Stockholders' Equity - Additional Information (Details) - USD ($)						3 Months Ended		9 Months Ended		88 Months Ended
	Oct. 24, 2022	Mar. 13, 2020	Mar. 04, 2020	Apr. 30, 2018	Jun. 15, 2016	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Class Of Stock [Line Items]
Common stock, shares, issued						25,674,313		25,674,313		25,674,313		25,549,319
Common stock, shares, outstanding						25,674,313		25,674,313		25,674,313		25,549,319
Common stock, par value					$ 0.01	$ 0.01		$ 0.01		$ 0.01		$ 0.01
Share repurchase program, authorized amount	$ 100,000,000	$ 100,000,000.0		$ 40,000,000.0	$ 30,000,000.0
Stock repurchase program period in force	2 years			2 years	2 years
Stock repurchase program, expiration date	Oct. 24, 2024	Mar. 12, 2023		Jun. 15, 2020	Jun. 15, 2018
Share repurchase program, treasury stock shares								0		2,550,628
Share repurchase program, treasury stock, value							$ 5,991,000		$ 11,127,000	$ 72,400,000
Share repurchase program, treasury stock, per share										$ 28.36
Aggregate sale price of common stock							$ (76,000)		3,992,000
Shares issued average price per share			$ 53.55
Proceeds from issuance of common stock			$ 62,310,967,000						$ 3,992,000
Common Stock
Class Of Stock [Line Items]
Common stock, shares, issued						25,674,313	25,549,036	25,674,313	25,549,036	25,674,313	25,674,313	25,549,319	25,647,942	25,500,567
Common stock, shares, retired							98,906		168,473
Aggregate sale price of common stock									$ 1,000
Restricted Stock Units
Class Of Stock [Line Items]
Restricted stock units, granted								260,709
Unvested units						627,611		627,611		627,611		527,926
2020 At-the-Market Offering
Class Of Stock [Line Items]
Shares, issued								0	52,091
Shares issued average price per share									$ 83.16
Proceeds from issuance of common stock									$ 4,300,000
Stock issuance costs									100,000
Other stock issuance costs									300,000
2020 At-the-Market Offering | Common Stock
Class Of Stock [Line Items]
Common stock, par value			$ 0.01
2020 At-the-Market Offering | Maximum | Common Stock
Class Of Stock [Line Items]
Aggregate sale price of common stock			$ 225,000,000
2016 LTIP
Class Of Stock [Line Items]
Common stock, shares, issued								124,994
Common stock, shares, issued						982,204		982,204		982,204
2016 LTIP | Restricted Stock Units
Class Of Stock [Line Items]
Unvested units						627,611		627,611		627,611		527,926
Equity-based compensation expense						$ 2,500,000	$ 2,000,000.0	$ 7,000,000.0	$ 5,900,000
Dividends earned on restricted stock units						$ 1,800,000		$ 1,800,000		$ 1,800,000
2016 LTIP | Restricted Stock Units | Director
Class Of Stock [Line Items]
Vesting period description								annually
2016 LTIP | Minimum | Restricted Stock Units | Officers, Employees and Certain Key Employees of Adviser
Class Of Stock [Line Items]
Restricted stock units, vesting period								3 years
2016 LTIP | Maximum | Restricted Stock Units | Officers, Employees and Certain Key Employees of Adviser
Class Of Stock [Line Items]
Restricted stock units, vesting period								5 years