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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
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Equity Method Investments And Joint Ventures [Abstract]        
Management and other fees $ 6.3 $ 6.5 $ 22.2 $ 19.6
Development fees and leasing commissions 2.2 1.6 5.9 4.8
Interest income $ 8.4 $ 6.5 $ 25.0 $ 19.2