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Cover - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Mar. 01, 2024
Jun. 30, 2023
Entity Listings [Line Items]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 001-35493    
Entity Registrant Name STEEL PARTNERS HOLDINGS L.P.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 13-3727655    
Entity Address, Address Line One 590 Madison Avenue, 32nd Floor    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10022    
City Area Code 212    
Local Phone Number 520-2300    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 248.1
Entity Common Stock, Shares Outstanding (in shares)   20,719,101  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Company's definitive proxy statement for the 2024 Annual Meeting of Limited Partners are incorporated by reference into Part III of this annual report on Form 10-K.
   
Entity Central Index Key 0001452857    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Stock      
Entity Listings [Line Items]      
Title of 12(b) Security Common units, no par value    
Trading Symbol SPLP    
Security Exchange Name NYSE    
Series A Preferred Units      
Entity Listings [Line Items]      
Title of 12(b) Security 6.0% Series A Preferred Units    
Trading Symbol SPLP-PRA    
Security Exchange Name NYSE