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Impairment Charges and Reserves - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Preferred equity interests, Total Losses | $ 0 | $ 76,000 | $ 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 | 59,500 | 59,500 |
Preferred equity interests, Fair Value Measurements | 319,300 | 319,300 |
Long-lived assets held and used, Total Losses |  | 50,100 |
Preferred equity interests, Total Losses |  | 76,000 |
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 |
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 |
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 | 59,500 | 59,500 |
Preferred equity interests, Fair Value Measurements | $ 319,300 | $ 319,300 |

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