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Investments in and Advances to Joint Ventures - Service Fees and Income Earned by Company's Unconsolidated Joint Ventures (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Schedule Of Equity Method Investments [Line Items]    
Management and other fees $ 6.1 $ 7.4
Development fees and leasing commissions 2.0 2.9
Interest income from joint ventures $ 1.7 $ 4.5