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Disposals of Operating Properties and Impairment Charges - Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($) property	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($) property	Feb. 27, 2019 USD ($)	Jun. 29, 2018 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate		$ 529,417	$ 218,387	$ 76,075
Depreciation and amortization		$ 37,723	$ 70,360	7,411
Property, plant, and equipment, fair value disclosure				26,000
Seven unnamed impaired properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property		7
Depreciation and amortization		$ 37,700
Property, plant, and equipment, fair value disclosure		176,000
Four unnamed impaired properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	7		7
Depreciation and amortization	$ 70,400		$ 70,400
Property, plant, and equipment, fair value disclosure	$ 130,200		130,200
Scenario, Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate held-for-sale					$ 500,000
2019 Operating Properties Sold
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate		543,800
Gain on disposal		$ 39,000
Trussville Promenade, Memorial Commons, Lake Lofts at Deerwood, Hamilton Crossing, Fox Lake Crossing and Lowe's Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate			122,200
Livingston Shopping Center, Plaza Volente, and Tamiami Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal			$ 3,400
Cove Center, 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 sale of real estate				76,100
Gain on disposal				$ 15,200
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]
Number of real estate properties \| property	3		3			3
Consideration received	$ 99,800		$ 99,800			$ 99,800
TH Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interest, ownership percentage by parent	80.00%		80.00%
Disposed of by sale \| 2019 Operating Properties Sold
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property		23
Disposed of by sale \| Trussville Promenade, Memorial Commons, Lake Lofts at Deerwood, Hamilton Crossing, Fox Lake Crossing and Lowe's Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	6		6
Disposed of by sale \| Cove Center, 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]
Number of real estate properties \| property				4