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Disposals of Operating Properties and Recording of Impairment Charges - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 29, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of operating properties					$ 161,499	$ 76,076
Impairment charges	$ 14,777		$ 0		38,847	$ 7,411
Unnamed Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges	14,800				14,800
Real estate property, fair value disclosure	$ 30,400				30,400
Trussville Promenade and Memorial Commons
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of operating properties		$ 63,000
Disposal group, not discontinued operation, gain (loss) on disposal		500
Cove Center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of operating properties				$ 23,100
Disposal group, not discontinued operation, gain (loss) on disposal				8,900
Unnamed Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges		24,100		7,400
Real estate property, fair value disclosure		$ 24,300		$ 26,000
Livingston Shopping Center, Plaza Volente, and Tamiami Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of operating properties					89,000
Disposal group, not discontinued operation, gain (loss) on disposal					$ 7,800
Clay Marketplace, Shops at Village Walk and Wheatland Towne Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of operating properties			54,600
Disposal group, not discontinued operation, gain (loss) on disposal			$ 6,300
TH Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage (as percent)							20.00%
Noncontrolling interest, ownership percentage by parent (as percent)							80.00%
TH Joint Venture \| Livingston Shopping Center, Plaza Volente, and Tamiami Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration for property contributed							$ 99,800
Equity method investment, ownership percentage (as percent)							20.00%
Equity method investment, fair value							$ 10,000