Consolidated Statements of Changes in Equity - USD ($) shares in Thousands, $ in Thousands	Total	Adtran Networks SE [Member]	Common Stock [Member]	Common Stock [Member] Adtran Networks SE [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Adtran Networks SE [Member]	Retained Earnings (Deficit) [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Non-controlling Interest [Member]	Non-controlling Interest [Member] Adtran Networks SE [Member]
Beginning Balance at Dec. 31, 2021	$ 357,102		$ 797		$ 288,946		$ 740,820	$ (661,547)	$ (11,914)
Beginning Balance, Shares at Dec. 31, 2021			79,652
Net loss	(8,888)						(2,037)			$ (6,851)
Acquisition of Adtran Networks		$ 894,675		$ 280		$ 577,980					$ 316,415
Acquisition of Adtran Networks, Shares				27,995
Retirement of treasury stock			$ (303)				(655,761)	656,064
Retirement of treasury stock, Shares			(30,330)
Other comprehensive income (loss), net of tax	57,709								38,040	19,669
Dividend payments ($0.09 per share)	(22,885)						(22,885)
Dividends accrued on unvested restricted stock units	353						353
Deferred compensation adjustments, net of tax	(71)							(71)
ADTRAN Stock options exercised	6,131	726	$ 3			472	5,330	798			254
ADTRAN Stock options exercised, Shares			399
ADTRAN RSUs and restricted stock vested	(9,847)		$ 4				(10,482)	631
ADTRAN RSUs and restricted stock vested, Shares			372
Reclassification of Adtran Networks stock options	286				187					99
ADTRAN Stock-based compensation expense	26,141	2,181			26,141	2,108					73
Ending Balance at Dec. 31, 2022	1,303,613		$ 781		895,834		55,338	(4,125)	26,126	329,659
Ending Balance, Shares at Dec. 31, 2022			78,088
Net loss	(261,906)						(258,727)			(3,179)
Reclassification and remeasurement from equity to mezzanine equity for non-controlling interests in Adtran Networks	(443,757)					(116,895)					$ (326,862)
Mezzanine equity for non-controlling interest in adtran networks for adtran networks stock options exercised	(1,175)				(1,175)
Acquisition of Adtran Networks	3,762						3,762
Other comprehensive income (loss), net of tax	21,786								21,404	$ 382
Dividend payments ($0.09 per share)	(21,237)						(21,237)
Dividends accrued on unvested restricted stock units	8						8
Deferred compensation adjustments, net of tax	(1,845)						(145)	(1,700)
ADTRAN Stock options exercised		323				323
ADTRAN Stock options exercised	164					323	164
ADTRAN Stock options exercised, Shares			23
Modification of stock options	339				339
ADTRAN RSUs and restricted stock vested	(1,106)		$ 9				(1,115)
ADTRAN RSUs and restricted stock vested, Shares			859
Redemption of redeemable non-controlling interest	371						371
Annual recurring compensation earned	(10,125)						(10,125)
ADTRAN Stock-based compensation expense	16,016	26			16,016	26
Ending Balance at Dec. 31, 2023	$ 605,257		$ 790		794,468		(231,706)	(5,825)	47,530
Ending Balance, Shares at Dec. 31, 2023	78,970		78,970
Net loss	$ (450,067)						(450,067)
Other comprehensive income (loss), net of tax	(36,276)								(36,276)
Deferred compensation adjustments, net of tax	259				(368)			627
ADTRAN Stock options exercised	$ 825		$ 1				824
ADTRAN Stock options exercised, Shares	139		139
Modification of stock options	$ (190)				(190)
ADTRAN RSUs and restricted stock vested	(1,022)		$ 4				(1,026)
ADTRAN RSUs and restricted stock vested, Shares			374
Redemption of redeemable non-controlling interest	2,986						2,986
Annual recurring compensation earned	(9,824)						(9,824)
Remeasurement of redeemable non-controlling interest	(1,175)				(1,175)
ADTRAN Stock-based compensation expense	14,825	$ 1,353			14,825	$ 1,353
Ending Balance at Dec. 31, 2024	$ 126,951		$ 795		$ 808,913		$ (688,813)	$ (5,198)	$ 11,254
Ending Balance, Shares at Dec. 31, 2024	79,483		79,483