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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%

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