Acquisitions (Pro Forma Information) (Details) - Dynamic Systems Inc. - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 29, 2019	Jun. 29, 2019
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net revenues	$ 74,199	$ 157,821
Pro forma net earnings attributable to VPG stockholders	$ 5,304	$ 17,135
Pro forma basic earnings per share attributable to VPG stockholders (in dollars per share)	$ 0.39	$ 1.27
Pro forma diluted earnings per share attributable to VPG stockholders (in dollars per share)	$ 0.39	$ 1.26

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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