Debt instrument unused borrowing capacity fee percentage.

No definition available.

Name:	lfst_DebtInstrumentUnusedBorrowingCapacityFeePercentage
Namespace Prefix:	lfst_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

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

- 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

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

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

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+ Details

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

- 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

+ Details

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

- Definition

Date the credit facility terminates, in YYYY-MM-DD format.

+ References

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Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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.

+ References

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+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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

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+ Details

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

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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

- Definition

Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis.

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

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=lfst_TwoThousandTwentyTwoCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ExtinguishmentOfDebtAxis=lfst_DelayedDrawnTermLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
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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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Period Type:

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Period Type:

Long-term Debt - Additional Information (Detail) - USD ($)		9 Months Ended
	May 04, 2022	Sep. 30, 2023	Oct. 31, 2023	Apr. 01, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt, fair value		$ 263,473,000			$ 235,049,000
Long term debt fair value		257,143,000			233,964,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Loan withdrawal amount				$ 25,000,000
Revolving loan outstanding amount				$ 25,000,000
2022 Credit Agreement [Member]
Debt Instrument [Line Items]
Term loan facility	$ 200,000,000
Debt instrument, basis spread on variable rate	1.00%
2022 Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Loan withdrawal amount		0			0
Maximum borrowing capacity		$ 50,000,000
Unused revolving loan commitment fee percentage		0.005
Revolving loan outstanding amount		$ 0			0
Revolving loan,expiration date		May 16, 2027
Term Loans
Debt Instrument [Line Items]
Long-term debt, maturities, repayment terms	May 16, 2028
Long term debt fair value	$ 200,000,000	$ 198,000,000			199,500,000
Delayed Draw Term Loan
Debt Instrument [Line Items]
Long term debt fair value		$ 59,143,000			$ 34,464,000
Delayed Draw Term Loan \| Subsequent Event [Member]
Debt Instrument [Line Items]
Long term debt fair value			$ 8,000,000
Maximum \| 2022 Credit Agreement [Member]
Debt Instrument [Line Items]
Loan withdrawal amount	50,000,000
Revolving loan outstanding amount	50,000,000
Maximum \| Delayed Draw Term Loan \| 2022 Credit Agreement [Member]
Debt Instrument [Line Items]
Aggregate loan commitment amount	$ 100,000,000
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| 2022 Credit Agreement [Member]
Debt Instrument [Line Items]
Long-term debt, maturities, repayment terms	May 16, 2027
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Minimum \| 2022 Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.75%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Minimum \| 2022 Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.00%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Maximum \| 2022 Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	4.50%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Maximum \| 2022 Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		3.25%
Federal Funds Rate \| 2022 Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.50%
Federal Funds Rate \| 2022 Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		0.50%
Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.50%
Base Rate \| 2022 Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.25%