Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended			1 Months Ended
Apr. 24, 2014	Jul. 04, 2014	Apr. 04, 2014	May 31, 2013 Construction in Progress Satellite ViaSat-2 [Member] Capital Addition Purchase Commitments [Member]
Loss Contingencies [Line Items]
Purchase price under agreement				$ 358.0
Amount awarded in damages for patent infringement and breach of contract	283.0
Total U.S. government contract-related reserves balance		$ 6.7	$ 6.7

Amount of loss contingency liability.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant