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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
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity Method Investments And Joint Ventures [Abstract]      
Management and other fees $ 26.0 $ 24.9 $ 29.3
Development fees and leasing commissions 6.8 6.4 10.0
Interest income $ 26.0 $ 11.0 $ 16.1