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Revenues - Contract Assets and Liabilities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Movement in Contract Assets and Liabilities [Roll Forward]
Unbilled revenue, beginning balance	$ 824
Increase in unbilled revenue	140
Unbilled revenue, ending balance	964
Accrued customer advances, beginning balance	3,229
Accrued customer advances, ending balance	5,328
Increase in accrued customer advances	$ 2,099

X

- Definition

Refundable consideration, usually cash, held by the entity pending satisfactory completion of the entity's obligations or pending the closing of a contract.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15a)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

X

- Definition

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 310
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=68054760&loc=d3e55302-109406

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3(c)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

X

- Definition

Contract with Customer, Asset, Increase (Decrease) in Unbilled Revenue

+ References

No definition available.

+ Details

Name:	vpg_ContractwithCustomerAssetIncreaseDecreaseinUnbilledRevenue
Namespace Prefix:	vpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Accrued Customer Advances

+ References

No definition available.

+ Details

Name:	vpg_ContractwithCustomerLiabilityIncreaseDecreaseforContractAcquiredinAccruedCustomerAdvances
Namespace Prefix:	vpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Movement in Contract Assets and Liabilities [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	vpg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration