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Impairment Charges and Reserves - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Preferred equity interests, Total Losses | $ (15.4) | $ 0.0 | $ 60.6 | $ 0.0
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 | 141.0 |  | 141.0 |
Preferred equity interests, Fair Value Measurements | 327.3 |  | 327.3 |
Long-lived assets held and used, Total Losses |  |  | 60.4 |
Preferred equity interests, Total Losses |  |  | 60.6 |
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 |  | 0.0 |
Preferred equity interests, Fair Value Measurements | 0.0 |  | 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 |  | 0.0 |
Preferred equity interests, Fair Value Measurements | 0.0 |  | 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 | 141.0 |  | 141.0 |
Preferred equity interests, Fair Value Measurements | $ 327.3 |  | $ 327.3 |

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