Summary of Significant Accounting Policies - Summary of Impact of Revision to Specific Line Items in Consolidated Statements of Loss and Consolidated Statements of Comprehensive Loss (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Net loss attributable to non-controlling interest	[1]	$ (370)
Net loss attributable to ADTRAN Holdings, Inc.		$ (40,083)	$ (1,127)
Loss per common share attributable to ADTRAN Holdings, Inc. - basic		$ (0.51)	$ (0.02)
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted		$ (0.51)	$ (0.02)
Comprehensive Loss attributable to non-controlling interest		$ 12
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax		(31,683)	$ (2,769)
As Reported [Member]
Net loss attributable to non-controlling interest		(5,989)
Net loss attributable to ADTRAN Holdings, Inc.		$ (34,464)
Loss per common share attributable to ADTRAN Holdings, Inc. - basic		$ (0.44)
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted		$ (0.44)
Comprehensive Loss attributable to non-controlling interest		$ 244
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax		(31,915)
Adjustment [Member]
Net loss attributable to non-controlling interest		5,619
Net loss attributable to ADTRAN Holdings, Inc.		$ (5,619)
Loss per common share attributable to ADTRAN Holdings, Inc. - basic		$ (0.07)
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted		$ (0.07)
Comprehensive Loss attributable to non-controlling interest		$ (232)
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax		$ 232

[1] For the three months ended March 31, 2023, we have recognized $3.2 million of net loss attributable to non-controlling interests pre-DPLTA, partially offset by $2.8 million, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA .