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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
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Fair Value $ 67.0 $ 75.5
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] | Income Capitalization Approach [Member] | Market Capitalization Rate [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range 8.00%  
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Minimum | Market Capitalization Rate [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range   8.00%
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Maximum [Member] | Market Capitalization Rate [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range   10.00%
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Price Per Square Foot [Member] | Minimum
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range   12
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Price Per Square Foot [Member] | Maximum [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range   117
Impairment of Consolidated Assets [Member] | Indicative Bid/Contracted Price [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Fair Value 15.6 88.7
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] | Discounted Cash Flow [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Fair Value $ 26.8 $ 35.3
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] | Terminal Capitalization Rate [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range 6.00% 6.00%
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Minimum | Discount Rates [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range 8.00% 8.00%
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Maximum [Member] | Discount Rates [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Range 15.00% 15.00%