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Redeemable Non-controlling Interest - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Redeemable Noncontrolling Interest [Line Items]
Accrued annual recurring compensation to redeemable non-controlling shareholders	$ 9.8	$ 10.1
Annual recurring compensation paid to redeemable non-controlling shareholders		10.1
DPLTA [Member]
Redeemable Noncontrolling Interest [Line Items]
Accrued annual recurring compensation to redeemable non-controlling shareholders	$ 9.8	$ 10.1
Adtran Networks [Member]
Redeemable Noncontrolling Interest [Line Items]
Equity ownership percentage	33.00%	34.70%

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- Definition

Accrued Annual Recurring Compensation Obligation

+ References

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- Definition

Payments for annual recurring compensation.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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