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Fair Value Measurements - Summary of Changes in Fair Value of Company's Level 3 Assets (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance $ 115,533us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 116,101us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 133,100us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Net Unrealized/Realized Gains (Losses) Included In Revenue-Other 8,431us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 13,373us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 16,118us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Purchases/Acquisitions 9,283us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases 7,261us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases 8,599us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Sales/Dispositions (11,290)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales (22,815)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales (42,670)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
Foreign Currency Translation Adjustments (6,172)laz_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetForeignCurrencyTranslationAdjustments 1,613laz_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetForeignCurrencyTranslationAdjustments 954laz_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetForeignCurrencyTranslationAdjustments
Ending Balance 115,785us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue 115,533us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue 116,101us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Equities [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 1,340us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
190us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
211us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
Net Unrealized/Realized Gains (Losses) Included In Revenue-Other 19us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
11us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
5us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
Purchases/Acquisitions   1,095us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
 
Sales/Dispositions (1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
  (30)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
Foreign Currency Translation Adjustments (43)laz_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetForeignCurrencyTranslationAdjustments
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
44laz_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetForeignCurrencyTranslationAdjustments
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
4laz_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetForeignCurrencyTranslationAdjustments
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
Ending Balance 1,315us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
1,340us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
190us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= laz_EquitiesMember
Alternative Investment Funds [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance   3,457us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= laz_AlternativeInvestmentsMember
10,171us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= laz_AlternativeInvestmentsMember
Net Unrealized/Realized Gains (Losses) Included In Revenue-Other   117us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_InvestmentTypeAxis
= laz_AlternativeInvestmentsMember
130us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_InvestmentTypeAxis
= laz_AlternativeInvestmentsMember
Sales/Dispositions   (3,574)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= laz_AlternativeInvestmentsMember
(6,844)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= laz_AlternativeInvestmentsMember
Ending Balance     3,457us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= laz_AlternativeInvestmentsMember
Equity Funds [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance   10us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
 
Purchases/Acquisitions     10us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
Sales/Dispositions   (10)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
 
Ending Balance     10us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
Private Equity Funds [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 114,193us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
112,444us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
122,718us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
Net Unrealized/Realized Gains (Losses) Included In Revenue-Other 8,412us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
13,245us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
15,983us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
Purchases/Acquisitions 9,283us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
6,166us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
8,589us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
Sales/Dispositions (11,289)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
(19,231)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
(35,796)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
Foreign Currency Translation Adjustments (6,129)laz_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetForeignCurrencyTranslationAdjustments
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
1,569laz_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetForeignCurrencyTranslationAdjustments
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
950laz_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetForeignCurrencyTranslationAdjustments
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
Ending Balance $ 114,470us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
$ 114,193us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
$ 112,444us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember