v3.25.1
Cover - shares
 3 Months Ended
Mar. 31, 2025
May 20, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Mar. 31, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q1  
Entity Information [Line Items]    
Entity Registrant Name INTEGRATED RAIL AND RESOURCES ACQUISITION CORP.  
Entity Central Index Key 0001854795  
Entity File Number 001-41048  
Entity Tax Identification Number 86-2581754  
Entity Incorporation, State or Country Code DE  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company true  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Incorporation, Date of Incorporation Mar. 12, 2021  
Entity Contact Personnel [Line Items]    
Entity Address, Address Line One 400 W. Morse Boulevard  
Entity Address, Address Line Two Suite 220  
Entity Address, City or Town Winter Park  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 32789  
Entity Phone Fax Numbers [Line Items]    
City Area Code (321)  
Local Phone Number 972-1583  
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   5,976,380
Units, each consisting of one share of Class A common stock, par value $0.0001 per share, and one-half of one redeemable warrant    
Entity Listings [Line Items]    
Title of 12(b) Security Units, each consisting of one share of Class A common stock, par value $0.0001 per share, and one-half of one redeemable warrant  
Trading Symbol IRRXU  
Security Exchange Name NONE  
Class A common stock, par value $0.0001 per share    
Entity Listings [Line Items]    
Title of 12(b) Security Class A common stock, par value $0.0001 per share  
Trading Symbol IRRX  
Security Exchange Name NONE  
Redeemable warrants    
Entity Listings [Line Items]    
Title of 12(b) Security Redeemable warrants  
Trading Symbol IRRXW  
Security Exchange Name NONE