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Investments Summary of Other Equity Investments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Equity Method Investments [Line Items] |  |
Investment in private equity funds | $ 60,966 | $ 67,560
G5 Evercore [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in private equity funds | 19,306 | 20,001
ABS [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in private equity funds | $ 41,660 | $ 47,559

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