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Earnings Per Share - Computation of Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net loss attributable to Infinity Natural Resources, Inc. $ (1,871) $ (34,569)
Accretion of Series A Preferred Stock cumulative undeclared dividends (3,104) 0
Net loss available to Class A common stockholders - Basic (4,975) (34,569)
Net loss available to Class A common stockholders - Diluted $ (4,975) $ (34,569)
Weighted average number of common units outstanding:    
Weighted average number of common units outstanding—Basic (in shares) 17,662,870 15,237,500
Weighted-average shares of Class A common stock outstanding—Diluted (in shares) 17,662,870 15,237,500
Net loss available to Class A common stockholders per share - Basic (in dollars per share) $ (0.28) $ (2.27)
Net loss available to Class A common stockholders per share - Diluted (in dollars per share) $ (0.28) $ (2.27)
INR Units    
Weighted average number of common units outstanding:    
Effect of dilutive securities (in shares) 0 0
RSUs    
Weighted average number of common units outstanding:    
Effect of dilutive securities (in shares) 0 0
PSUs    
Weighted average number of common units outstanding:    
Effect of dilutive securities (in shares) 0 0