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Investments in and Advances to Joint Ventures - Condensed Combined Statements of Operations of Unconsolidated Joint Venture Investments (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) Property
Schedule Of Equity Method Investments [Line Items] |  |  |
Company's proportionate share of the impairment charges | $ 2,700,000 | $ 10,500,000 | $ 4,400,000
Company's share of aggregate impairment charges reclassified to discontinued operations |  |  | $ 800,000
Number of properties sold under discontinued operations | Property |  |  | 35
Investment basis value for which no income loss recognized | $ 0 |  |
Unconsolidated Joint Ventures [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Impairment charges reclassified to discontinued operations related to asset sales |  |  | $ 11,100,000
Number of properties sold under discontinued operations | Property |  |  | 37

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- Definition The proportionate share of impairment charges reclassified to discontinued operations of its equity method investee. + References No definition available. + Details
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