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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Mar. 05, 2025
Jun. 28, 2024
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2024    
Entity File Number 001-42113    
Entity Registrant Name Seaport Entertainment Group Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 99-0947924    
Entity Address State Or Province NY    
Entity Address, Address Line One 199 Water Street, 28th Floor    
Entity Address, City or Town New York    
Entity Address, Postal Zip Code 10038    
City Area Code 212    
Local Phone Number 732-8257    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol SEG    
Security Exchange Name NYSEAMER    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period true    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 0
Entity Common Stock, Shares Outstanding   12,696,599  
Documents Incorporated by Reference

Portions of the registrant’s Proxy Statement for its 2025 Annual Meeting of Stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K. The registrant intends to file its Proxy Statement with the Securities and Exchange Commission no later than 120 days after the end of its fiscal year ended December 31, 2024.

    
Entity Central Index Key 0002009684    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name KPMG LLP    
Auditor Location Dallas, Texas    
Auditor Firm ID 185