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Investments Investments - Summary of Investment in Private Equity Funds (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Schedule of Equity Method Investments [Line Items] |  |
Investment in private equity funds | $ 86,532 | $ 86,287
Private Equity Funds [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in private equity funds | 19,880 | 26,473
ECP II [Member] | Private Equity Funds [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in private equity funds | 945 | 983
Discovery Fund [Member] | Private Equity Funds [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in private equity funds | 7,459 | 6,632
GMCP II [Member] | Private Equity Funds [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in private equity funds | 5,606 | 6,091
GMCP III [Member] | Private Equity Funds [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in private equity funds | 529 | 5,786
CSI Capital [Member] | Private Equity Funds [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in private equity funds | 0 | 35
Trilantic IV [Member] | Private Equity Funds [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in private equity funds | 227 | 2,829
Trilantic V [Member] | Private Equity Funds [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in private equity funds | $ 5,114 | $ 4,117

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