Income Taxes - Reconciliation of GAAP Net Income (Loss) Attributable to Taxable Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
GAAP net income attributable to SITE Centers	$ 35,721	$ 100,699	$ 114,434
Plus: Book depreciation and amortization	154,051	152,707	237,383
Less: Tax depreciation and amortization	(105,385)	(107,830)	(179,197)
Book/tax differences on losses from capital transactions	(45,808)	(52,733)	(161,452)
Joint venture equity loss (earnings), net	10,572	(9,189)	40,682
Deferred income	(13,197)	(417)	(8,436)
Compensation expense	4,031	6,608	3,259
Impairment charges	24,593	18,914	80,746
Puerto Rico tax prepayment	0	0	3,991
RVI transaction costs	0	0	36,177
Miscellaneous book/tax differences, net	549	1,020	17,242
Taxable income before adjustments	65,127	109,779	184,829
Less: Capital gains	0	0	0
Taxable income subject to the 90% dividend requirement	$ 65,127	$ 109,779	$ 184,829