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Impairment Charges and Reserves - Reserves Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred equity interests, Total Impairment Charges | $ 19,393 | $ 12,106
Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred equity interests, Fair Value Measurements | 94,200 |
Fair Value Measurements [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred equity interests, Fair Value Measurements | 0 |
Fair Value Measurements [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred equity interests, Fair Value Measurements | 0 |
Fair Value Measurements [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred equity interests, Fair Value Measurements | $ 94,200 |

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- Definition Reserve of preferred equity interests. + References No definition available. + Details
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