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Earnings Per Share - Computation of Loss Per Share (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2025
USD ($)
$ / shares
shares
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]  
Net loss attributable to Infinity Natural Resources, Inc. | $ $ (34,569)
Weighted average number of Class A common stock outstanding:  
Weighted-average shares of Class A common stock outstanding—basic (in shares) 15,237,500
Weighted-average shares of Class A common stock outstanding—diluted (in shares) 15,237,500
Net loss attributable to Infinity Natural Resources, Inc. per share of Class A common stock—basic (in dollars per share) | $ / shares $ (2.27)
Net loss attributable to Infinity Natural Resources, Inc. per share of Class A common stock—diluted (in dollars per share) | $ / shares $ (2.27)
INR Units  
Weighted average number of Class A common stock outstanding:  
Effect of dilutive securities (in shares) 0
RSUs  
Weighted average number of Class A common stock outstanding:  
Effect of dilutive securities (in shares) 0
PSUs  
Weighted average number of Class A common stock outstanding:  
Effect of dilutive securities (in shares) 0