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Loans Receivable (Summary Of Changes In Allowance For Credit Losses) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Balance, beginning of period | $ 195.4 us-gaap_LoansAndLeasesReceivableAllowance |  | $ 176.4 us-gaap_LoansAndLeasesReceivableAllowance |  | $ 154.3 us-gaap_LoansAndLeasesReceivableAllowance |
Provision for credit losses | 12.8 us-gaap_ProvisionForLoanAndLeaseLosses |  | 21.9 us-gaap_ProvisionForLoanAndLeaseLosses |  | 24.0 us-gaap_ProvisionForLoanAndLeaseLosses |
Write-offs | (3.2)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs |  | (5.3)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs |  | (4.2)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs |
Recoveries | 1.9 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts | [1] | 2.4 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts | [1] | 2.3 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts | [1]
Balance, end of period | 206.9 us-gaap_LoansAndLeasesReceivableAllowance |  | 195.4 us-gaap_LoansAndLeasesReceivableAllowance |  | 176.4 us-gaap_LoansAndLeasesReceivableAllowance |
Dealer Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Balance, beginning of period | 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 |
Provision for credit losses | 13.7 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  | 21.3 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  | 27.1 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |
Write-offs | (3.1)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  | (5.2)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |  | (3.6)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember |
Recoveries | 1.8 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember | [1] | 2.2 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember | [1] | 2.2 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_DealerLoansMember | [1]
Balance, end of period | 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 |
Purchased Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Balance, beginning of period | 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 |
Provision for credit losses | (0.9)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  | 0.6 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  | (3.1)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |
Write-offs | (0.1)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  | (0.1)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |  | (0.6)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember |
Recoveries | 0.1 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember | [1] | 0.2 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember | [1] | 0.1 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cacc_PurchasedLoansMember | [1]
Balance, end of period | $ 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 |
[1] | Represents collections received on previously written off Loans.

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 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(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References No definition available. + Details
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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 of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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