Certain Relationships and Related-Party Transactions - Additional Information (Detail) (Loral - beam sharing agreement [Member])	Jan. 03, 2014
Loral - beam sharing agreement [Member]
Related Party Transaction [Line Items]
Percentage of total costs under the beam sharing agreement for which Loral was responsible	15.00%

Amount of transactions with related party during the financial reporting period defined in percent.

No definition available.

Name:	vsat_RelatedPartyTransactionPercentAmountsOfTransaction
Namespace Prefix:	vsat_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant