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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Reserve of preferred equity interests, Total Losses | $ 76,000 | $ 0 |
Fair Value Measurements [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Reserve of preferred equity interests, Fair Value Measurements | 319,300 |  |
Long-lived assets held and used, Fair Value Measurements | 14,800 |  | $ 438,200
Long-lived assets held and used, Total Losses | 22,000 |  | 110,900
Reserve of 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
Reserve of 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 |  | 0
Reserve of 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 | 14,800 |  | $ 438,200
Reserve of preferred equity interests, Fair Value Measurements | $ 319,300 |  |

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