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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity Method Investments And Joint Ventures [Abstract]        
Management and other fees $ 6.7 $ 9.6 $ 13.6 $ 15.8
Interest income 6.3 8.3 13.8 16.6
Development fees and leasing commissions $ 1.9 $ 1.8 $ 4.4 $ 3.7