Stockholders' Equity - Net Income (Loss) Attributable to Noncontrolling Interests (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change In Ownership Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interests	$ 34,966	$ 14,481	$ 231
Noncontrolling interests	118,936	102,744
Profits Interest Participation Rights [Member]
Change In Ownership Interest [Line Items]
Noncontrolling interests	10,792	4,049
LFI Consolidated Funds [Member]
Change In Ownership Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interests	(11,415)	7,950	2,577
Noncontrolling interests	74,164	67,299
Edgewater [Member]
Change In Ownership Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interests	31,314	10,466	(2,349)
Noncontrolling interests	44,681	44,826
LGAC [Member]
Change In Ownership Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interests	15,064	(3,940)
Noncontrolling interests	(10,714)	(13,445)
Other [Member]
Change In Ownership Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interests	3	5	$ 3
Noncontrolling interests	$ 13	$ 15