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Investments (Limited Partnership Investments) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule Of Investments [Line Items]
Recognized investment income (loss)	$ 689	$ 476	$ (2,058)	$ 1,308
Return on investment			650	3,647
Limited Partnership [Member]
Schedule Of Investments [Line Items]
Cash distributions	850	724	1,742	4,810
Return on investment	72	$ 31	650	$ 3,647
Company's net cumulative contributed capital to the partnership	28,976		28,976		$ 27,117
Maximum exposure loss relating to VIE	$ 27,497		$ 27,497		$ 28,346

X

- Definition

Represents the amount of cumulative cash contribution to acquire limited partnership interest as of the reporting date.

+ References

No definition available.

+ Details

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- Definition

Distributions from limited partnership for return on investment.

+ References

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its limited partnership interests to which the equity method of accounting is applied and the holding of these interests is for investment purposes.

+ References

No definition available.

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- Definition

Amount of cash distribution paid to unit-holder of limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5747-111685

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5728-111685

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