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Loans Receivable (Schedule of Consumer Loans Forecasted Collection Percentage) (Details) | Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2006 | Dec. 31, 2007 | Dec. 31, 2008 | Dec. 31, 2009 | Dec. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2012 | Jun. 30, 2014
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Loans Originating In 2006 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | 70.00%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2006Member | [1] | 70.00%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2006Member | [1] |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | 71.40%cacc_LoansReceivableInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2006Member | [1] |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  | 0.00%cacc_LoansReceivableVarianceInForecastedCollectionPercentageFromPriorYearEnded / cacc_LoansAxis = cacc_LoansOriginatingIn2006Member |  |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  | (1.40%)cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2006Member |  |  |  |  |  |  |
Loans Originating In 2007 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | 68.10%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2007Member | [1] | 68.00%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2007Member | [1] |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | 70.70%cacc_LoansReceivableInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2007Member | [1] |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  | 0.10%cacc_LoansReceivableVarianceInForecastedCollectionPercentageFromPriorYearEnded / cacc_LoansAxis = cacc_LoansOriginatingIn2007Member |  |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  | (2.60%)cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2007Member |  |  |  |  |  |
Loans Originating In 2008 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | 70.30%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2008Member | [1] | 70.30%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2008Member | [1] |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | 69.70%cacc_LoansReceivableInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2008Member | [1] |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  | 0.00%cacc_LoansReceivableVarianceInForecastedCollectionPercentageFromPriorYearEnded / cacc_LoansAxis = cacc_LoansOriginatingIn2008Member |  |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  |  | 0.60%cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2008Member |  |  |  |  |
Loans Originating In 2009 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | 79.40%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2009Member | [1] | 79.40%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2009Member | [1] |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | 71.90%cacc_LoansReceivableInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2009Member | [1] |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  | 0.00%cacc_LoansReceivableVarianceInForecastedCollectionPercentageFromPriorYearEnded / cacc_LoansAxis = cacc_LoansOriginatingIn2009Member |  |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  |  |  | 7.50%cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2009Member |  |  |  |
Loans Originating In 2010 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | 77.30%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2010Member | [1] | 77.20%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2010Member | [1] |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | 73.60%cacc_LoansReceivableInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2010Member | [1] |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  | 0.10%cacc_LoansReceivableVarianceInForecastedCollectionPercentageFromPriorYearEnded / cacc_LoansAxis = cacc_LoansOriginatingIn2010Member |  |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  |  |  |  | 3.70%cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2010Member |  |  |
Loans Originating In 2011 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | 74.20%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2011Member | [1] | 74.00%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2011Member | [1] |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | 72.50%cacc_LoansReceivableInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2011Member | [1] |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  | 0.20%cacc_LoansReceivableVarianceInForecastedCollectionPercentageFromPriorYearEnded / cacc_LoansAxis = cacc_LoansOriginatingIn2011Member |  |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  |  |  |  |  | 1.70%cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2011Member |  |
Loans Originating In 2012 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | 73.40%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2012Member | [1] | 73.40%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2012Member | [1] |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | 71.40%cacc_LoansReceivableInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2012Member | [1] |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  | 0.00%cacc_LoansReceivableVarianceInForecastedCollectionPercentageFromPriorYearEnded / cacc_LoansAxis = cacc_LoansOriginatingIn2012Member |  |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  |  |  |  |  |  | 2.00%cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2012Member |
Loans Originating In 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | 73.60%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2013Member | [1] | 73.70%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2013Member | [1] |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | 72.00%cacc_LoansReceivableInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2013Member | [1] |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  | (0.10%)cacc_LoansReceivableVarianceInForecastedCollectionPercentageFromPriorYearEnded / cacc_LoansAxis = cacc_LoansOriginatingIn2013Member |  |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  | 1.60%cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2013Member |  |  |  |  |  |  |  |  |
Loans Originating In 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forecasted Collection Percentage | 72.80%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2014Member | [1] | 72.60%cacc_LoansReceivableForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2014Member | [1] |  |  |  |  |  |  |  |
Initial Forecasted Collection Percentage | 71.80%cacc_LoansReceivableInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2014Member | [1] |  |  |  |  |  |  |  |  |  |
Variance In Forecasted Collection Percentage from December 31, 2014 |  |  | 0.20%cacc_LoansReceivableVarianceInForecastedCollectionPercentageFromPriorYearEnded / cacc_LoansAxis = cacc_LoansOriginatingIn2014Member |  |  |  |  |  |  |  |  |
Variance In Initial Forecasted Collection Percentage |  |  |  |  |  |  |  |  |  |  |  | 1.00%cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage / cacc_LoansAxis = cacc_LoansOriginatingIn2014Member
[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.

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- Definition Loans Receivable Variance In Forecasted Collection Percentage From Prior Year Ended + References No definition available. + Details
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