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Investments in and Advances to Joint Ventures - Revenues Earned By the Company from Unconsolidated Joint Ventures and Interest Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue from contracts:        
Other $ 0.1 $ 0.2 $ 0.4 $ 0.8
Revenue and other income 1.6 2.5 5.2 8.6
Unconsolidated Joint Ventures [Member]        
Revenue from contracts:        
Total revenue from contracts with customers 1.5 2.3 4.8 7.8
Unconsolidated Joint Ventures [Member] | Asset and Property Management Fees [Member]        
Revenue from contracts:        
Total revenue from contracts with customers 1.4 1.7 4.4 6.2
Unconsolidated Joint Ventures [Member] | Leasing commissions and development fees [Member]        
Revenue from contracts:        
Total revenue from contracts with customers $ 0.1 $ 0.6 $ 0.4 $ 1.6