Investments in and Advances to Joint Ventures - Revenues Earned By the Company from Unconsolidated Joint Ventures (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from contracts:
Total revenue from contracts with customers	$ 16,585	$ 7,543
Other:
Interest income	4,200	5,000
Other	800	500
Total fee and other income	11,600	13,000
Asset and Property Management Fees [Member]
Revenue from contracts:
Total revenue from contracts with customers	11,531	5,596
Unconsolidated Joint Ventures [Member]
Revenue from contracts:
Total revenue from contracts with customers	6,600	7,500
Unconsolidated Joint Ventures [Member] | Asset and Property Management Fees [Member]
Revenue from contracts:
Total revenue from contracts with customers	5,200	5,600
Unconsolidated Joint Ventures [Member] | Development Fees, Leasing Commissions and Other [Member]
Revenue from contracts:
Total revenue from contracts with customers	$ 1,400	$ 1,900