Investments in and Advances to Joint Ventures - Revenues Earned By the Company from Unconsolidated Joint Ventures (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue from contracts:
Total revenue from contracts with customers	$ 14,398	$ 6,501	$ 30,983	$ 14,044
Other:
Interest income	4,200	4,800	8,400	9,800
Other	800	700	1,500	1,200
Total fee and other income	10,900	12,000	22,500	25,000
Asset and Property Management Fees [Member]
Revenue from contracts:
Total revenue from contracts with customers	11,110	4,886	22,641	10,482
Unconsolidated Joint Ventures [Member]
Revenue from contracts:
Total revenue from contracts with customers	5,900	6,500	12,600	14,000
Unconsolidated Joint Ventures [Member] | Asset and Property Management Fees [Member]
Revenue from contracts:
Total revenue from contracts with customers	4,800	4,900	10,100	10,500
Unconsolidated Joint Ventures [Member] | Development Fees, Leasing Commissions and Other [Member]
Revenue from contracts:
Total revenue from contracts with customers	$ 1,100	$ 1,600	$ 2,500	$ 3,500