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Noncontrolling Interests - Holders of Convertible Limited Partnership Units in the Operating Partnership (Details) - shares
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2024
Noncontrolling Interest [Line Items]            
Limited partnership units (in shares) 10,400,000   10,400,000     10,000,000.0
Limited partnership units, conversion ratio 1   1      
Outstanding stock percent that should be acquired for rights to be exercised (as a percent) 39.90%   39.90%      
Limited partnership units convertible into shares of common stock, eligible for conversion (in shares) 1,451,000   1,451,000     600,000
Fully converted partnership units and diluted weighted average shares outstanding       34,900,000 34,500,000  
Noncontrolling interests            
Noncontrolling Interest [Line Items]            
Fully converted partnership units and diluted weighted average shares outstanding 35,100,000 34,600,000        
Leasehold Interest Contributed In Contribution Agreement            
Noncontrolling Interest [Line Items]            
Number of partnership units issued in transaction (in shares)     469,740     469,740
Saul Holdings Limited Partnership            
Noncontrolling Interest [Line Items]            
Percentage of ownership interest of noncontrolling interest (as a percent) 29.80%   29.80%     29.00%
Limited partnership units, conversion ratio 1   1     1
Saul Holdings Limited Partnership | Leasehold Interest Contributed In Contribution Agreement            
Noncontrolling Interest [Line Items]            
Percentage of ownership interest of noncontrolling interest (as a percent) 1.30%   1.30%     1.40%
Operating Partnership Held By Noncontrolling Interest            
Noncontrolling Interest [Line Items]            
Percentage of ownership interest of noncontrolling interest (as a percent) 31.10%   31.10%     30.40%