Cover page - shares	6 Months Ended
	Jun. 30, 2022	Jul. 25, 2022
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	001-37386
Entity Registrant Name	FORTRESS TRANSPORTATION AND INFRASTRUCTURE INVESTORS LLC
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		99,378,771
Entity Central Index Key	0001590364
Document Fiscal Year Focus	2022
Amendment Flag	false
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
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	NASDAQ
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	FTAIP
Security Exchange Name	NASDAQ
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	FTAIO
Security Exchange Name	NASDAQ
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	FTAIN
Security Exchange Name	NASDAQ