Stock-Based Compensation (Stock Options) - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Jul. 22, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense	$ 4,200	$ 12,100	$ 12,200	$ 15,900
Unrecognized compensation expense related to stock options	$ 5,200		$ 5,200
Recognition period of unvested compensation expense			1 year 10 months 24 days
Options available for issuance under stockholders-approved equity plan	2.0		2.0
Aggregate intrinsic value based on fair market value	$ 736		$ 736		$ 16,251
Total pre-tax intrinsic value of options exercised			$ 50
Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options available for issuance under stockholders-approved equity plan	2.3		2.3
Adtran Networks SE [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized compensation expense related to stock options	$ 100		$ 100
Recognition period of unvested compensation expense			3 years 4 months 24 days
Options available for issuance under stockholders-approved equity plan						2.1
Aggregate intrinsic value based on fair market value	$ 746		$ 746		$ 1,222
Total pre-tax intrinsic value of options exercised			$ 200