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Summary of Significant Accounting Policies - Intangible Assets (Details)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended 20 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
Intellectual property
Jul. 31, 2013
Headland Media Limited
USD ($)
May 11, 2013
Headland Media Limited
USD ($)
May 11, 2013
Headland Media Limited
GBP (£)
Dec. 31, 2014
Headland Media Limited
Subscriber relationships
Dec. 31, 2014
Headland Media Limited
Distribution rights
Dec. 31, 2014
Headland Media Limited
Internally developed software
Dec. 31, 2014
Headland Media Limited
Proprietary Content
Jul. 02, 2014
Videotel
USD ($)
Dec. 31, 2014
Videotel
Subscriber relationships
Dec. 31, 2014
Videotel
Internally developed software
Dec. 31, 2014
Videotel
Proprietary Content
Dec. 31, 2014
Videotel
Off-Market Favorable Lease
Finite-Lived Intangible Assets [Line Items]                                
Business Combination, Contingent Consideration, Liability         $ 0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= kvhi_HeadlandMediaLimitedMember
$ 24,169us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= kvhi_HeadlandMediaLimitedMember
£ 15,576us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= kvhi_HeadlandMediaLimitedMember
        $ 47,446us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= kvhi_VideotelMember
       
Estimated Useful Life       7 years       10 years 15 years 3 years 2 years   8 years 4 years 5 years 5 years
ERROR in label resolution. $ 10,400us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual $ 14,400us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual $ 23,200us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual