XML 85 R80.htm IDEA: XBRL DOCUMENT v3.24.1.1.u2
Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Loss Before Income Taxes $ (340,317) $ (51,766)
Tax benefit 18,647 11,313
Net Loss attributable to ADTRAN Holdings, Inc. (324,550) (40,083)
Reclassification Out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Defined benefit plan adjustments - actuarial gain (loss) 87 (51)
Loss Before Income Taxes (74) (33)
Tax benefit 15 12
Net Loss attributable to ADTRAN Holdings, Inc. (59) (21)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Unrealized (Losses) Gains on Available-for-Sale Securities [Member]    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net realized gain (loss) on sales of securities $ (161) $ 18