Equity - Summary of Class A Common Stock Issuances (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	May 31, 2013	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Shares issued (in shares)	25,875,000		2,311,711	20,363,592	10,842,746
Net proceeds			$ 70,651	$ 638,005	$ 278,322
Shares issued for management and incentive fees					19,300
Manager
Class of Stock [Line Items]
Shares issued for management and incentive fees					$ 19,300
Shares issued for management and incentive fees (in shares)					840,696
ATM Agreement
Class of Stock [Line Items]
Number of shares sold (in shares)		840,696	2,303,469	296,901
Price per share sold (in dollars per share)		$ 22.93		$ 33.67
Class A Common Stock
Class of Stock [Line Items]
Shares issued (in shares)			2,303,469	20,361,408	10,840,696
Gross issue price per share (in dollars per share)			$ 31.23	$ 31.64	$ 27.79
Net issue price per share (in dollars per share)			$ 30.92	$ 31.37	$ 27.52
Net proceeds			$ 70,651	$ 638,005	$ 297,599
Class A Common Stock | Manager
Class of Stock [Line Items]
Shares issued for management and incentive fees (in shares)					840,696