Investments in and Advances to Joint Ventures - Condensed Combined Financial Information of Company's Unconsolidated Joint Venture Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Condensed Combined Balance Sheets
Land	$ 881,581		$ 881,397
Buildings	3,302,821		3,277,440
Fixtures and tenant improvements	498,999		491,312
Total real estate rental property	4,683,401		4,650,149
Less: Accumulated depreciation	(1,358,535)		(1,289,148)
Real estate rental property, net	3,324,866		3,361,001
Construction in progress and land	56,203		59,663
Total real estate assets, net	3,381,069		3,420,664
Other assets, net	94,008		108,631
Total assets	4,048,531		4,093,622
Mortgage debt	53,765		94,874
Total liabilities	2,088,727		2,112,144
Accumulated equity	1,959,804	$ 1,967,478	1,981,478	$ 2,027,251	$ 2,052,966	$ 2,073,002
Total liabilities and equity	4,048,531		4,093,622
Company's share of accumulated equity	72,499		186,247
Redeemable preferred equity, net	89,049		112,589
Basis differentials	8,232		(6,864)
Deferred development fees, net of portion related to the Company's interest	(1,453)		(2,452)
Amounts payable to the Company	4,979		4,975
Investments in and Advances to Joint Ventures, net	173,306		294,495
Unconsolidated Joint Ventures [Member]
Condensed Combined Balance Sheets
Land	555,891		895,427
Buildings	1,686,833		2,583,053
Fixtures and tenant improvements	158,526		233,303
Total real estate rental property	2,401,250		3,711,783
Less: Accumulated depreciation	(565,623)		(949,879)
Real estate rental property, net	1,835,627		2,761,904
Construction in progress and land	53,344		58,855
Total real estate assets, net	1,888,971		2,820,759
Cash and restricted cash	62,395		109,260
Receivables, net	31,390		37,191
Other assets, net	98,627		147,129
Total assets	2,081,383		3,114,339
Mortgage debt	1,435,666		1,640,146
Notes and accrued interest payable to the Company	4,979		4,975
Other liabilities	99,936		142,754
Total liabilities	1,540,581		1,787,875
Redeemable preferred equity – SITE Centers	219,403		217,871
Accumulated equity	321,399		1,108,593
Total liabilities and equity	$ 2,081,383		$ 3,114,339