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v3.3.1.900

Impairment Charges and Impairment of Joint Venture Investments - Summary of Significant Unobservable Inputs (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) $ / ft² | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Range |  | 7.00% |
Range |  | 7.60% |
Fair Value Measurements [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value | $ 407.1 | $ 141.2 | $ 164.2
Fair Value | 0.0 | 6.4 | 35.3
Level 3 [Member] | Fair Value Measurements [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value | 0.0 | $ 6.4 | $ 35.3
Impairment of Consolidated Assets [Member] | Income Capitalization/Sales Comparison Approach [Member] | Level 3 [Member] | Fair Value Measurements [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Range |  | 8.00% |
Fair Value | $ 287.6 | $ 67.0 |
Impairment of Consolidated Assets [Member] | Income Capitalization/Sales Comparison Approach [Member] | Level 3 [Member] | Fair Value Measurements [Member] | Minimum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Range | 8.00% |  |
Price per Square Foot, Range | $ / ft² | 10.00 |  |
Impairment of Consolidated Assets [Member] | Income Capitalization/Sales Comparison Approach [Member] | Level 3 [Member] | Fair Value Measurements [Member] | Maximum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Range | 9.00% |  |
Price per Square Foot, Range | $ / ft² | 40.00 |  |
Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] | Level 3 [Member] | Fair Value Measurements [Member] | Minimum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Range | 10.00% |  |
Range | 8.00% |  |
Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] | Level 3 [Member] | Fair Value Measurements [Member] | Maximum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Range | 14.00% |  |
Range | 10.00% |  |
Impairment of Consolidated Assets [Member] | Indicative Bid/Contracted Price [Member] | Level 3 [Member] | Fair Value Measurements [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value | $ 33.8 | 74.2 |
Impairment of Consolidated Assets [Member] | Indicative Bid [Member] | Level 3 [Member] | Fair Value Measurements [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value | 51.5 | 0.0 |
Impairment of Consolidated Assets [Member] | Indicative Bid/Sales Comparison Approach [Member] | Level 3 [Member] | Fair Value Measurements [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value | 34.2 | $ 0.0 |
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Level 3 [Member] | Fair Value Measurements [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Range |  | 15.00% |
Range |  | 6.00% |
Fair Value | $ 0.0 | $ 6.4 |

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