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Commitments and Contingencies - Summary of Consideration Assigned to Identifiable Elements (Detail) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended
Sep. 05, 2014
Gain Contingencies [Line Items]  
Litigation settlement amount $ 108,712us-gaap_LitigationSettlementAmount
Interest income [Member]  
Gain Contingencies [Line Items]  
Litigation settlement amount 4,866us-gaap_LitigationSettlementAmount
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember
Implied license [Member]  
Gain Contingencies [Line Items]  
Litigation settlement amount 85,132us-gaap_LitigationSettlementAmount
/ us-gaap_GainContingenciesByNatureAxis
= vsat_ImpliedLicenseMember
Other damages [Member]  
Gain Contingencies [Line Items]  
Litigation settlement amount $ 18,714us-gaap_LitigationSettlementAmount
/ us-gaap_GainContingenciesByNatureAxis
= vsat_OtherDamagesMember