v3.26.1
Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator:        
Net (loss) income $ (10,094) $ (95,983) $ 7,644 $ (45,407)
Net (loss) income attributable to noncontrolling interest (9,086)   8,158  
Net loss attributable to Andersen Group Inc. stockholders, basic (1,008)   (514)  
Net loss attributable to Andersen Group Inc. stockholders, diluted $ (1,249)   $ (514)  
Denominator:        
Weighted average number of shares of Class A common stock outstanding, basic (in shares) 13,261,049   12,957,213  
Effect of dilutive RSUs (in shares) 0   0  
Effect of dilutive LTIP Units (in shares) 0   0  
Weighted average number of shares of Class A common stock outstanding, diluted (in shares) 13,261,049   12,957,213  
Earnings per share:        
Earnings per share attributable to Class A common stockholders, basic (in dollars per share) $ (0.08)   $ (0.04)  
Earnings per share attributable to Class A common stockholders, diluted (in dollars per share) $ (0.09)   $ (0.04)