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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

X

- Definition

Investment Securities [Line Items]

+ References

No definition available.

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- Definition

Represents the holding of limited partnership interests for investment purposes and is accounted for using the equity method.

+ References

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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

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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

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