v3.26.1
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 20, 2026
Jun. 30, 2025
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Securities Act File Number 001-41090    
Entity Registrant Name Southland Holdings, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 87-1783910    
Entity Address, Address Line One 1100 Kubota Dr.    
Entity Address, City or Town Grapevine    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 76051    
City Area Code 817    
Local Phone Number 293 - 4263    
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 true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   54,113,036  
Entity Public Float     $ 60,060,635
Entity Central Index Key 0001883814    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name GRANT THORNTON LLP    
Auditor Location Dallas, Texas    
Auditor Firm ID 248    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction false    
Documents Incorporated by Reference [Text Block]

Items 10, 11, 12, 13, and 14 of Part III incorporate information by reference from the registrant’s definitive proxy statement relating to its 2026 annual meeting of stockholders (the “2026 Proxy Statement”) to be filed with the Securities and Exchange Commission no later than 120 days after the close of the registrant’s fiscal year to which this report relates.

    
Common stock      
Document and Entity Information      
Title of 12(b) Security Common stock, par value $0.0001 per share    
Trading Symbol SLND    
Security Exchange Name NYSEAMER    
Redeemable warrants      
Document and Entity Information      
Title of 12(b) Security Redeemable warrants, exercisable for shares of common stock at an exercise price of $11.50 per share    
Trading Symbol SLND WS    
Security Exchange Name NYSEAMER