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Summary of Disposition of Property's (Parenthetical) (Detail) $ in Thousands | 9 Months Ended
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Sep. 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
Period Type: | duration

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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: |