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Summary of Quarterly Financial information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Operations data:                      
Net revenues $ 76,982 [1] $ 75,490 [1] $ 74,231 [1] $ 73,091 [1] $ 69,439 [1] $ 62,805 [1] $ 62,319 [1] $ 59,787 [1] $ 299,794 $ 254,350 $ 224,929
Gross profit 30,816 [1] 30,580 [1] 31,366 [1] 28,505 [1] 26,740 [1] 24,267 [1] 24,759 [1] 22,517 [1] 121,267 98,283 82,809
Operating income 7,091 [1] 10,631 [1] 11,315 [1] 8,186 [1] 7,160 [1] 5,530 [1] 5,853 [1] 3,945 [1] 37,223 22,488 11,267
Net earnings 3,437 [1] 7,567 [1] 7,683 [1] 4,958 [1] 4,450 [1] 4,325 [1] 3,616 [1] 2,003 [1] 23,645 14,394 6,408
Less: net earnings attributable to noncontrolling interests 19 [1] 20 [1] (10) [1] (30) [1] (26) [1] 70 [1] (3) [1] 8 [1] (1) 49 4
Net earnings attributable to VPG stockholders $ 3,418 [1] $ 7,547 [1] $ 7,693 [1] $ 4,988 [1] $ 4,476 [1] $ 4,255 [1] $ 3,619 [1] $ 1,995 [1] $ 23,646 $ 14,345 $ 6,404
Per Share Data:                      
Basic earnings per share (in dollars per share) $ 0.25 [1],[2] $ 0.56 [1],[2] $ 0.57 [1],[2] $ 0.37 [1],[2] $ 0.34 [1],[2] $ 0.32 [1],[2] $ 0.27 [1],[2] $ 0.15 [1],[2] $ 1.76 $ 1.08 $ 0.49
Diluted earnings per share (in dollars per share) $ 0.25 [1],[2] $ 0.56 [1],[2] $ 0.57 [1],[2] $ 0.37 [1],[2] $ 0.33 [1],[2] $ 0.32 [1],[2] $ 0.27 [1],[2] $ 0.15 [1],[2] $ 1.75 $ 1.07 $ 0.48
Certain Items Recorded during the Quarters:                      
Acquisition purchase accounting adjustments [1] $ 0 $ 0 $ 0 $ 0 $ 49 $ 42 $ 0 $ 0      
Net proceeds from lease termination [1] 0 0 0 0 0 (1,544) 0 0      
Tax rebate [1] 0 0 0 0 189   0 0      
Impairment of goodwill and indefinite-lived intangibles 2,820 [1] 0 [1] 0 [1] 0 [1] 0 [1] 0 [1] 0 [1] 0 [1] $ 2,820 $ 0 $ 0
UK pension settlement [1] 673 0 0 0 0 0 0 0      
Restructuring costs 0 [1] 228 [1] 61 [1] 0 [1] 752 [1] 423 [1] 315 [1] 554 [1] $ 289 $ 2,044 $ 2,666
Tax effect of reconciling items and discrete tax items [1] $ (377) $ 35 $ 9 $ 0 $ 165 $ (394) $ 13 $ 42      
[1] The Company reports interim financial information for the 13-week periods beginning on a Sunday and ending on a Saturday, except for the first fiscal quarter, which always begins on January 1, and the fourth fiscal quarter, which always ends on December 31. The first, second, third, and fourth quarters of 2018 ended on March 31, June 30, September 29, and December 31, respectively. The first, second, third, and fourth quarters of 2017 ended on April 1, July 1, September 30, and December 31, respectively.
[2] Quarterly amounts may not agree in total to the corresponding annual amounts due to rounding.