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Investments in and Advances to Joint Ventures - Service Fees and Income Earned by Company's Unconsolidated Joint Ventures (Detail) (Unconsolidated Joint Ventures [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Unconsolidated Joint Ventures [Member]
     
Schedule of Equity Method Investments [Line Items]      
Management and other fees $ 29.3 $ 28.6 $ 29.9
Development fees and leasing commissions 10.0 8.7 7.0
Interest income $ 16.1 $ 9.7 $ 0.1