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Investments Summary of Other Equity Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Equity method investment $ 77,577 $ 67,560
G5 Evercore [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity method investment 35,328 20,001
ABS [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity method investment $ 42,249 $ 47,559