| Document and Entity Information | Dec. 30, 2019 |
| Entity Listings [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 30, 2019 |
| Entity Registrant Name | Fortress Transportation & Infrastructure Investors LLC |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-37386 |
| Entity Tax Identification Number | 32-0434238 |
| Entity Address, Address Line One | 1345 Avenue of the Americas |
| Entity Address, Address Line Two | 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001590364 |
| Common Class A [Member] | |
| Entity Listings [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 [Member] | |
| Entity Listings [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 [Member] | |
| Entity Listings [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 |
