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Investments Summary of Investment in Private Equity Funds (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds $ 83,669 $ 86,287
Private Equity Funds [Member]    
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 27,578 26,473
ECP II [Member] | Private Equity Funds [Member]    
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 972 983
Discovery Fund [Member] | Private Equity Funds [Member]    
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 6,928 6,632
EMCP II [Member] | Private Equity Funds [Member]    
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 6,532 6,091
EMCP III [Member] | Private Equity Funds [Member]    
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 5,776 5,786
CSI Capital [Member] | Private Equity Funds [Member]    
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 35 35
Trilantic IV [Member] | Private Equity Funds [Member]    
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds 3,152 2,829
Trilantic V [Member] | Private Equity Funds [Member]    
Schedule of Equity Method Investments [Line Items]    
Investment in private equity funds $ 4,183 $ 4,117