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Noncontrolling Interests - Additional Information (Details)
$ / shares in Thousands, $ in Millions
 9 Months Ended 12 Months Ended
Oct. 13, 2025
shares
Sep. 30, 2025
USD ($)
class
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2024
USD ($)
Noncontrolling Interest [Line Items]        
Holding period for right to exchange (in months)   12 months    
Right to exchange, conversion ratio   1    
Redeemable noncontrolling interest, common stock class C units | $   $ 25.0   $ 25.0
HRH Class B Unit Noncontrolling Interests        
Noncontrolling Interest [Line Items]        
Preferred stock, par or stated value per share (in dollars per share) | $ / shares   $ 1    
Percentage of preferred return   10.00%    
Preferred stock, redemption price (in dollars per unit) | $ / shares   $ 1    
San Francisco Venture        
Noncontrolling Interest [Line Items]        
Issuance of Class C common shares (in shares) | shares     25,000,000.0  
Proceeds from issuance of redeemable noncontrolling interest | $     $ 25.0  
Authorized redemption percent     50.00%  
Maximum amount payable, class C units | $     $ 25.0  
Infrastructure development costs | $     25.0  
San Francisco Venture | Maximum        
Noncontrolling Interest [Line Items]        
Authorized contribution amount | $     $ 25.0  
The San Francisco Venture        
Noncontrolling Interest [Line Items]        
Holding period for right to exchange (in months)   12 months    
Right to exchange, conversion ratio   1    
Number of classes of membership units | class   3    
Unitholder request for redemption, minimum ownership   50.10%    
Conversion of Class B Common Shares Into Class A Common Shares        
Noncontrolling Interest [Line Items]        
Conversion of common shares, ratio   0.0003    
Five Point Operating Company, LLC        
Noncontrolling Interest [Line Items]        
Noncontrolling interest percentage of outstanding common units   37.20%    
Five Point Operating Company, LLC | Management Partner | Subsequent Event        
Noncontrolling Interest [Line Items]        
Shares converted (in shares) | shares 3,137,134      
Conversion of stock, shares returned (in shares) | shares 2,027,962      
Five Point Operating Company, LLC | Management Partner | Common Class A | Subsequent Event        
Noncontrolling Interest [Line Items]        
Conversion of stock, shares issued (in shares) | shares 1,109,172      
Five Point Operating Company, LLC | Class A Units | Related Party        
Noncontrolling Interest [Line Items]        
Ownership percentage of outstanding common units   62.80%    
Five Point Operating Company, LLC | Class B Units | Related Party        
Noncontrolling Interest [Line Items]        
Ownership percentage of outstanding common units   100.00%    
Hearthstone | Hearthstone Inc. And Affiliated Trusts | HRH Class B Unit Noncontrolling Interests        
Noncontrolling Interest [Line Items]        
Noncontrolling interest percentage of outstanding common units   100.00%    
Preferred stock, shares outstanding (in shares) | shares   10,472    
Hearthstone | Hearthstone Inc. And Affiliated Trusts | HRH Class A Unit Noncontrolling Interests        
Noncontrolling Interest [Line Items]        
Noncontrolling interest percentage of outstanding common units   25.00%    
Hearthstone | Hearthstone Venture Class A Units        
Noncontrolling Interest [Line Items]        
Ownership percentage of outstanding common units   75.00%