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Investments - Schedule of Company's Investments in Limited Partnerships (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Investment Securities [Line Items]
Carrying Value	$ 27,497	$ 28,346
Unfunded Balance	12,178	15,130
Private US Lower Middle Market Companies [Member]
Investment Securities [Line Items]
Carrying Value	8,879	9,659
Unfunded Balance	$ 2,085	$ 2,085
Percentage investment held by the entity	15.37%	15.37%
Bank Loans Public and Private Corporate Bonds Asset Backed Securities Equity and Debt Restructuring [Member]
Investment Securities [Line Items]
Carrying Value	$ 5,633	$ 5,985
Percentage investment held by the entity	1.76%	1.76%
Power Utility and Energy Industries and Infrastructure [Member]
Investment Securities [Line Items]
Carrying Value	$ 6,640	$ 9,188
Unfunded Balance	$ 1,401	$ 1,391
Percentage investment held by the entity	0.18%	0.18%
Senior and Junior Debts of Private Equity-Backed Companies [Member]
Investment Securities [Line Items]
Carrying Value	$ 4,355	$ 1,602
Unfunded Balance	$ 406	$ 3,106
Percentage investment held by the entity	0.47%	0.47%
Mature Real Estate Private Equity Funds And Portfolio Globally [Member]
Investment Securities [Line Items]
Carrying Value	$ 1,990	$ 1,912
Unfunded Balance	$ 8,286	$ 8,548
Percentage investment held by the entity	2.24%	2.24%

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- Definition

Investment Securities [Line Items]

+ References

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- Definition

Represents the holding of limited partnership interests for investment purposes and is accounted for using the net asset value information provided by general partners to estimate fair value.

+ 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258

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- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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