Investments in Real Estate Partnerships - Balance Sheet Summarized Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Document Fiscal Year Focus	2018
Investment in real estate, net	$ 3,001,481	$ 2,682,578
Acquired lease intangible assets, net	57,053	54,021
Other assets	169,297	149,121
Total assets	3,227,831	2,885,720
Notes payable	1,609,647	1,514,729
Acquired lease intangible liabilities, net	49,501	42,466
Other liabilities	90,577	70,498
Capital - Regency	498,852	445,068
Capital - Third parties	979,254	812,959
Total liabilities and capital	3,227,831	2,885,720
Investments in real estate partnerships (note 4)	463,001	386,304
Impairment Losses Related to Real Estate Partnerships	(1,300)	(1,300)
US Regency Retail 1, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Total assets	89,524	90,900
Investments in real estate partnerships (note 4)	0	0
Basis Difference [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	(38,064)	(37,852)
Restricted Gain Method Deferral [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	0	(30,902)
Other Liabilities [Member] | US Regency Retail 1, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate partnerships (note 4)	$ 3,513	$ 11,290