REVENUES - Components of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Total revenues	$ 122,286	$ 84,887	$ 218,447	$ 167,422
Employer contributions			1,000	1,200
Capitalized Contract Cost, Net	21,000		21,000		$ 23,500
Capitalized Contract Cost, Net, Current	4,900		4,900		4,900
Capitalized Contract Cost, Net, Noncurrent	16,100		16,100		$ 18,600
Deferred Revenue, Revenue Recognized	700		1,100
Capitalized Contract Cost, Amortization	1,200	1,400	2,500	2,000
Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenues	13,730	14,213	26,706	27,741
Lease income
Disaggregation of Revenue [Line Items]
Total revenues	1,246	1,184	2,583	2,392
Lease income \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Rail revenues
Disaggregation of Revenue [Line Items]
Total revenues	42,292	45,256	84,466	91,157
Rail revenues \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenues	513	0	513	0
Terminal services revenues
Disaggregation of Revenue [Line Items]
Total revenues	24,284	24,234	46,989	46,132
Terminal services revenues \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Roadside services revenues
Disaggregation of Revenue [Line Items]
Total revenues	13,217		26,193
Roadside services revenues \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenues	13,217		26,193
Other revenue
Disaggregation of Revenue [Line Items]
Total revenues	279		280
Other revenue \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Roadside services revenues
Disaggregation of Revenue [Line Items]
Total revenues		14,213		27,741
Roadside services revenues \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenues		14,213		27,741
Power Revenues
Disaggregation of Revenue [Line Items]
Total revenues	38,010		53,790
Power Revenues \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Gas Revenues
Disaggregation of Revenue [Line Items]
Total revenues	2,958		4,146
Gas Revenues \| Corporate and Other
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Railroad \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	42,140	45,638	84,771	91,950
Railroad \| Lease income \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	361	382	818	793
Railroad \| Rail revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	41,779	45,256	83,953	91,157
Railroad \| Terminal services revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Railroad \| Roadside services revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Railroad \| Other revenue \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Railroad \| Roadside services revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues		0		0
Railroad \| Power Revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Railroad \| Gas Revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Jefferson Terminal \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	21,628	21,174	41,077	39,790
Jefferson Terminal \| Lease income \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	885	802	1,765	1,599
Jefferson Terminal \| Rail revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Jefferson Terminal \| Terminal services revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	20,743	20,372	39,312	38,191
Jefferson Terminal \| Roadside services revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Jefferson Terminal \| Other revenue \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Jefferson Terminal \| Roadside services revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues		0		0
Jefferson Terminal \| Power Revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Jefferson Terminal \| Gas Revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Repauno \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	2,992	3,862	6,803	7,941
Repauno \| Lease income \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Repauno \| Rail revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Repauno \| Terminal services revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	2,713	3,862	6,523	7,941
Repauno \| Roadside services revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Repauno \| Other revenue \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	279		280
Repauno \| Roadside services revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues		0		0
Repauno \| Power Revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Repauno \| Gas Revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Power and Gas \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	41,796	0	59,090	0
Power and Gas \| Lease income \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Power and Gas \| Rail revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Power and Gas \| Terminal services revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	828		1,154
Power and Gas \| Roadside services revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Power and Gas \| Other revenue \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	0		0
Power and Gas \| Power Revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	38,010		53,790
Power and Gas \| Gas Revenues \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	2,958		4,146
Sustainability \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0	$ 0	$ 0

FTAI Infrastructure Inc. 10-Q