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Impairment Charges and Impairment of Joint Venture Investments - Summary of Significant Unobservable Inputs (Detail) (Level 3 [Member], Fair Value Measurements [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Fair Value $ 75.5 $ 44.1
Valuation Technique Income Capitalization Approach Income Capitalization Approach
Unobservable Input Market Capitalization Rate Market Capitalization Rate
Unobservable Input Price Per Square Foot Price Per Square Foot
Impairment of Consolidated Assets [Member] | Indicative Bid/Contracted Price [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Fair Value 85.7 136.6
Valuation Technique Indicative Bid/ Contracted Price Indicative Bid/ Contracted Price
Unobservable Input Indicative Bid/ Contracted Price Indicative Bid/ Contracted Price
Impairment of Joint Venture Investments [Member] | Income Capitalization Approach [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Fair Value 35.3 4.7
Valuation Technique Income Capitalization Approach Income Capitalization Approach
Unobservable Input Market Capitalization Rate Market Capitalization Rate
Range    8.00%
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Fair Value 35.3 4.7
Valuation Technique Discounted Cash Flow Discounted Cash Flow
Unobservable Input Discount Rate Discount Rate
Unobservable Input Terminal Capitalization Rate Terminal Capitalization Rate
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Discount Rates [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range   11.00%
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Terminal Capitalization Rate [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range     
Deconsolidated Joint Venture Investment [Member] | Discounted Cash Flow [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Fair Value 0 56.1
Valuation Technique Discounted Cash Flow Discounted Cash Flow
Unobservable Input Discount Rate Discount Rate
Deconsolidated Joint Venture Investment [Member] | Discounted Cash Flow [Member] | Discount Rates [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range     
Impairment of Consolidated Assets - Held for Sale [Member] | Indicative Bid [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Fair Value $ 3.0 $ 0
Valuation Technique Indicative Bid Indicative Bid
Unobservable Input Indicative Bid Indicative Bid
Minimum [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Market Capitalization Rate [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range 8.00% 8.00%
Minimum [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Price Per Square Foot [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range (per square foot) 12 15
Minimum [Member] | Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Discount Rates [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range 8.00%  
Minimum [Member] | Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Terminal Capitalization Rate [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range   5.50%
Minimum [Member] | Deconsolidated Joint Venture Investment [Member] | Discounted Cash Flow [Member] | Discount Rates [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range   8.00%
Maximum [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Market Capitalization Rate [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range 10.00% 12.00%
Maximum [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Price Per Square Foot [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range (per square foot) 117 47
Maximum [Member] | Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Discount Rates [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range 15.00%  
Maximum [Member] | Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Terminal Capitalization Rate [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range   8.50%
Maximum [Member] | Deconsolidated Joint Venture Investment [Member] | Discounted Cash Flow [Member] | Discount Rates [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range   15.00%