Investments - Summary of Geographic Composition of Investments at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Summary Of Investment Holdings [Line Items]
Fair Value	$ 1,566,045	[1],[2],[3]	$ 1,262,956	$ 1,262,956
Percentage of Fair Value	100.00%		100.00%	100.00%
United States
Summary Of Investment Holdings [Line Items]
Fair Value	$ 1,401,895		$ 1,111,350
Percentage of Fair Value	89.60%		88.10%
UNITED KINGDOM
Summary Of Investment Holdings [Line Items]
Fair Value	$ 61,765		$ 58,591
Percentage of Fair Value	3.90%		4.60%
CANADA
Summary Of Investment Holdings [Line Items]
Fair Value	$ 37,029		$ 31,890
Percentage of Fair Value	2.40%		2.50%
Australia
Summary Of Investment Holdings [Line Items]
Fair Value	$ 19,441		$ 19,490
Percentage of Fair Value	1.20%		1.50%
Netherlands
Summary Of Investment Holdings [Line Items]
Fair Value	$ 17,185		$ 15,352
Percentage of Fair Value	1.10%		1.20%
Belgium
Summary Of Investment Holdings [Line Items]
Fair Value	$ 14,568		$ 14,166
Percentage of Fair Value	0.90%		1.10%
SWEDEN
Summary Of Investment Holdings [Line Items]
Fair Value	$ 14,162		$ 12,117
Percentage of Fair Value	0.90%		1.00%

[1] All debt investments are income-producing, unless otherwise noted. Equity and member interests are non-income-producing unless otherwise noted. The Company generally acquires its investments in private transactions exempt from registration under the Securities Act. Its investments are therefore generally subject to certain limitations on resale, and may be deemed to be “restricted securities” under the Securities Act.

[2] All positions held are non-controlled/non-affiliated investments, unless otherwise noted, as defined by the 1940 Act. Non-controlled/non-affiliated investments are investments that are neither controlled nor affiliated.

[3] The fair value of the investment was determined using significant unobservable inputs unless otherwise noted, as defined by the 1940 Act. See Note 2 “Summary of Significant Accounting Policies”.