Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Joint Venture (Detail) - USD ($) $ in Thousands		3 Months Ended												12 Months Ended
		Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating results:
Total revenues		$ 119,943	$ 126,654	$ 125,926	$ 127,040	$ 112,320	$ 99,217	$ 101,504	$ 94,874	$ 70,313	$ 104,027	$ 80,717	$ 55,380	$ 499,563	$ 407,915	$ 310,437
Net income (loss)		2,651	$ (51,503)	$ (8,542)	$ 2,791	1,435	$ (4,868)	$ 3,830	$ 6,845	$ 2,707	$ 15,390	$ 8,936	$ 547	(54,603)	7,242	27,580
The Company's share of net income (loss)*														495	417	(57)
Balance sheet:
Other		31,671				14,717								31,671	14,717
Total assets		1,803,328				1,176,857								1,803,328	1,176,857
Other liabilities		23,361				31,485								23,361	31,485
Total liabilities, redeemable noncontrolling interest and equity		1,803,328				1,176,857								1,803,328	1,176,857
Investment in unconsolidated joint venture, at equity	[1]	18				363								18	363
Unconsolidated Joint Venture [Member]
Balance sheet:
Property and equipment, net		0				357								0	357
Cash		0				29								0	29
Other		0				18								0	18
Total assets		0				404								0	404
Members’ capital		0				404								0	404
Total members' capital		$ 0				$ 404								0	404
FMKT Mel JV, LLC [Member] | Investment Income (Expense) [Member]
Operating results:
The Company's share of net income (loss)*														495	417	(57)
FMKT Mel JV, LLC [Member] | Unconsolidated Joint Venture [Member]
Operating results:
Total revenues														572	540	0
Total expenses														(22)	(77)	(64)
Net income (loss)														$ 550	$ 463	$ (64)

[1] Includes the 90% share of FMKT Mel JV’s operating results.