Represents the Total Net Leverage ratio covenant as defined in the Credit Agreement.

No definition available.

Name:	catm_DebtInstrumentTotalNetLeverageRatioCovenant
Namespace Prefix:	catm_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the Total Net Leverage ratio covenant requirement as it relates to restricted payments, as defined in the Credit Agreement.

+ References

No definition available.

+ Details

Name:	catm_DebtInstrumentTotalNetLeverageRatioRelatedToRestrictedPaymentsCovenant
Namespace Prefix:	catm_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest Coverage Ratio

+ References

No definition available.

+ Details

Name:	catm_InterestCoverageRatio
Namespace Prefix:	catm_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Mandatory Prepayment, Changes In Exchange Rates, Revolving Credit Exposure Exceeds Total Commitments, Percentage

+ References

No definition available.

+ Details

Name:	catm_LineOfCreditFacilityMandatoryPrepaymentChangesInExchangeRatesRevolvingCreditExposureExceedsTotalCommitmentsPercentage
Namespace Prefix:	catm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Mandatory Prepayment, Consecutive Business Day Unencumbered Balance Sheet Cash Exceeds Maximum

+ References

No definition available.

+ Details

Name:	catm_LineOfCreditFacilityMandatoryPrepaymentConsecutiveBusinessDayUnencumberedBalanceSheetCashExceedsMaximum
Namespace Prefix:	catm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Mandatory Prepayment. Maximum Amount Of Unencumbered Balance Sheet Cash

+ References

No definition available.

+ Details

Name:	catm_LineOfCreditFacilityMandatoryPrepaymentMaximumAmountOfUnencumberedBalanceSheetCash
Namespace Prefix:	catm_
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

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num: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.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
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.

+ References

No definition available.

+ Details

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

- Definition

The effective interest rate at the end of the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

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

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=catm_CreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=catm_AlternativeBaseRateLoansAndCanadianPrimeRateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=catm_AdjustedLIBORateLoansCanadianDealerOfferedRateBankBillSwapReferenceRateAndJohannesburgInterbankAgreedRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Current and Long-Term Debt - Revolving Credit (Details)					3 Months Ended				9 Months Ended	36 Months Ended
Current and Long-Term Debt - Revolving Credit (Details)	Jun. 29, 2020 USD ($)	May 29, 2020	Dec. 19, 2018 USD ($)	Nov. 19, 2018	Sep. 30, 2021 USD ($)	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020 USD ($)	Sep. 30, 2021 USD ($) day	Sep. 19, 2024	Jun. 28, 2020 USD ($)	Dec. 31, 2019 USD ($)
Long-Term Debt
Write-off of unamortized deferred financing costs	$ 1,200,000		$ 1,400,000
Letters of credit outstanding								$ 10,100,000
Revolving Credit Facility
Long-Term Debt
Maximum borrowing capacity	$ 600,000,000							600,000,000			$ 750,000,000	$ 750,000,000
Letters of credit outstanding								$ 0
Weighted average interest rate												2.30%
Credit Agreement
Long-Term Debt
Mandatory prepayment for changes in exchange rates, revolving credit exposure exceeds total commitments, percentage	105.00%
Credit Agreement \| Forecast
Long-Term Debt
Mandatory prepayment, maximum amount of unencumbered balance sheet cash					$ 100,000,000				$ 100,000,000
Mandatory prepayment, consecutive business days unencumbered balance sheet cash exceeds maximum amount \| day									5
Maximum \| Revolving Credit Facility
Long-Term Debt
Total net leverage ratio, debt covenant	4.50
Maximum \| Credit Agreement
Long-Term Debt
Total net leverage ratio, debt covenant								5.25
Total net leverage ratio related to restricted payments	3.75
Maximum \| Credit Agreement \| Forecast
Long-Term Debt
Total net leverage ratio, debt covenant					5.00	5.25	5.50			4.50
Maximum \| Credit Agreement \| Alternative Base Rate Loans And Canadian Prime Rate Loans
Long-Term Debt
Margin				2.00%
Maximum \| Credit Agreement \| Adjusted LIBO Rate Loans, Canadian Dealer Offered Rate, Bank Bill Swap Reference Rate, And Johannesburg Interbank Agreed Rate
Long-Term Debt
Margin				3.00%
Minimum \| Revolving Credit Facility
Long-Term Debt
Total net leverage ratio, debt covenant		4.00
Minimum \| Credit Agreement
Long-Term Debt
Interest coverage ratio	3.00
Minimum \| Credit Agreement \| Alternative Base Rate Loans And Canadian Prime Rate Loans
Long-Term Debt
Margin				0.00%
Minimum \| Credit Agreement \| Adjusted LIBO Rate Loans, Canadian Dealer Offered Rate, Bank Bill Swap Reference Rate, And Johannesburg Interbank Agreed Rate
Long-Term Debt
Margin				1.00%