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Summary of Disposition of Property's (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Copper Mill
Real Estate Properties [Line Items]
Gain (loss) on sale related to property includes defeasance costs	$ 4,251
Cumberland Glen
Real Estate Properties [Line Items]
Gain (loss) on sale related to property includes defeasance costs		$ 1,343

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- Definition

Gains losses on sales of investment real estate defeasance costs.

+ References

No definition available.

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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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- Details

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Period Type:

X

- Details

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Period Type: