Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Joint Venture (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Operating results:
Total revenues		$ 125,926	$ 101,504	$ 252,966	$ 196,378
Net income (loss)		(8,542)	3,830	(5,751)	10,675
The Company's share of net income (loss)*				495	(50)
Balance sheet:
Other		28,796		28,796		$ 14,717
Total assets		1,280,703		1,280,703		1,176,857
Other liabilities		48,737		48,737		31,485
Total liabilities, redeemable noncontrolling interest and equity		1,280,703		1,280,703		1,176,857
Investment in unconsolidated joint venture, at equity	[1]	858		858		363
Unconsolidated Joint Venture [Member]
Balance sheet:
Property and equipment, net		0		0		357
Cash		953		953		29
Other		18		18		18
Total assets		971		971		404
Other liabilities		17		17		0
Members’ capital		954		954		404
Total liabilities, redeemable noncontrolling interest and equity		971		971		$ 404
Unconsolidated Joint Venture [Member] | FMKT Mel JV, LLC [Member]
Operating results:
Total revenues		572		572
Total expenses		(8)	(28)	(22)	(56)
Net income (loss)		564	(28)	550	(56)
Operating Expense [Member] | FMKT Mel JV, LLC [Member]
Operating results:
The Company's share of net income (loss)*	[2]	$ 508	$ (25)	$ 495	$ (50)

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

[2] Included in net investment income in the Company’s consolidated statements of income.