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Impairment Charges and Reserves - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-lived assets held and used, Fair Value Measurements | $ 403,400 |
Preferred equity interests, Fair Value Measurements | 223,200 |
Preferred equity interests, Total Losses | 2,336 | $ 76,000
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 | 403,400 |
Preferred equity interests, Fair Value Measurements | 223,200 |
Long-lived assets held and used, Total Losses | 48,500 |
Preferred equity interests, Total Losses | 2,300 |
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 |
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] |  |
Long-lived assets held and used, Fair Value Measurements | 0 |
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] |  |
Long-lived assets held and used, Fair Value Measurements | 403,400 |
Preferred equity interests, Fair Value Measurements | $ 223,200 |

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