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Investments - Schedule of Company's Investments in Limited Partnerships (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Investment Securities [Line Items] |  |
Carrying Value | $ 22,716 | $ 2,550
Unfunded Balance | 22,231 | 9,860
Private US Lower Middle Market Companies [Member] |  |
Investment Securities [Line Items] |  |
Carrying Value | 4,895 | 2,550
Unfunded Balance | $ 7,549 | $ 9,860
Percentage investment held by the entity | 16.50% | 16.50%
Bank Loans Public and Private Corporate Bonds Asset Backed Securities Equity and Debt Restructuring [Member] |  |
Investment Securities [Line Items] |  |
Carrying Value | $ 3,194 |
Unfunded Balance | $ 4,682 |
Percentage investment held by the entity | 0.65% |
Equity and Debt Securities Publicly Traded US and Non US Issuers [Member] |  |
Investment Securities [Line Items] |  |
Carrying Value | $ 14,627 |
Percentage investment held by the entity | 66.78% |
Power Utility and Energy Industries and Infrastructure [Member] |  |
Investment Securities [Line Items] |  |
Unfunded Balance | $ 10,000 |

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- Definition Represents the holding of limited partnership interests for investment purposes and is accounted for using the equity method. + References No definition available. + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258 + Details
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- Definition The number of units or percentage investment held by one or more members or limited partners of the LLC or LP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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