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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
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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

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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