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Fair Value Measurements - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024
Satellite Performance Incentives Obligation [Member] | Satellites [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Expiration year of in-orbit satellite performance incentive obligation | 2028 |
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities measured at fair value on a recurring basis | $ 0 | $ 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Satellite Performance Incentives Obligation [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Satellite performance incentives obligation | 14,800,000 | 15,900,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | 2025 Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of long term debt | 679,000,000 | 680,800,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | 2027 Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of long term debt | 535,500,000 | 564,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | 2028 Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of long term debt | 303,000,000 | 307,500,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | 2031 Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of long term debt | 484,700,000 | 529,900,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Ex-Im Credit Facility [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of long term debt | 28,800,000 | 38,500,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Inmarsat Senior Secured Notes 2026 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of long term debt | $ 2,010,000,000.00 | $ 2,040,000,000.00

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