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Indebtedness - Schedule of Fair Market Value and Carrying Value of Indebtedness (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Indebtedness Associated with Assets Held for Sale    
Debt Instrument [Line Items]    
Fair Value $ 767.8 $ 751.8
Carrying Value 765.0 748.3
Mortgages and other notes payable, net    
Debt Instrument [Line Items]    
Fair Value 528.5 528.7
Carrying Value 528.0 530.6
Credit facilities    
Debt Instrument [Line Items]    
Fair Value 413.5 426.6
Carrying Value $ 412.5 $ 425.6