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Summary of Significant Accounting Policies - Additional Information (Detail)
12 Months Ended
Jan. 01, 2019
USD ($)
ShoppingCenter
Office
Jul. 01, 2018
USD ($)
ShoppingCenter
shares
Dec. 31, 2019
USD ($)
Affiliate
Segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 26, 2018
Summary Of Significant Accounting Policies [Line Items]            
Mortgage indebtedness     $ 94,874,000 $ 88,743,000    
Maximum exposure to losses associated with VIEs     114,000,000.0 192,200,000    
Capitalized costs     3,800,000 5,700,000 $ 7,400,000  
Impairment charges related to consolidated real estate investment     3,370,000 69,324,000 340,480,000  
Impairment charge of assets included in spin-off RVI       14,100,000    
Interest paid     79,500,000 148,400,000 194,700,000  
Capitalized interest paid     1,300,000 1,100,000 1,900,000  
Net preferred equity interest     112,589,000 189,891,000    
Reserve of preferred equity interest     15,544,000 11,422,000 61,000,000  
Accounts receivable, not probable of being collected amount     1,000,000.0 3,200,000    
Allowance for straight line rent     2,800,000 2,300,000    
Straight line rent receivable, net     $ 31,200,000 31,100,000    
Contract asset, explanation of change       The portion of payments retained by the customer until the second contingent event is not considered a significant financing component because the right to payment is expected to become unconditional within one year or less.  Contract assets are transferred to receivables when the right to payment becomes unconditional      
Stock-based compensation cost recognized by the company     $ 9,200,000 7,700,000 11,500,000  
Accelerated vesting of awards due to employee separation charges       1,400,000 5,500,000  
Number of reportable segments | Segment     2      
Quantitative threshold of revenues, profit or loss and assets for identifying reportable segments     The Company’s chief operating decision maker may review operational and financial data on a property basis and does not differentiate properties on a geographical basis for purposes of allocating resources or capital.  The Company evaluates individual property performance primarily based on net operating income before depreciation, amortization and certain nonrecurring items.  Each consolidated shopping center is considered a separate operating segment; however, each shopping center, on a stand-alone basis, represents less than 10% of revenues, profit or loss, and assets of the combined reported operating segment and meets the majority of the aggregations criteria under the applicable standard.      
Number of shopping centers leased under ground lease agreements | ShoppingCenter 3          
Number of additional lease agreements where company is lessee | Office 3          
ROU assets $ 22,000,000.0   $ 21,792,000 0    
Lease liabilities 40,300,000   $ 40,725,000      
Reversal of real estate taxes paid by tenants $ 1,700,000          
Maximum [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Operating lease term     30 years      
Maximum [Member] | Geographic Concentration Risk [Member] | Revenues [Member] | Shopping Center [Member] | Stand-Alone Shopping Center [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Percentage of revenues     10.00%      
Maximum [Member] | Tenant [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Operating lease term     30 years      
Minimum [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Operating lease term     1 month      
Minimum [Member] | Tenant [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Operating lease term     1 month      
Real Estate Investment [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Impairment charges related to consolidated real estate investment     $ 3,400,000 $ 69,300,000 340,500,000  
Adoption of Topic 606 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Revenue recognized percentage upon lease execution       50.00%    
Revenue recognized percentage upon tenant rent commencement       50.00%    
Adjustment for Contractual Lease Payments [Member] | ASU 2016-02 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Reclassification adjustments       $ 13,400,000 $ 23,900,000  
Variable Interest Entity, Not Primary Beneficiary [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of unconsolidated joint ventures | Affiliate     2      
Mortgages [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Mortgage indebtedness     $ 94,900,000 $ 88,700,000    
Retail Value Inc. [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Disposition fees equal to percentage of gross sale price     1.00%      
Retail Value Inc. [Member] | Series A Preferred Stock [Member] | Aggregate Gross Proceeds of RVI's Asset Sales Subsequent to July 1, 2018 Exceeds $2.0 Billion [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Preferred stock, value   $ 190,000,000        
Maximum increase in preferred stock amount   $ 10,000,000        
Spin-off [Member] | Maximum [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Dividend payments to be received will be recorded as reduction of preferred shares carrying value     $ 190,000,000      
Spin-off [Member] | Retail Value Inc. [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of shopping centers in connection with spinoff | ShoppingCenter   48        
Gross asset value   $ 2,700,000,000        
Percentage of distribution of outstanding common shares rights to holders           100.00%
Spin off distribution description   On the spin-off date, holders of SITE Centers’ common shares received one common share of RVI for every ten shares of SITE Centers’ common stock held on the record date.        
Spin-off [Member] | Retail Value Inc. [Member] | Series A Preferred Stock [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of shares retained | shares   1,000        
Spin-off [Member] | Retail Value Inc. [Member] | Series A Preferred Stock [Member] | Aggregate Gross Proceeds of RVI's Asset Sales Subsequent to July 1, 2018 Exceeds $2.0 Billion [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Preferred stock, value   $ 190,000,000        
Maximum increase in preferred stock amount   10,000,000        
Spin-off [Member] | Retail Value Inc. [Member] | Mortgages [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Mortgage indebtedness   $ 1,270,000,000        
U.S. [Member] | Spin-off [Member] | Retail Value Inc. [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of shopping centers in connection with spinoff | ShoppingCenter   36        
Puerto Rico [Member] | Spin-off [Member] | Retail Value Inc. [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of shopping centers in connection with spinoff | ShoppingCenter   12