v3.26.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 08, 2026
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Entity Registrant Name Cardinal Infrastructure Group Inc  
Entity Central Index Key 0002079999  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Shell Company false  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity File Number 001-43004  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 39-3180206  
Entity Address, Address Line One 100 E. Six Forks Road  
Entity Address, Address Line Two #300  
Entity Address, City or Town Raleigh  
Entity Address, State or Province NC  
Entity Address, Postal Zip Code 27609  
City Area Code 919  
Local Phone Number 324-1964  
Document Quarterly Report true  
Document Transition Report false  
Title of 12(b) Security Class A Common Stock, $0.0001 Par Value  
Security Exchange Name NASDAQ  
Trading Symbol CDNL  
Class A Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   15,292,984
Class B Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   27,573,875