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Investments Summary of Investment in Private Equity Funds (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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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

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