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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Taxes [Line Items] |  |  |  |
Gross Massachusetts tax research other tax credit carryforwards | $ 8,762 us-gaap_TaxCreditCarryforwardAmount |  |  |
Tax credit expiration period | 2028 |  |  |
Gross unrecognized tax benefits excluding interest and penalties | 19,610 us-gaap_UnrecognizedTaxBenefits | 47,684 us-gaap_UnrecognizedTaxBenefits | 40,674 us-gaap_UnrecognizedTaxBenefits | 36,540 us-gaap_UnrecognizedTaxBenefits
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate | 11,533 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |
Net benefit to income tax expense, excluding interest and penalties, due to discrete reserve releases | 13,380 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions |  |  |
Accrued interest on unrecognized tax benefits | 578 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 2,159 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 1,571 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |
Unrecognized tax benefits related to various U.S. federal, state and foreign tax positions | 134 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |  |  |
Income tax examination, description | The Company is subject to examination by U.S. federal, state and foreign tax authorities. The United States Internal Revenue Service commenced an examination of the Company's U.S. federal tax filings for open tax years 2007 through 2009 during the quarter ended June 30, 2012. |  |  |
Change in valuation allowance | (339)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | (395)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 1,022 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |
Undistributed earnings in foreign subsidiaries | 471,155 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |
Income tax holiday tax rate | 9.00%mksi_IncomeTaxHolidayTaxRate | 7.00%mksi_IncomeTaxHolidayTaxRate | 10.00%mksi_IncomeTaxHolidayTaxRate |
Other Operations [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax holiday tax rate | 16.00%mksi_IncomeTaxHolidayTaxRate / us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis = mksi_OtherOperationsMember |  |  |
Earliest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax examination period | 2007 |  |  |
Open tax year | 2011 |  |  |
Latest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax examination period | 2009 |  |  |
Open tax year | 2013 |  |  |
2015 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
U.S. Federal capital loss carryforwards | 59,275 mksi_FederalCapitalLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = mksi_OperatingLossCarryforwardsExpiringTwoThousandFifteenMember |  |  |
Net operating Loss | $ 9,869 us-gaap_OperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = mksi_OperatingLossCarryforwardsExpiringTwoThousandFifteenMember |  |  |

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