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Summary of Significant Accounting Policies - Summary of Impact of Revision to Specific Line Items in Condensed Consolidated Balance Sheets, Condensed Consolidated Statements of Loss, and Condensed Consolidated Statements of Comprehensive Loss (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Accrued Expenses and Other Liabilities $ 34,482 $ 34,904 $ 35,001 $ 16,359 $ 15,706 $ 15,640 $ 34,904 $ 15,706 $ 34,482 $ 16,359 $ 36,204  
Redeemable Non-Controlling Interest 421,776 442,122 442,146 442,212 442,218 442,238 442,122 442,218 421,776 442,212 442,152  
Accumulated Other Comprehensive Income 47,377 28,280 29,661 12,078 41,485 34,527 28,280 41,485 47,377 12,078 47,465  
Retained Earnings (635,164) (606,656) (557,126) (122,534) (37,073) 8,781 (606,656) (37,073) (635,164) (122,534) (232,905)  
Total Equity 213,994 219,954 267,025 675,651 786,409 820,938 219,954 786,409 213,994 675,651 604,829 $ 1,303,613
Total Liabilities, Redeemable Non-Controlling Interest and Equity 1,273,146 1,290,782 1,327,906 1,742,169 1,882,938 1,938,595 1,290,782 1,882,938 1,273,146 1,742,169 1,682,512  
Less: Net Income (Loss) attributable to non-controlling interest 2,382 [1] 2,504 2,531 2,561 [1] 2,534 (715) 5,035 1,819 7,417 [1] 4,380 [1] 6,946  
Net Income (Loss) $ (31,239) $ (49,515) $ (324,201) $ (78,210) $ (38,749) $ (39,738) $ (373,716) $ (78,487) $ (404,955) $ (156,697) $ (266,289)  
Loss per common share attributable to ADTRAN Holdings, Inc. - basic $ (0.36) [2] $ (0.63) $ (4.12) $ (1) $ (0.5) $ (0.51) $ (4.74) $ (1) $ (5.1) [2] $ (2) $ (3.39)  
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted $ (0.36) [2] $ (0.63) $ (4.12) $ (1) $ (0.5) $ (0.51) $ (4.74) $ (1) $ (5.1) [2] $ (2) $ (3.39)  
Foreign currency translation gain (loss) $ 18,988 $ (1,374) $ (17,744) $ (29,715) $ 6,941 $ 8,679 $ (19,118) $ 15,620 $ (130) $ (14,095) $ 22,757  
Other Comprehensive Income (Loss), net of tax 19,097 (1,381) (17,804) (29,407) 6,958 8,783 (19,185) 15,741 (88) (13,666) 21,721  
Comprehensive Loss, net of tax (9,760) (48,392) (339,474) (105,056) (29,257) (31,670) (387,866) (60,927) (397,626) (165,983) (237,622)  
Less: Comprehensive Income attributable to non-controlling interest, net of tax 2,382 2,504 2,531 2,561 2,534 (333) 5,035 2,201 7,417 4,762 7,328  
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax $ (12,142) (50,896) (342,005) (107,617) (31,791) (31,337) (392,901) (63,128) $ (405,043) (170,745) (244,950)  
As Previously Reported [Member]                        
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Accrued Expenses and Other Liabilities   36,307 36,404 17,408 16,401 15,986 36,307 16,401   17,408 37,607  
Redeemable Non-Controlling Interest   439,743 441,635 431,921 445,462 442,668 439,743 445,462   431,921 451,756  
Accumulated Other Comprehensive Income   28,274 29,656 12,075 41,483 34,526 28,274 41,483   12,075 47,461  
Retained Earnings   (606,375) (558,363) (113,289) (41,010) 8,006 (606,375) (41,010)   (113,289) (243,908)  
Total Equity   220,229 265,783 684,893 782,470 820,162 220,229 782,470   684,893 593,822  
Total Liabilities, Redeemable Non-Controlling Interest and Equity   1,290,782 1,327,906 1,742,169 1,882,938 1,938,595 1,290,782 1,882,938   1,742,169 1,682,512  
Less: Net Income (Loss) attributable to non-controlling interest   2,854 2,880 2,914 2,882 (370) 5,734 2,512   5,426 8,345  
Net Income (Loss)   $ (49,865) $ (324,550) $ (78,563) $ (39,097) $ (40,083) $ (374,415) $ (79,180)   $ (157,743) $ (267,688)  
Loss per common share attributable to ADTRAN Holdings, Inc. - basic   $ (0.63) $ (4.12) $ (1) $ (0.5) $ (0.51) $ (4.75) $ (1.01)   $ (2.01) $ (3.41)  
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted   $ (0.63) $ (4.12) $ (1) $ (0.5) $ (0.51) $ (4.75) $ (1.01)   $ (2.01) $ (3.41)  
Foreign currency translation gain (loss)   $ (1,375) $ (17,745) $ (29,716) $ 6,940 $ 8,678 $ (19,120) $ 15,618   $ (14,098) $ 22,753  
Other Comprehensive Income (Loss), net of tax   (1,382) (17,805) (29,408) 6,957 8,782 (19,187) 15,739   (13,669) 21,717  
Comprehensive Loss, net of tax   (48,393) (339,475) (105,057) (29,258) (31,671) (387,868) (60,929)   (165,986) (237,626)  
Less: Comprehensive Income attributable to non-controlling interest, net of tax   2,854 2,880 2,914 2,882 12 5,734 2,894   5,808 8,727  
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax   (51,247) (342,355) (107,971) (32,140) (31,683) (393,602) (63,823)   (171,794) (246,353)  
Revision [Member]                        
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Accrued Expenses and Other Liabilities   (1,403) (1,403) (1,049) (695) (346) (1,403) (695)   (1,049) (1,403)  
Redeemable Non-Controlling Interest   2,379 511 10,291 (3,244) (430) 2,379 (3,244)   10,291 (9,604)  
Accumulated Other Comprehensive Income   6 5 3 2 1 6 2   3 4  
Retained Earnings   (281) 1,237 (9,245) 3,937 775 (281) 3,937   (9,245) 11,003  
Total Equity   (275) 1,242 (9,242) 3,939 776 (275) 3,939   (9,242) 11,007  
Less: Net Income (Loss) attributable to non-controlling interest   (350) (349) (353) (348) (345) (699) (693)   (1,046) (1,399)  
Net Income (Loss)   350 349 353 348 345 $ 699 $ 693   $ 1,046 $ 1,399  
Loss per common share attributable to ADTRAN Holdings, Inc. - basic             $ 0.01 $ 0.01   $ 0.01 $ 0.02  
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted             $ 0.01 $ 0.01   $ 0.01 $ 0.02  
Foreign currency translation gain (loss)   1 1 1 1 1 $ 2 $ 2   $ 3 $ 4  
Other Comprehensive Income (Loss), net of tax   1 1 1 1 1 2 2   3 4  
Comprehensive Loss, net of tax   1 1 1 1 1 2 2   3 4  
Less: Comprehensive Income attributable to non-controlling interest, net of tax   (350) (349) (353) (348) (345) (699) (693)   (1,046) (1,399)  
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax   $ 351 $ 350 $ 354 $ 349 $ 346 $ 701 $ 695   $ 1,049 $ 1,403  
[1] For the three and nine months ended September 30, 2024, we accrued $2.4 million and $7.4 million, respectively, net income attributable to non-controlling interest, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA. For the three and nine months ended September 30, 2023, we accrued $2.6 million and $7.6 million, respectively, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA, partially offset by a $3.2 million net loss attributable to non-controlling interests pre-DPLTA for the nine months ended September 30, 2023.
[2] Loss per common share attributable to ADTRAN Holdings, Inc. - basic and diluted - reflects a $3.0 million effect of redemption of RNCI for the three and nine months ended September 30, 2024. See Note 15 for additional information.