Debt Instrument, Threshold For Extension, Amount

No definition available.

Name:	kgs_DebtInstrumentThresholdForExtensionAmount
Namespace Prefix:	kgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line Of Credit Facility, Threshold Consecutive Trading Days

+ References

No definition available.

+ Details

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Namespace Prefix:	kgs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Threshold, Minimum Amount

+ References

No definition available.

+ Details

Name:	kgs_LineOfCreditFacilityThresholdMinimumAmount
Namespace Prefix:	kgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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

- 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.

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Namespace Prefix:	us-gaap_
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.

+ References

+ Details

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

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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- Details

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Namespace Prefix:
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Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Debt and Credit Facilities - ABL Facility (Details) - USD ($)	6 Months Ended
	Jun. 30, 2026	Apr. 02, 2026	Dec. 31, 2025	Sep. 05, 2025
Debt Instrument [Line Items]
Long-term debt	$ 2,725,272,000		$ 2,555,645,000
ABL Facility
Debt Instrument [Line Items]
Letters of credit outstanding	$ 14,600,000
Line of Credit \| ABL Facility
Debt Instrument [Line Items]
Variable interest rate	6.03%		5.72%
Line of Credit \| Maximum \| ABL Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%
Line of Credit \| Maximum \| ABL Facility \| Prime Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Line of Credit \| Minimum \| ABL Facility
Debt Instrument [Line Items]
Commitment fee	0.25%
Line of Credit \| Minimum \| ABL Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Line of Credit \| Minimum \| ABL Facility \| Prime Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.75%
2031 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Threshold for extension, amount		$ 50,000,000.0
ABL Facility \| Line of Credit
Debt Instrument [Line Items]
Line of credit facility, threshold, minimum amount	$ 100,000,000.0
Line of credit, maximum borrowing capacity				$ 2,000,000,000.0
Long-term debt	$ 380,900,000
ABL Facility \| Line of Credit \| Maximum
Debt Instrument [Line Items]
Number of consecutive business days	5 days