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Fair Value and Future Funding Commitments Related to These Investments (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value written down	$ 0

X

- 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.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of write-down or reserve recognized in the income statement on real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 970



-SubTopic 360



-Section S99



-Paragraph 1



-Subparagraph (SX 210.12-28.FN5)



-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 205



-SubTopic 10



-Section S99



-Paragraph 6



-Subparagraph (SX 210.5-04.(c) Schedule III)



-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration