Investments in Real Estate Partnerships - Balance Sheet Summarized Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Document Fiscal Year Focus	2017
Investment in real estate, net	$ 2,682,578	$ 2,439,110
Acquired lease intangible assets, net	54,021	42,974
Other assets	149,121	126,658
Total assets	2,885,720	2,608,742
Notes payable	1,514,729	1,309,931
Acquired lease intangible liabilities, net	42,466	29,678
Other liabilities	70,498	64,979
Capital - Regency	445,068	405,722
Capital - Third parties	812,959	798,432
Total liabilities and capital	2,885,720	2,608,742
Investments in real estate partnerships (note 4)	386,304	296,699
Impairment Losses Related to Real Estate Partnerships	(1,300)	(1,300)
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity		(30,902)
Equity Method Summarized Financial Information, Net Book Equity in Excess of Purchase Price	(78,203)	(78,203)
US Regency Retail 1, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Total assets	90,900	109,665
Investments in real estate partnerships (note 4)	0	13,176
Basis Difference [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	40,351	1,382
Restricted Gain Method Deferral [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	(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)	$ 11,290	$ 0