v3.20.2

Marketable Investment Securities - Narrative (Details) $ in Millions | Sep. 30, 2020 USD ($)
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Investments, Debt and Equity Securities [Abstract] |
Available-for-sale securities with contractual maturities of one year of less | $ 1,900.0
Available-for-sale debt securities with contractual maturities greater than one year | $ 7.9

X
- Definition Amount of available-for-sale debt securities at fair value maturing after the next rolling twelve months following the latest balance sheet presented. + References No definition available. + Details
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Namespace Prefix: | sats_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration