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Investments in and Advances to Joint Ventures - Service Fees and Income Earned by Company's Unconsolidated Joint Ventures and Interest Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue from contracts with customers:        
Total revenue from contracts with customers $ 6,501 $ 7,928 $ 14,044 $ 16,552
Other:        
Interest income 4,800 6,300 9,800 13,800
Other 700 700 1,200 1,400
Total fee and other income 12,000 14,900 25,000 31,800
Asset and Property Management Fees [Member]        
Revenue from contracts with customers:        
Total revenue from contracts with customers 4,886 6,017 10,482 12,190
Development Fees and Leasing Commissions [Member]        
Revenue from contracts with customers:        
Total revenue from contracts with customers $ 1,600 $ 1,900 $ 3,500 $ 4,400