Investments in and Advances to Joint Ventures - Revenues Earned By the Company from Unconsolidated Joint Ventures and Interest Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue from contracts:
Total revenue from contracts with customers	$ 14,747	$ 16,585
Other:
Interest income	3,500	4,200
Other	700	800
Other, Total	4,200	5,000
Revenue and other income	11,300	11,600
Asset and Property Management Fees [Member]
Revenue from contracts:
Total revenue from contracts with customers	9,325	11,531
Unconsolidated Joint Ventures [Member]
Revenue from contracts:
Total revenue from contracts with customers	7,100	6,600
Unconsolidated Joint Ventures [Member] | Asset and Property Management Fees [Member]
Revenue from contracts:
Total revenue from contracts with customers	4,500	5,200
Unconsolidated Joint Ventures [Member] | Development Fees, Leasing Commissions and Other [Member]
Revenue from contracts:
Total revenue from contracts with customers	$ 2,600	$ 1,400