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Income Taxes - Summary of Changes in Deferred Tax Assets Valuation Allowance (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |
Beginning Balance | $ 88,953 | $ 82,210 | $ 76,486
Charged (credited) to provision for income taxes | 5,220 | 8,742 | 4,598
Charged (credited) to other comprehensive income and other | (5,934) | (1,999) | 1,126
Ending Balance | $ 88,239 | $ 88,953 | $ 82,210

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- Definition Changes to deferred tax asset valuation account due to changes in the income tax provision (benefit) balances. + References No definition available. + Details
Name: | laz_DeferredTaxAssetValuationAllowanceChangesDueToChangesInIncomeTaxProvisionBenefitBalances
Namespace Prefix: | laz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Changes to deferred tax valuation account due to charges (credits) to other comprehensive income and other. + References No definition available. + Details
Name: | laz_DeferredTaxValuationAllowanceChangesDueToChargesCreditsToOtherComprehensiveIncomeAndOther
Namespace Prefix: | laz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration