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Summary of Significant Accounting Policies (Details) - USD ($) $ 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
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 775,892 | $ 780,972 | $ 761,030 | $ 716,795 | $ 673,462 | $ 677,941 | $ 643,164 | $ 604,801 | $ 3,034,689 | $ 2,599,368 | $ 2,317,328
Costs of products sold |  |  |  |  | 496,086 | 487,794 | 469,327 | 443,052 | 2,146,165 | 1,896,259 | 1,743,506
Gross profit | 219,690 | 236,296 | 227,238 | 205,300 | 177,376 | 190,147 | 173,837 | 161,749 | 888,524 | 703,109 | 573,822
Operating Income | 119,667 | 138,098 | 123,293 | 104,062 | 76,006 | 95,416 | 85,005 | 67,578 | 485,120 | 324,005 | 197,058
Total other income (expense) |  |  |  |  | (8,981) | (9,228) | (9,296) | (17,136) | (68,344) | (44,641) | (102,842)
Income before taxes |  |  |  |  | 67,025 | 86,188 | 75,709 | 50,442 | 416,776 | 279,364 | 94,216
Income tax expense |  |  |  |  | 244,526 | 21,605 | 19,300 | 13,493 | 70,239 | 298,924 | 44,843
Net earnings (loss) | 102,659 | 78,071 | 103,262 | 62,545 | (177,501) | 64,583 | 56,409 | 36,949 | 346,537 | (19,560) | 49,373
Less: net earnings attributable to noncontrolling interests | 240 | 195 | 165 | 179 | 156 | 179 | 219 | 230 | 779 | 784 | 581
Net earnings (loss) attributable to Vishay stockholders | $ 102,419 | $ 77,876 | $ 103,097 | $ 62,366 | (177,657) | 64,404 | 56,190 | 36,719 | $ 345,758 | (20,344) | 48,792
Minimum ownership of entities that do not have a non-controlling interest (in hundredths) | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Research and development expense |  |  |  |  |  |  |  |  | $ 72,885 | 67,153 | 66,842
Minimum number of months until maturity from original purchase date for a highly liquid investment to be considered a short-term investment (in months) |  |  |  |  |  |  |  |  | 3 months |  |
Bad debt expense |  |  |  |  |  |  |  |  | $ 2,570 | 301 | 61
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated cost to complete construction in progress | $ 127,000 |  |  |  |  |  |  |  | 127,000 |  |
Depreciation expense |  |  |  |  |  |  |  |  | 150,056 | 148,883 | 144,521
Cash and investments restricted for potential insurance claims | 11,046 |  |  |  | 9,438 |  |  |  | 11,046 | 9,438 |
Outstanding claim accrual | 0 |  |  |  | 560 |  |  |  | $ 0 | 560 |
Software [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 3 years |  |
Software [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 10 years |  |
Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 5 years |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 20 years |  |
Patents and acquired technology [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 7 years |  |
Patents and acquired technology [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 25 years |  |
Noncompete Agreements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 3 years |  |
Noncompete Agreements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 10 years |  |
Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  | 674,489 | 677,883 | 644,892 | 606,258 |  | 2,603,522 | 2,323,431
Costs of products sold |  |  |  |  | 497,988 | 488,610 | 471,929 | 445,383 |  | 1,903,910 | 1,753,648
Gross profit |  |  |  |  | 176,501 | 189,273 | 172,963 | 160,875 |  | 699,612 | 569,783
Operating Income |  |  |  |  | 72,536 | 92,328 | 82,036 | 64,688 |  | 311,588 | 101,717
Total other income (expense) |  |  |  |  | (5,511) | (6,140) | (6,327) | (14,246) |  | (32,224) | (7,501)
Income before taxes |  |  |  |  | 67,025 | 86,188 | 75,709 | 50,442 |  | 279,364 | 94,216
Income tax expense |  |  |  |  | 244,526 | 21,605 | 19,300 | 13,493 |  | 298,924 | 44,843
Net earnings (loss) |  |  |  |  | (177,501) | 64,583 | 56,409 | 36,949 |  | (19,560) | 49,373
Less: net earnings attributable to noncontrolling interests |  |  |  |  | 156 | 179 | 219 | 230 |  | 784 | 581
Net earnings (loss) attributable to Vishay stockholders |  |  |  |  | (177,657) | 64,404 | 56,190 | 36,719 |  | (20,344) | 48,792
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  | (1,027) | 58 | (1,728) | (1,457) |  | (4,154) | (6,103)
Costs of products sold |  |  |  |  | (1,902) | (816) | (2,602) | (2,331) |  | (7,651) | (10,142)
Gross profit |  |  |  |  | 875 | 874 | 874 | 874 |  | 3,497 | 4,039
Operating Income |  |  |  |  | 3,470 | 3,088 | 2,969 | 2,890 |  | 12,417 | 95,341
Total other income (expense) |  |  |  |  | (3,470) | (3,088) | (2,969) | (2,890) |  | (12,417) | (95,341)
Income before taxes |  |  |  |  | 0 | 0 | 0 | 0 |  | 0 | 0
Income tax expense |  |  |  |  | 0 | 0 | 0 | 0 |  | 0 | 0
Net earnings (loss) |  |  |  |  | 0 | 0 | 0 | 0 |  | 0 | 0
Less: net earnings attributable to noncontrolling interests |  |  |  |  | 0 | 0 | 0 | 0 |  | 0 | 0
Net earnings (loss) attributable to Vishay stockholders |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  | $ 0 | $ 0
Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful Life |  |  |  |  |  |  |  |  | 7 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful Life |  |  |  |  |  |  |  |  | 10 years |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful Life |  |  |  |  |  |  |  |  | 20 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful Life |  |  |  |  |  |  |  |  | 40 years |  |
Accounting Standards Update 2016-02 [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
New accounting pronouncement future impact on lease assets and liabilities | 90,000 |  |  |  |  |  |  |  | $ 90,000 |  |
Accounting Standards Update 2016-02 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
New accounting pronouncement future impact on lease assets and liabilities | $ 100,000 |  |  |  |  |  |  |  | $ 100,000 |  |

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