Organization and Basis of Presentation - Additional Information (Detail) $ in Thousands		1 Months Ended	9 Months Ended
	Feb. 04, 2019	Feb. 28, 2021 USD ($)	Sep. 30, 2022 USD ($) Segment	Dec. 31, 2021 USD ($)
Organization And Basis Of Presentation [Line Items]
Governing operating agreement, date	Feb. 04, 2019
Number of business segments | Segment			2
Redeemable noncontrolling interests			$ 578,495	$ 575,000
LGAC [Member]
Organization And Basis Of Presentation [Line Items]
LGAC IPO		$ 575,000
Redeemable noncontrolling interests			$ 578,495
LGAC [Member] | Net Underwriting Fee [Member]
Organization And Basis Of Presentation [Line Items]
Net underwriting fee associated with the IPO of a special purpose acquisition company		8,500
LGAC [Member] | Non-cash Deferred Underwriting Fees [Member]
Organization And Basis Of Presentation [Line Items]
Deferred costs associated with IPO of special purpose acquisition entity		20,125
LGAC [Member] | Other Offering Cost [Member]
Organization And Basis Of Presentation [Line Items]
Other offering costs associated with IPO of special purpose acquisition entity		$ 852
Lazard Group LLC [Member]
Organization And Basis Of Presentation [Line Items]
Percentage of common membership interests held			100.00%	100.00%