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Subsequent Events - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  |  |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 07, 2022 $ / shares | Oct. 18, 2022 $ / shares shares | Jul. 15, 2022 shares | Aug. 30, 2021 | Sep. 30, 2022 shares | Dec. 31, 2022 USD ($) | Nov. 03, 2022 USD ($) | Oct. 18, 2022 € / shares | Dec. 31, 2021 shares
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Exchange offer settled date |  |  | Jul. 15, 2022 |  |  |  |  |  |
Common stock, shares outstanding | shares |  |  |  |  | 77,619,000 |  |  |  | 49,063,000
Scenario Forecast [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Quarterly dividend payable, aggregate amount | $ |  |  |  |  |  | $ 7.0 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Common stock dividends per share declared | $ / shares | $ 0.09 |  |  |  |  |  |  |  |
Subsequent Event [Member] | DPLTA [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Percentage of required voting interest |  | 75.00% |  |  |  |  |  | 75.00% |
Subsequent Event [Member] | Cross-Currency Swap Arrangement [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Aggregate notional amount | $ |  |  |  |  |  |  | $ 160.0 |  |
Subsequent Event [Member] | Cross-Currency Swap Arrangement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Aggregate notional amount, daily fixed forward conversion rate |  |  |  |  |  |  | 0.98286 |  |
Subsequent Event [Member] | Cross-Currency Swap Arrangement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Aggregate notional amount, daily fixed forward conversion rate |  |  |  |  |  |  | 1.0329 |  |
Subsequent Event [Member] | Cross-Currency Swap Arrangement [Member] | Eight Quarterly Tranches [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Aggregate notional amount | $ |  |  |  |  |  |  | $ 20.0 |  |
ADVA Optical Networking SE [Member] | Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Number of additional shares authorized to purchase | shares |  | 15,346,544 |  |  |  |  |  |  |
ADVA Optical Networking SE [Member] | Subsequent Event [Member] | DPLTA [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Price per share | $ / shares |  | $ 17.21 |  |  |  |  |  |  |
Annual recurring compensation per share |  |  |  |  |  |  |  | € 0.59 |
Annual recurring compensation net per share |  |  |  |  |  |  |  | € 0.52 |
ADVA Optical Networking SE [Member] | Subsequent Event [Member] | DPLTA [Member] | Annuity Interest Rate 3.00% [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Annual recurring compensation per share | $ / shares |  | 0.59 |  |  |  |  |  |  |
Annual recurring compensation net per share | $ / shares |  | $ 0.52 |  |  |  |  |  |  |
Annuity interest rate |  | 3.00% |  |  |  |  |  | 3.00% |
ADVA Optical Networking SE [Member] | Subsequent Event [Member] | DPLTA [Member] | Annuity Interest Rate 3.25% [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Annual recurring compensation per share |  |  |  |  |  |  |  | € 0.62 |
Annual recurring compensation net per share |  |  |  |  |  |  |  | € 0.54 |
Annuity interest rate |  | 3.25% |  |  |  |  |  | 3.25% |
ADVA Optical Networking SE [Member] | Subsequent Event [Member] | DPLTA [Member] | Annuity Interest Rate 5.50% [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Annual recurring compensation per share |  |  |  |  |  |  |  | € 1 |
Annual recurring compensation net per share |  |  |  |  |  |  |  | € 0.87 |
Annuity interest rate |  | 5.50% |  |  |  |  |  | 5.50% |
Acorn HoldCo, Inc., [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Date of Acquisition Agreement |  |  |  | Aug. 30, 2021 |  |  |  |  |
Number of shares subject to additional assumed options | shares |  |  | 100,000 |  |  |  |  |  |
Common stock, shares outstanding | shares |  |  | 34,000,000 |  | 33,957,538 |  |  |  |
Percentage of outstanding bearer shares |  |  | 65.43% |  | 65.35% |  |  |  |

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