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Investments - Schedule of Real Estate Investment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Real Estate [Line Items]
Investment real estate, net	$ 15,792		$ 15,792		$ 24,439
Proceeds from sales of investment real estate			10,537	$ 0
Realized gains on sale of real estate investment	1,213	$ 0	1,213	$ 0
Income Producing [Member]
Real Estate [Line Items]
Investment real estate	14,679		14,679		14,619
Less: Accumulated depreciation	(1,077)		(1,077)		(870)
Investment real estate, net	13,602		13,602		13,749
Non Income Producing [Member]
Real Estate [Line Items]
Investment real estate	$ 2,190		$ 2,190		$ 10,690

X

- Definition

The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=117337411&loc=d3e23528-158515

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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

+ References

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

- Definition

The cumulative amount of depreciation for real estate property held for investment purposes.

+ References

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- Definition

Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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