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Loans Receivable (Schedule Of Consumer Loans Forecasted Collection Percentage) (Details)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2005
Dec. 31, 2006
Dec. 31, 2007
Dec. 31, 2008
Dec. 31, 2009
Dec. 31, 2010
Dec. 31, 2011
Loans Originating In 2005 [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Forecasted Collection Percentage 73.70%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2005Member		 [1] 73.70%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2005Member		 [1] 73.60%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2005Member		 [1]              
Initial Forecasted Collection Percentage 74.00%cacc_LoansReceivableInitialForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2005Member		 [1]                  
Variance In Forecasted Collection Percentage   0.00%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2005Member		 0.10%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2005Member		              
Variance In Initial Forecasted Collection Percentage       (0.30%)cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2005Member		            
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] 69.90%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   0.00%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2006Member		 0.10%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ 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 68.00%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2007Member		 [1] 67.90%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   0.10%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2007Member		 0.00%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2007Member		              
Variance In Initial Forecasted Collection Percentage           (2.70%)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] 70.10%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   0.20%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2008Member		 0.00%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ 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] 79.20%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2009Member		 [1] 79.50%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   0.20%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2009Member		 (0.10%)cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ 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 77.20%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2010Member		 [1] 77.00%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2010Member		 [1] 77.30%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   0.20%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2010Member		 (0.10%)cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2010Member		              
Variance In Initial Forecasted Collection Percentage                 3.60%cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2010Member		  
Loans Originating In 2011 [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Forecasted Collection Percentage 74.00%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2011Member		 [1] 74.10%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2011Member		 [1] 74.10%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   (0.10%)cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2011Member		 (0.10%)cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2011Member		              
Variance In Initial Forecasted Collection Percentage                   1.50%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] 73.50%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2012Member		 [1] 72.20%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   (0.10%)cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2012Member		 1.20%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ 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 73.70%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2013Member		 [1] 73.30%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2013Member		 [1] 0.00%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   0.40%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2013Member		 0.00%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2013Member		              
Variance In Initial Forecasted Collection Percentage   1.70%cacc_LoansReceivableVarianceInInitialForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2013Member		                
LoansOriginatingIn2014 [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Forecasted Collection Percentage 72.60%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2014Member		 [1] 0.00%cacc_LoansReceivableForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2014Member		 [1] 0.00%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   0.00%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2014Member		 0.00%cacc_LoansReceivableVarianceInForecastedCollectionPercentage
/ cacc_LoansAxis
= cacc_LoansOriginatingIn2014Member		              
Variance In Initial Forecasted Collection Percentage 0.80%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.