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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
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Unconsolidated Joint Ventures [Member]
       
Schedule of Equity Method Investments [Line Items]        
Management and other fees $ 7.4 $ 7.6 $ 22.6 $ 20.9
Development fees and leasing commissions 2.7 2.3 7.9 6.2
Interest income $ 5.3 $ 4.7 $ 14.4 $ 5.1