v3.26.1
Segment Reporting - Schedule of Reportable Operating Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Revenue $ 217,658 $ 175,991 $ 458,404 $ 384,058
Operating expenses:        
Operating (loss) income (8,922) (105,167) 15,158 (52,520)
Interest income 1,497 1,030 3,376 2,230
Interest expense (5,887) (104) (12,121) (247)
Other income, net 3,145 1,291 3,971 2,293
(Loss) income before income tax (benefit) expense (10,167) (102,950) 10,384 (48,244)
Income tax (benefit) expense (73) (6,967) 2,740 (2,837)
Net loss attributable to Andersen Group Inc. (1,008)   (514)  
Reportable Segment        
Segment Reporting [Line Items]        
Revenue 217,658 175,991 458,404 384,058
Operating expenses:        
Personnel costs 181,419 248,199 357,104 364,110
Non-personnel and other operating costs 42,639 30,923 81,346 68,337
Depreciation and amortization 2,522 2,036 4,796 4,131
Total operating expenses 226,580 281,158 443,246 436,578
Operating (loss) income (8,922) (105,167) 15,158 (52,520)
Interest income 1,497 1,030 3,376 2,230
Interest expense (5,887) (104) (12,121) (247)
Other income, net 3,145 1,291 3,971 2,293
(Loss) income before income tax (benefit) expense (10,167) (102,950) 10,384 (48,244)
Income tax (benefit) expense (73) (6,967) 2,740 (2,837)
Net loss attributable to Andersen Group Inc. $ (10,094) $ (95,983) $ 7,644 $ (45,407)