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Impairment Charges and Reserves - Impairment Charges and Reserves Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-lived assets held and used, Total Impairment Charges | $ 600 | $ 5,800 | $ 58,200
Preferred equity interests, Total Impairment Charges | 15,544 | 11,422 | 61,000
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 | 5,000 | 51,500 | 307,100
Assets included in the spin-off of RVI, Fair Value Measurements |  | 1,028,000 | 1,249,000
Preferred equity interests, Fair Value Measurements | 108,500 | 185,500 | 272,000
Long-lived assets held and used, Total Impairment Charges | 3,400 | 6,700 | 73,300
Assets included in the spin-off of RVI, Total Impairment Charges |  | 62,600 | 267,200
Preferred equity interests, Total Impairment Charges | 15,500 | 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
Preferred equity interests, Fair Value Measurements | 0 | 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
Preferred equity interests, Fair Value Measurements | 0 | 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 | 5,000 | 51,500 | 307,100
Assets included in the spin-off of RVI, Fair Value Measurements |  | 1,028,000 | 1,249,000
Preferred equity interests, Fair Value Measurements | $ 108,500 | $ 185,500 | $ 272,000

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