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Loans Receivable (Schedule Of Loans Receivable) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans receivable | $ 2,719.8 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome |  |  |  | $ 2,408.2 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome |  |  |  | $ 2,109.9 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | $ 1,752.9 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Allowance for credit losses | (206.9)us-gaap_LoansAndLeasesReceivableAllowance |  |  |  | (195.4)us-gaap_LoansAndLeasesReceivableAllowance |  |  |  | (176.4)us-gaap_LoansAndLeasesReceivableAllowance | (154.3)us-gaap_LoansAndLeasesReceivableAllowance
Loans receivable, net | 2,512.9 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 2,407.4 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 2,358.0 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 2,318.0 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 2,212.8 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 2,163.4 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 2,092.7 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 2,028.6 us-gaap_LoansAndLeasesReceivableNetReportedAmount |  |
Dealer Loans [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans receivable | 2,389.8 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  |  |  | 2,155.5 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  |  |  | 1,869.4 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember | 1,506.5 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember
Allowance for credit losses | (198.1)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  |  |  | (185.7)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  |  |  | (167.4)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember | (141.7)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember
Loans receivable, net | 2,191.7 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  |  |  | 1,969.8 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  |  |  |  |
Purchased Loans [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans receivable | 330.0 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  |  |  | 252.7 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  |  |  | 240.5 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember | 246.4 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember
Allowance for credit losses | (8.8)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  |  |  | (9.7)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  |  |  | (9.0)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember | (12.6)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember
Loans receivable, net | $ 321.2 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  |  |  | $ 243.0 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  |  |  |  |

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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