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Investments in and Advances to Joint Ventures - Revenues Earned by Company's Unconsolidated Joint Ventures and Interest Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from contracts:      
Total revenue from contracts with customers $ 55,988 $ 42,788 $ 30,553
Other:      
Interest income 16,700 19,000 25,900
Other 3,200 2,600 2,800
Other, Total 19,900 21,600 28,700
Revenue and other income 44,800 47,300 59,200
Asset and Property Management Fees [Member]      
Revenue from contracts:      
Total revenue from contracts with customers 42,355 31,751 21,494
Unconsolidated Joint Ventures [Member]      
Revenue from contracts:      
Total revenue from contracts with customers 24,900 25,700 30,500
Unconsolidated Joint Ventures [Member] | Asset and Property Management Fees [Member]      
Revenue from contracts:      
Total revenue from contracts with customers 19,700 18,800 21,400
Unconsolidated Joint Ventures [Member] | Development Fees, Leasing Commissions and Other [Member]      
Revenue from contracts:      
Total revenue from contracts with customers $ 5,200 $ 6,900 $ 9,100