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Loans Receivable (Summary Of Changes In Accretable Yield) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Balance, beginning of period | $ 780.3 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield |  | $ 718.1 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield |  | $ 628.1 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield |
New Consumer Loan assignments | 671.0 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldAdditions | [1] | 615.2 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldAdditions | [1] | 586.5 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldAdditions | [1]
Finance charge income | (630.4)us-gaap_FinancialServicesRevenue |  | (590.4)us-gaap_FinancialServicesRevenue |  | (538.2)us-gaap_FinancialServicesRevenue |
Forecast changes | 35.8 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldReclassificationsFromNonaccretableDifference |  | 32.5 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldReclassificationsFromNonaccretableDifference |  | 35.6 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldReclassificationsFromNonaccretableDifference |
Transfers | 5.0 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldTransfers | [2] | 4.9 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldTransfers | [2] | 6.1 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldTransfers | [2]
Balance, end of period | 861.7 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield |  | 780.3 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield |  | 718.1 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield |
Dealer Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Balance, beginning of period | 667.5 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  | 602.9 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  | 508.0 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |
New Consumer Loan assignments | 593.8 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldAdditions / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember | [1] | 564.9 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldAdditions / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember | [1] | 538.7 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldAdditions / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember | [1]
Finance charge income | (552.8)us-gaap_FinancialServicesRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  | (517.7)us-gaap_FinancialServicesRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  | (458.7)us-gaap_FinancialServicesRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |
Forecast changes | 23.1 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldReclassificationsFromNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  | 24.9 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldReclassificationsFromNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  | 25.6 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldReclassificationsFromNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |
Transfers | (6.4)cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldTransfers / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember | [2] | (7.5)cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldTransfers / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember | [2] | (10.7)cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldTransfers / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember | [2]
Balance, end of period | 725.2 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  | 667.5 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  | 602.9 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |
Purchased Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Balance, beginning of period | 112.8 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  | 115.2 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  | 120.1 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |
New Consumer Loan assignments | 77.2 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldAdditions / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember | [1] | 50.3 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldAdditions / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember | [1] | 47.8 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldAdditions / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember | [1]
Finance charge income | (77.6)us-gaap_FinancialServicesRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  | (72.7)us-gaap_FinancialServicesRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  | (79.5)us-gaap_FinancialServicesRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |
Forecast changes | 12.7 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldReclassificationsFromNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  | 7.6 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldReclassificationsFromNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  | 10.0 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldReclassificationsFromNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |
Transfers | 11.4 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldTransfers / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember | [2] | 12.4 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldTransfers / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember | [2] | 16.8 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldTransfers / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember | [2]
Balance, end of period | $ 136.5 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  | $ 112.8 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  | $ 115.2 cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |
[1] | The Dealer Loans amount represents the net cash flows expected at the time of assignment on Consumer Loans assigned under our Portfolio Program, less the related advances paid to Dealers. The Purchased Loans amount represents the net cash flows expected at the time of assignment on Consumer Loans assigned under our Purchase Program, less the related one-time payments made to Dealers.
[2] | Under our Portfolio Program, certain events may result in Dealers forfeiting their rights to Dealer Holdback. We transfer the Dealer’s outstanding Dealer Loan balance and related expected future net cash flows to Purchased Loans in the period this forfeiture occurs.

X
- Definition The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
Name: | cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYield
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Increases in the aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan due to the acquisition of similar loans during the period. This relates to loans with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Change in the estimate of cash flows expected to be collected, after acquisition of a loan, which results in an increase in accretable yield (for example, if actual cash flows are significantly greater than previously expected). This relates to loans with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
Name: | cacc_CertainLoansAcquiredInTransferAccountedForAsLoansAccretableYieldReclassificationsFromNonaccretableDifference
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Certain Loans Acquired In Transfer Accounted For As Loans Accretable Yield Transfers + References No definition available. + Details
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Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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- Definition The aggregate financial services revenue and operating interest income earned during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |