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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
Mar. 31, 2013
Mar. 31, 2012
Unconsolidated Joint Ventures [Member]
   
Schedule of Equity Method Investments [Line Items]    
Management and other fees $ 7.4 $ 6.8
Development fees and leasing commissions 2.9 2.0
Interest income $ 4.5 $ 0