Investments in Unconsolidated Joint Ventures (Combined Financial Information Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Properties	$ 3,756,890	$ 3,371,216
Accumulated depreciation and amortization	(767,678)	(661,611)
Properties, net	2,989,212	2,709,605
Cash and cash equivalents	147,102	83,882
Allowance For Doubtful Accounts, Unconsolidated Joint Ventures	4,706	1,965
Accounts and notes receivable, less allowance for doubtful accounts of $4,706 and $1,965 in 2017 and 2016	121,173	87,612
Deferred charges and other assets	136,837	67,167
Total Assets	3,394,324	2,948,266
Liabilities and accumulated deficiency in assets:
Notes payable, net (1)	2,860,384	2,706,628
Accounts payable and other liabilities	471,948	359,814
TRG's accumulated deficiency in assets	(48,338)	(166,226)
Unconsolidated Joint Venture Partners' accumulated deficiency in assets	110,330	48,050
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	3,394,324	2,948,266
TRG's investment in and advances to CityOn.Zhengzhou	46,106	112,861
TRG basis adjustments, including elimination of intercompany profit	63,886	126,240
TCO's additional basis	49,124	51,070
Net Investment in Unconsolidated Joint Ventures	110,778	123,945
Distributions in excess of investments in and net income of Unconsolidated Joint Ventures	494,851	480,863
Investment in Unconsolidated Joint Ventures	$ 605,629	604,808
CityOn.Zhengzhou [Member]
Schedule of Equity Method Investments [Line Items]
Construction Loan		70,500
Construction Loan, At Beneficial Interest		$ 34,500