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Derivatives - Fair Value of Derivatives Reported on Condensed Consolidated Statements of Financial Condition (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 275 $ 682
Derivative Liabilities 219,172 164,001
Forward Foreign Currency Exchange Rate Contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 275 250
Derivative Liabilities 1,046 1,579
Total Return Swaps and Other [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets   432
Derivative Liabilities 4,688  
Lazard Fund Interests and Other Similar Deferred Compensation Arrangements [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ 213,438 $ 162,422