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Impairment Charges and Reserves - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Preferred equity interests, Total Impairment Charges | $ 11,422 | $ 61,000 | $ 0
Fair Value Measurements [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-lived assets held and used, Fair Value Measurements | 51,500 | 307,100 | 215,700
Assets included in the spin-off of RVI, Fair Value Measurements | 1,028,000 | 1,249,000 | 222,500
Preferred equity interests, Fair Value Measurements | 185,500 | 272,000 |
Long-lived assets held and used, Total Impairment Charges | 6,700 | 73,300 | 67,400
Assets included in the spin-off of RVI, Total Impairment Charges | 62,600 | 267,200 | 43,500
Preferred equity interests, Total Impairment Charges | 11,400 | 61,000 |
Fair Value Measurements [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-lived assets held and used, Fair Value Measurements | 0 | 0 | 0
Assets included in the spin-off of RVI, Fair Value Measurements | 0 | 0 | 0
Preferred equity interests, Fair Value Measurements | 0 | 0 |
Fair Value Measurements [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-lived assets held and used, Fair Value Measurements | 0 | 0 | 0
Assets included in the spin-off of RVI, Fair Value Measurements | 0 | 0 | 0
Preferred equity interests, Fair Value Measurements | 0 | 0 |
Fair Value Measurements [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-lived assets held and used, Fair Value Measurements | 51,500 | 307,100 | 215,700
Assets included in the spin-off of RVI, Fair Value Measurements | 1,028,000 | 1,249,000 | $ 222,500
Preferred equity interests, Fair Value Measurements | $ 185,500 | $ 272,000 |

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