XML 14 R48.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Loans Receivable (Schedule of Consumer Loans Forecasted Collection Percentage) (Details) | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Dec. 31, 2007 | Dec. 31, 2006
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Loans Originating In 2006 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | [1] | 70.10% | 70.10% | 70.00% |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | [1] | 71.40% |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  |  | 0.10% |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  |  |  |  |  |  |  | (1.30%)
Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended |  |  | 0.00% |  |  |  |  |  |  |  |  |
Loans Originating In 2007 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | [1] | 68.10% | 68.10% | 68.00% |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | [1] | 70.70% |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  |  | 0.10% |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  |  |  |  |  |  | (2.60%) |
Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended |  |  | 0.00% |  |  |  |  |  |  |  |  |
Loans Originating In 2008 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | [1] | 70.30% | 70.30% | 70.30% |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | [1] | 69.70% |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  |  | 0.00% |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  |  |  |  |  | 0.60% |  |
Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended |  |  | 0.00% |  |  |  |  |  |  |  |  |
Loans Originating In 2009 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | [1] | 79.40% | 79.40% | 79.40% |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | [1] | 71.90% |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  |  | 0.00% |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  |  |  |  | 7.50% |  |  |
Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended |  |  | 0.00% |  |  |  |  |  |  |  |  |
Loans Originating In 2010 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | [1] | 77.40% | 77.40% | 77.20% |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | [1] | 73.60% |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  |  | 0.20% |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  |  |  | 3.80% |  |  |  |
Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended |  |  | 0.00% |  |  |  |  |  |  |  |  |
Loans Originating In 2011 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | [1] | 74.20% | 74.20% | 74.00% |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | [1] | 72.50% |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  |  | 0.20% |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  |  | 1.70% |  |  |  |  |
Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended |  |  | 0.00% |  |  |  |  |  |  |  |  |
Loans Originating In 2012 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | [1] | 73.20% | 73.30% | 73.40% |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | [1] | 71.40% |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  |  | (0.20%) |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  | 1.80% |  |  |  |  |  |
Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended |  |  | (0.10%) |  |  |  |  |  |  |  |  |
Loans Originating In 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | [1] | 73.50% | 73.50% | 73.70% |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | [1] | 72.00% |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  |  | (0.20%) |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  | 1.50% |  |  |  |  |  |  |  |
Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended |  |  | 0.00% |  |  |  |  |  |  |  |  |
Loans Originating In 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | [1] | 72.80% | 72.80% | 72.60% |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | [1] | 71.80% |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  |  | 0.20% |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  | 1.00% |  |  |  |  |  |  |
Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended |  |  | 0.00% |  |  |  |  |  |  |  |  |
Loans Originating In 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | [1] | 68.20% | 68.90% | 0.00% |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | [1] | 68.10% |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  |  | 0.00% |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  | 0.10% |  |  |  |  |  |  |
Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended |  |  | (0.70%) |  |  |  |  |  |  |  |  |
Loans Originating In 2015 Current Quarter [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage |  | 66.50% |  |  |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage |  | 0.00% |  |  |  |  |  |  |  |  |  |
Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended |  |  |  |  |  |  |  |  |  |  |  |
Loans Originating In 2015 Prior Quarters [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage |  | 69.00% | 68.90% |  |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage |  | 68.60% |  |  |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  | 0.40% |  |  |  |  |  |  |  |  |
Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended |  |  | 0.10% |  |  |  |  |  |  |  |  |
[1] | Represents the total forecasted collections we expect to collect on the Consumer Loans as a percentage of the repayments that we were contractually owed on the Consumer Loans at the time of assignment. Contractual repayments include both principal and interest.

X
- Definition Loans Receivable Forecasted Collection Percentage + References No definition available. + Details
Name: | cacc_LoansReceivableForecastedCollectionPercentage
Namespace Prefix: | cacc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans Receivable Initial Forecasted Collection Percentage + References No definition available. + Details
Name: | cacc_LoansReceivableInitialForecastedCollectionPercentage
Namespace Prefix: | cacc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter Ended + References No definition available. + Details
Name: | cacc_LoansReceivableVarianceInForecastedCollectionPercentageFromPriorQuarterEnded
Namespace Prefix: | cacc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans Receivable Variance In Forecasted Collection Percentage From Prior Year Ended + References No definition available. + Details
Name: | cacc_LoansReceivableVarianceInForecastedCollectionPercentageFromPriorYearEnded
Namespace Prefix: | cacc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans Receivable Variance In Initial Forecasted Collection Percentage + References No definition available. + Details
Name: | cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage
Namespace Prefix: | cacc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | cacc_LoansAxis=cacc_LoansOriginatingIn2006Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_LoansAxis=cacc_LoansOriginatingIn2007Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_LoansAxis=cacc_LoansOriginatingIn2008Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_LoansAxis=cacc_LoansOriginatingIn2009Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_LoansAxis=cacc_LoansOriginatingIn2010Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_LoansAxis=cacc_LoansOriginatingIn2011Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_LoansAxis=cacc_LoansOriginatingIn2012Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_LoansAxis=cacc_LoansOriginatingIn2013Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_LoansAxis=cacc_LoansOriginatingIn2014Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_LoansAxis=cacc_LoansOriginatingin2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_LoansAxis=cacc_LoansOriginatingin2015CurrentQuarterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_LoansAxis=cacc_LoansOriginatingIn2015PriorQuartersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |