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Stockholders' Equity - Net Income (Loss) Attributable to Noncontrolling Interests and Noncontrolling Interests at the End of the Period (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
Change In Ownership Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interests	$ (3,829)	$ 1,738	$ 3,270	$ 5,264
Noncontrolling interests	111,295		111,295		$ 102,744
Profits Interest Participation Rights [Member]
Change In Ownership Interest [Line Items]
Noncontrolling interests	9,293		9,293		4,049
LFI Consolidated Funds [Member]
Change In Ownership Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interests	(10,405)	2,420	(13,156)	4,688
Noncontrolling interests	67,551		67,551		67,299
Edgewater [Member]
Change In Ownership Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interests	3,518	1,874	10,506	3,330
Noncontrolling interests	46,015		46,015		44,826
LGAC [Member]
Change In Ownership Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interests	3,058	(2,558)	5,918	(2,758)
Noncontrolling interests	(11,576)		(11,576)		(13,445)
Other [Member]
Change In Ownership Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interests		$ 2	2	$ 4
Noncontrolling interests	$ 12		$ 12		$ 15

X

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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