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Revenue - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Net receivables related to contracts with customers	$ 77.0	$ 112.1
Net receivables related to rental contracts and other	89.7	103.0
Deferred rent revenue	2.9
Customer deposits	19.5	$ 25.9
Performance obligation satisfied, revenue recognized	$ 25.8
Expected duration	1 year

X

- Definition

Contract With Customer, Customer Deposits, Timing

+ References

No definition available.

+ Details

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

X

- Definition

Contract With Customer, Liability, Current, Customer Deposits

+ References

No definition available.

+ Details

Name:	ctos_ContractWithCustomerLiabilityCurrentCustomerDeposits
Namespace Prefix:	ctos_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contract With Customer, Liability, Current, Deferred Rent

+ References

No definition available.

+ Details

Name:	ctos_ContractWithCustomerLiabilityCurrentDeferredRent
Namespace Prefix:	ctos_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contract with Customer, Liability, Customer Deposits, Revenue Recognized

+ References

No definition available.

+ Details

Name:	ctos_ContractWithCustomerLiabilityCustomerDepositsRevenueRecognized
Namespace Prefix:	ctos_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Other Receivable, After Allowance For Credit Loss

+ References

No definition available.

+ Details

Name:	ctos_ContractWithCustomerOtherReceivableAfterAllowanceForCreditLoss
Namespace Prefix:	ctos_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481058/954-310-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479837/606-10-45-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479837/606-10-45-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-8

+ Details

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

X

- References

No definition available.

+ Details

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