Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flow Supplemental Disclosures [Line Items]
Cash paid for interest	$ 31,498	$ 50,639
Cash paid for taxes	203	199
Non-cash increase in investments in real estate, intangible assets, and other liabilities from conversion of loans	1,590	$ 1,499
Non-cash (decrease) in investments in real estate, restricted cash, other assets, intangible assets, accounts payable and accrued expenses, and other liabilities from deconsolidation of properties	(43,025)
Non-cash increase (decrease) in indebtedness from debt extinguishments	(3,813)
Non-cash increase (decrease) in indebtedness from deconsolidation of properties	(27,467)
South Terrace
Cash Flow Supplemental Disclosures [Line Items]
Non-cash increase (decrease) to noncontrolling interests from distribution of limited partnership units on South Terrace	$ (1,618)