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Investments in and Advances to Joint Ventures - Condensed Combined Financial Information of Company's Unconsolidated Joint Venture Investments (Parenthetical) (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule Of Equity Method Investments [Line Items] |  |
Redeemable preferred equity, net | $ 204,078 | $ 277,776
PIK [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Redeemable preferred equity, net | $ 10,800 | $ 6,300

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