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, 2021	Mar. 31, 2020
Revenue from contracts:
Total revenue from contracts with customers	$ 7,705	$ 14,747
Other:
Interest income	0	3,500
Other	400	700
Other, Total	400	4,200
Revenue and other income	3,400	11,300
Asset and Property Management Fees [Member]
Revenue from contracts:
Total revenue from contracts with customers	6,575	9,325
Unconsolidated Joint Ventures [Member]
Revenue from contracts:
Total revenue from contracts with customers	3,000	7,100
Unconsolidated Joint Ventures [Member] | Asset and Property Management Fees [Member]
Revenue from contracts:
Total revenue from contracts with customers	2,600	4,500
Unconsolidated Joint Ventures [Member] | Development Fees, Leasing Commissions and Other [Member]
Revenue from contracts:
Total revenue from contracts with customers	$ 400	$ 2,600