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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue from contracts:      
Total revenue from contracts with customers $ 42,788 $ 30,553 $ 33,234
Other:      
Interest income 19,000 25,900 33,400
Other 2,600 2,800 2,900
Total fee and other income 47,300 59,200 69,500
Asset and Property Management Fees [Member]      
Revenue from contracts:      
Total revenue from contracts with customers 31,751 21,494 25,772
Unconsolidated Joint Ventures [Member]      
Revenue from contracts:      
Total revenue from contracts with customers 25,700 30,500 33,200
Unconsolidated Joint Ventures [Member] | Asset and Property Management Fees [Member]      
Revenue from contracts:      
Total revenue from contracts with customers 18,800 21,400 25,700
Unconsolidated Joint Ventures [Member] | Development Fees and Leasing Commissions [Member]      
Revenue from contracts:      
Total revenue from contracts with customers $ 6,900 $ 9,100 $ 7,500