Debt issuance costs, amortization period.

No definition available.

Name:	mksi_DebtIssuanceCostsAmortizationPeriod
Namespace Prefix:	mksi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred financing costs in long term debt.

+ References

No definition available.

+ Details

Name:	mksi_DeferredFinancingCostsInLongTermDebt
Namespace Prefix:	mksi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Initial commitment fee percentage.

+ References

No definition available.

+ Details

Name:	mksi_InitialCommitmentFeePercentage
Namespace Prefix:	mksi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility minimum additional borrowing capacity.

+ References

No definition available.

+ Details

Name:	mksi_LineOfCreditFacilityMinimumAdditionalBorrowingCapacity
Namespace Prefix:	mksi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Loan Voluntary Prepayment Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	mksi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Minimum percentage of earnings before interest taxes depreciation and amortization.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Original issue discount percentage of principal amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	mksi_
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Balance Type:	na
Period Type:	duration

- Definition

Percentage of aggregate amount of all commitments.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Prepayment premium percentage of aggregate principal amount.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Scheduled quarterly payments percentage of original principal amount.

+ References

No definition available.

+ Details

Name:	mksi_ScheduledQuarterlyPaymentsPercentageOfOriginalPrincipalAmount
Namespace Prefix:	mksi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the total principal payments made during the annual reporting period.

+ References

+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

Name:	us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MaximumMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=mksi_AnnualStepDownMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=mksi_StepUpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mksi_TermSofrBorrowingsMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mksi_BorrowingsUnderEuroTrancheBMember
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Name:	us-gaap_DebtInstrumentAxis=mksi_TermLoansUnderTermLoanFacilityMember
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Name:	us-gaap_DebtInstrumentAxis=us-gaap_RevolvingCreditFacilityMember
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Name:	srt_RangeAxis=srt_MinimumMember
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Debt - Credit Facility - Additional Information (Detail)					12 Months Ended
	Oct. 31, 2023 USD ($)	Oct. 03, 2023 USD ($)	Dec. 12, 2022 USD ($)	Aug. 17, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Debt instrument, interest rate terms					Borrowings under the Credit Facilities bear interest at a rate per annum equal to, at the Company’s option, any of the following, plus, in each case, an applicable margin: (a) with respect to the USD Tranche A, the Revolving Facility and, prior to the effectiveness of the First Amendment (as defined below), the USD Tranche B, (x) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the prime rate quoted in The Wall Street Journal, or (3) a forward-looking term rate based on Term SOFR (plus an applicable credit spread adjustment) for an interest period of one month, plus 1.00%; and (y) a Term SOFR rate (plus an applicable credit spread adjustment) for the interest period relevant to such borrowing, subject to a rate floor of (I) with respect to the USD Tranche B, 0.50% and (II) with respect to the USD Tranche A and the Revolving Facility, 0.0%; and (b) with respect to the Euro Tranche B, a Euro Interbank Offered Rate (“EURIBOR”) rate determined by reference to the costs of funds for Euro deposits for the interest period relevant to such borrowing adjusted for certain additional costs, subject to a EURIBOR rate floor of 0.0%.
Initial commitment fee percentage					0.375%
Loss on extinguishment of debt					$ 8,000,000	$ 0	$ 0
Long-term debt, net					$ 4,696,000,000	$ 4,834,000,000
Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio					5.25
Annual Step-Down [Member]
Debt Instrument [Line Items]
Leverage ratio					0.25
Step-Up [Member]
Debt Instrument [Line Items]
Leverage ratio					0.5
Step-Up [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio					5.5
Term SOFR Borrowings [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					2.50%
Borrowings under Euro Tranche B [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					3.00%
Term Loans Under Term Loan Facility [Member]
Debt Instrument [Line Items]
Deferred financing fees and original issue discount fees					$ 242,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Prepayment premium percentage of aggregate principal amount					1.00%
Debt issuance costs				$ 7,000,000
Debt issuance costs, amortization period				4 years
Borrowings outstanding					$ 0
Maturity date					Aug. 31, 2027
Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Percentage of aggregate amount of all commitments					35.00%
Term Loan Facility [Member]
Debt Instrument [Line Items]
Line of credit facility minimum additional borrowing capacity					$ 1,011,000,000
Minimum percentage of consolidated EBITDA					75.00%
Total principal prepayments					$ 200,000,000
Scheduled principal payments					109,000,000
Outstanding principal amount					$ 4,953,000,000
Weighted average interest rate					7.70%
Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					0.50%
Term SOFR Rate (Plus Applicable Credit Spread Adjustment) [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					1.00%
EURIBOR Rate Floor [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					0.00%
Base Rate [Member] \| Borrowings Under Revolving Facility [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					1.50%
Atotech [Member]
Debt Instrument [Line Items]
Borrowing capacity				$ 500,000,000
USD Tranche A [Member]
Debt Instrument [Line Items]
Borrowing capacity				1,000,000,000
Loan voluntary prepayment amount	$ 100,000,000		$ 100,000,000
Scheduled quarterly payments percentage of original principal amount					1.25%
Maturity date					Aug. 31, 2027
USD Tranche A [Member] \| Years 3 and 4 [Member]
Debt Instrument [Line Items]
Scheduled quarterly payments percentage of original principal amount					1.875%
USD Tranche A [Member] \| Year 5 [Member]
Debt Instrument [Line Items]
Scheduled quarterly payments percentage of original principal amount					2.50%
USD Tranche A [Member] \| Term SOFR Borrowings [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					2.50%
USD Tranche A [Member] \| Original Issue Discount [Member]
Debt Instrument [Line Items]
Original issue discount percentage of principal amount					0.25%
USD Tranche A [Member] \| Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					0.00%
USD Tranche A [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					1.50%
USD Tranche B [Member]
Debt Instrument [Line Items]
Borrowing capacity				3,600,000,000
Loss on extinguishment of debt					$ 8,000,000
Prepayment premium percentage of aggregate principal amount					1.00%
Scheduled quarterly payments percentage of original principal amount					0.25%
Borrowings outstanding		$ 3,564,000,000
Maturity date					Aug. 31, 2029
USD Tranche B [Member] \| Term SOFR Borrowings [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					2.75%
USD Tranche B [Member] \| Term SOFR Borrowings [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		2.50%
USD Tranche B [Member] \| Term SOFR Borrowings [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		2.75%
USD Tranche B [Member] \| Original Issue Discount [Member]
Debt Instrument [Line Items]
Original issue discount percentage of principal amount		0.25%			2.00%
USD Tranche B [Member] \| Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					0.50%
USD Tranche B [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					1.75%
USD Tranche B [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		1.50%
USD Tranche B [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		1.75%
USD Tranche B First Ammendment [Member]
Debt Instrument [Line Items]
Deferred financing fees and original issue discount fees					$ 11,000,000
Deferred financing costs in long-term debt					$ 9,000,000
Euro Tranche B [Member]
Debt Instrument [Line Items]
Borrowing capacity				$ 600,000,000
Scheduled quarterly payments percentage of original principal amount					0.25%
Maturity date					Aug. 31, 2029
Euro Tranche [Member] \| Original Issue Discount [Member]
Debt Instrument [Line Items]
Original issue discount percentage of principal amount					2.00%
First Lien Net Leverage Ratio [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio					1