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

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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Fair value of financial and nonfinancial obligations.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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+ References

No definition available.

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