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Net Gains (Losses) With Respect to Derivative Instruments Not Designated as Hedging Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivatives not designated as hedging instruments $ (15,576) $ 22,532 $ (19,983) $ 10,414
Foreign Exchange Forward
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivatives not designated as hedging instruments (3,377) 6,541 (1,248) (2,856)
Lazard Fund Interests And Other Similar Deferred Compensation Arrangements
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivatives not designated as hedging instruments (4,728) 3,961 (4,639) 3,961
Equity And Fixed Income Swaps And Other
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivatives not designated as hedging instruments $ (7,471) $ 12,030 $ (14,096) $ 9,309