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Investments Summary of Investment in Private Equity Funds (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds $ 77,577 $ 67,560
Private Equity Funds [Member]
   
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 34,241 32,379
ECP II [Member] | Private Equity Funds [Member]
   
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 3,125 3,251
Discovery Fund [Member] | Private Equity Funds [Member]
   
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 2,545 5,015
EMCP II [Member] | Private Equity Funds [Member]
   
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 12,531 11,125
EMCP III [Member] | Private Equity Funds [Member]
   
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 5,394 3,852
CSI Capital [Member] | Private Equity Funds [Member]
   
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 3,778 3,248
Trilantic IV [Member] | Private Equity Funds [Member]
   
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 5,264 4,356
Trilantic V [Member] | Private Equity Funds [Member]
   
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds $ 1,604 $ 1,532