| shares			1,751,000
Adviser [Member]
Related Party Transaction [Line Items]
Percentage of management fee on NAV per annum			1.25%
Stock repurchased, value			$ 5,400		3,400
Special Limited Partner [Member] \| Class I Shares [Member]
Related Party Transaction [Line Items]
Stock issued as payment for services \| shares		3,500,000
Stock redeemed, shares \| shares		400,000
Stock redeemed, value		$ 4,300
Stock exchanged, shares \| shares		1,100,000
LNLS [Member]
Related Party Transaction [Line Items]
Costs paid to LNLS for title services related to investments			$ 100
Number of Investments with Capitalized Costs \| Investment			2
Accrued Stockholder Servicing Fee [Member]
Related Party Transaction [Line Items]
Total components due to affiliates			$ 275,432		238,496
Advanced Organization and Offering Costs [Member]
Related Party Transaction [Line Items]
Total components due to affiliates			7,670		8,181
Advanced Expenses [Member]
Related Party Transaction [Line Items]
Total components due to affiliates			1,000		1,100
Accrued Management Fee [Member]
Related Party Transaction [Line Items]
Total components due to affiliates			6,069		$ 5,124
Accrued Management Fee [Member] \| Adviser [Member]
Related Party Transaction [Line Items]
Total components due to affiliates			$ 6,100
Management Fee [Member] \| Adviser [Member] \| Class I Shares [Member]
Related Party Transaction [Line Items]
Stock issued as payment for services \| shares			1,021,790
Stock repurchased \| shares			1,425,427
Stock repurchased, value			$ 15,500
Management Fee [Member] \| Subsequent Event [Member] \| Adviser [Member] \| Class I Shares [Member]
Related Party Transaction [Line Items]
Stock issued as payment for services \| shares	555,647