Debt Covenant, Cash And Cash Equivalents Threshold

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Term If Balloon Not Considered

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Consolidated Fixed Charge Coverage Ratio

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Consolidated Leverage Ratio

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Dispositions Not Reinvested, Percentage

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Receipts Greater than 250 Thousand Dollars, Non-ordinary Business, Percentage

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Stated Equity Issuance, Percentage

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long-term debt, Repayment of Principal in connection with Amendment

+ References

No definition available.

+ Details

Name:	kvhi_LongtermdebtRepaymentofPrincipalinconnectionwithAmendment
Namespace Prefix:	kvhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of Financial Covenants

+ References

No definition available.

+ Details

Name:	kvhi_NumberOfFinancialCovenants
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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Repayments of Long-term loan

+ References

No definition available.

+ Details

Name:	kvhi_RepaymentsofLongtermloan
Namespace Prefix:	kvhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Balance Type:	debit
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- Definition

The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity.

+ References

+ Details

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Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Period Type:

- Details

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Debt (Details)					6 Months Ended		27 Months Ended
Debt (Details)	Feb. 28, 2018 USD ($)	Jul. 02, 2014 USD ($)	Jul. 01, 2014	Apr. 06, 2009 USD ($)	Jun. 30, 2018 USD ($) covenant	Jun. 30, 2017 USD ($)	Jul. 01, 2019 USD ($)	Apr. 01, 2019 USD ($)	Dec. 31, 2017 USD ($)	Apr. 01, 2010 Contract
Debt Instrument [Line Items]
Long-term Debt					$ 43,565,000				$ 47,054,000
Long-term debt, Repayment of Principal in connection with Amendment					6,000,000
Long-term Debt, Current Maturities					4,990,000				2,482,000
Long-term Debt, Excluding Current Maturities					38,575,000				44,572,000
Line of Credit Facility, Current Borrowing Capacity					$ 15,000,000
Number of Financial Covenants \| covenant					2
Proceeds from Sale of Treasury Stock	$ 4,500,000				$ 4,500,000	$ 0
Repayments of Long-term loan	$ 2,250,000				3,400,000	$ 8,200,000
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Term			5 years
Line of Credit [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 40,875,000				44,275,000
Line of Credit [Member] \| Senior Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 80,000,000
Long-term Line of Credit		$ 30,000,000
Line of Credit Facility, Covenant Compliance, Maximum Consolidated Fixed Charge Coverage Ratio					1.25
Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Dispositions Not Reinvested, Percentage		100.00%
Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Stated Equity Issuance, Percentage		50.00%
Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Receipts Greater than 250 Thousand Dollars, Non-ordinary Business, Percentage		100.00%
Proceeds from Lines of Credit		$ 0
Line of Credit [Member] \| Senior Credit Facility [Member] \| Line of Credit [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Covenant Compliance, Maximum Consolidated Fixed Charge Coverage Ratio					1.25
Line of Credit [Member] \| Senior Credit Facility [Member] \| Line of Credit [Member] \| Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.75%
Line of Credit [Member] \| Senior Credit Facility [Member] \| Line of Credit [Member] \| Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Covenant Compliance, Maximum Consolidated Leverage Ratio					1.5
Line of Credit [Member] \| Senior Credit Facility [Member] \| Line of Credit [Member] \| Maximum \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.25%
Line of Credit [Member] \| Senior Credit Facility [Member] \| Line of Credit [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Covenant Compliance, Maximum Consolidated Leverage Ratio					1.50
Line of Credit [Member] \| Senior Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		15,000,000
Line of Credit [Member] \| Senior Credit Facility [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 65,000,000
Mortgages [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 2,690,000				$ 2,779,000
Mortgages [Member] \| Mortgage Loan On Headquarters Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Term				10 years
Debt Instrument, Periodic Payment, Principal					$ 15,000
Number of Financial Covenants \| covenant					1
Debt Instrument, Face Amount				$ 4,000,000
Debt Instrument, Term If Balloon Not Considered				20 years
Mortgages [Member] \| Mortgage Loan On Headquarters Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				2.00%
Mortgages [Member] \| Mortgage Loan On Headquarters Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Covenant, Cash And Cash Equivalents Threshold					$ 25,000,000
Mortgages [Member] \| Mortgage Loan On Headquarters Facility [Member] \| Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage					6.07%				6.07%	6.07%
Mortgages [Member] \| Mortgage Loan On Headquarters Facility [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage					5.91%				5.905%	5.91%
Scenario, Forecast [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal							$ 575,000
Scenario, Forecast [Member] \| Mortgages [Member] \| Mortgage Loan On Headquarters Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid								$ 2,551,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative, Number of Instruments Held \| Contract										2