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Cost Saving Initiatives - Activity Related to Obligations Pursuant to Cost Saving Initiatives (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]  
Beginning Balance $ 17,216us-gaap_RestructuringReserve
Settlements (12,701)us-gaap_PaymentsForRestructuring
Ending Balance 4,515us-gaap_RestructuringReserve
Accrued Compensation and Benefits [Member]  
Restructuring Cost and Reserve [Line Items]  
Beginning Balance 11,860us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= laz_AccruedCompensationAndBenefitsMember
Settlements (11,651)us-gaap_PaymentsForRestructuring
/ us-gaap_BalanceSheetLocationAxis
= laz_AccruedCompensationAndBenefitsMember
Ending Balance 209us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= laz_AccruedCompensationAndBenefitsMember
Other Liabilities [Member]  
Restructuring Cost and Reserve [Line Items]  
Beginning Balance 5,356us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
Settlements (1,050)us-gaap_PaymentsForRestructuring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
Ending Balance $ 4,306us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember