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Cover page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2021
Feb. 22, 2022
Jun. 30, 2021
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 001-37386    
Entity Registrant Name Fortress Transportation & Infrastructure Investors LLC    
Entity Central Index Key 0001590364    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 32-0434238    
Entity Address, Address Line One 1345 Avenue of the Americas, 45th Floor    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10105    
City Area Code 212    
Local Phone Number 798-6100    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 2.8
Entity Common Stock, Shares Outstanding   99,188,696  
Documents Incorporated by Reference Portions of the registrant's definitive proxy statement for the registrant's 2022 annual meeting, to be filed within 120 days after the close of the registrant's fiscal year, are incorporated by reference into Part III of this Annual Report on Form 10-K.    
Class A common shares, $0.01 par value per share      
Entity Information [Line Items]      
Title of 12(b) Security Class A common shares, $0.01 par value per share    
Trading Symbol FTAI    
Security Exchange Name NYSE    
8.25% Fixed-to-Floating Rate Series A Cumulative Perpetual Redeemable Preferred Shares      
Entity Information [Line Items]      
Title of 12(b) Security 8.25% Fixed-to-Floating Rate Series A Cumulative Perpetual Redeemable Preferred Shares    
Trading Symbol FTAI PR A    
Security Exchange Name NYSE    
8.00% Fixed-to-Floating Rate Series B Cumulative Perpetual Redeemable Preferred Shares      
Entity Information [Line Items]      
Title of 12(b) Security 8.00% Fixed-to-Floating Rate Series B Cumulative Perpetual Redeemable Preferred Shares    
Trading Symbol FTAI PR B    
Security Exchange Name NYSE    
8.25% Fixed-Rate Reset Series C Cumulative Perpetual Redeemable Preferred Shares      
Entity Information [Line Items]      
Title of 12(b) Security 8.25% Fixed-Rate Reset Series C Cumulative Perpetual Redeemable Preferred Shares    
Trading Symbol FTAI PR C    
Security Exchange Name NYSE