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Impairment Charges and Reserves - Impairment Charges on Assets or Investments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Impairment Charges And Impairment Of Joint Venture Investments [Abstract] |  |  |  |
Assets marketed for sale | $ 5,800 | $ 8,500 | $ 54,300 | $ 49,500
Assets included in the spin-off of RVI | 14,100 | 0 | 14,100 | 0
Reserve (adjustment) of preferred equity interests | 2,201 | (15,377) | 4,537 | 60,623
Total impairment charges | 22,100 | (5,100) | 72,900 | 121,000
Undeveloped Land [Member] |  |  |  |
Impairment Charges And Impairment Of Joint Venture Investments [Abstract] |  |  |  |
Undeveloped land | $ 0 | $ 1,800 | $ 0 | $ 10,900

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