v3.26.1
Segment Reporting - Schedule of Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Revenue $ 838,692 $ 731,593 $ 639,111
Operating expenses:      
Total operating (loss) income (135,293) 129,544 116,859
Interest income 4,166 4,524 2,660
Interest expense (1,436) (64) (138)
Other income, net 5,391 3,192 1,559
(Loss) income before income tax expense (127,172) 137,196 120,940
Income tax expense 2,997 2,395 2,257
Net loss attributable to Andersen Group Inc. [1] (2,324)    
Reportable Segment      
Segment Reporting Information [Line Items]      
Revenue 838,692 731,593 639,111
Operating expenses:      
Personnel costs 818,290 462,394 403,294
Non-personnel costs 146,690 131,330 111,267
Depreciation and amortization 9,005 8,325 7,691
Total operating expenses 973,985 602,049 522,252
Total operating (loss) income (135,293) 129,544 116,859
Interest income 4,166 4,524 2,660
Interest expense (1,436) (64) (138)
Other income, net 5,391 3,192 1,559
(Loss) income before income tax expense (127,172) 137,196 120,940
Income tax expense 2,997 2,395 2,257
Net loss attributable to Andersen Group Inc. $ (130,169) $ 134,801 $ 118,683
[1]
Represents net loss attributable to Andersen Group Inc. for the period following the IPO and Reorganization Transactions as described in Note 1 in the accompanying notes.