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Summary of Disposition of Property's (Parenthetical) (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Copper Mill
Real Estate Properties [Line Items]
Gain (loss) on sale related to property includes defeasance costs	$ 2,748

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- Definition

Gains losses on sales of investment real estate defeasance costs.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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.

+ References

No definition available.

+ Details

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

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: