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Debt (Narrative) (Details) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Feb. 21, 2014
Jan. 22, 2014
Mar. 30, 2015
Dec. 31, 2014
Sep. 15, 2014
Debt Instrument [Line Items]              
Maximum hedging reserve $ 1,000,000cacc_MaximumHedgingReserve            
Percentage of collections on contributed loans 6.00%cacc_PercentageOfCollectionsOnContributedLoans            
Monthly servicing fee per financing 6.00%cacc_MonthlyServicingFeePerFinancing            
Repayment of senior notes 0us-gaap_RepaymentsOfSeniorDebt 350,000,000us-gaap_RepaymentsOfSeniorDebt          
Proceeds from issuance of senior notes 248,200,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt 300,000,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt          
Loss on extinguishment of debt 0us-gaap_GainsLossesOnExtinguishmentOfDebt 21,800,000us-gaap_GainsLossesOnExtinguishmentOfDebt          
Debt covenants 1cacc_DebtInstrumentCovenantNetIncomeForPastTwoQuarters            
Revolving Secured Line of Credit [Member]              
Debt Instrument [Line Items]              
Line of credit facility 235,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember		            
Percentage of net book value of loans 0.00%cacc_PercentageOfNetBookValueOfLoans
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember		            
Wholly-owned Subsidiary n/a            
Warehouse Facilities [Member]              
Debt Instrument [Line Items]              
Percentage of net book value of loans 80.00%cacc_PercentageOfNetBookValueOfLoans
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilitiesMember		            
Number of warehouse facilities 3cacc_NumberWarehouseFacilities
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilitiesMember		            
Debt facility financing amount 475,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilitiesMember		            
Warehouse Facility II [Member]              
Debt Instrument [Line Items]              
Debt facility financing amount 325,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember		 [1],[2]            
Wholly-owned Subsidiary CAC Warehouse Funding Corp. II [1]            
Debt maturity date Jul. 18, 2017 [1],[3]            
Senior notes yield to maturity 2.17%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember		         2.16%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember		  
Warehouse Facility IV [Member]              
Debt Instrument [Line Items]              
Debt facility financing amount 75,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember		 [1],[2]            
Wholly-owned Subsidiary CAC Warehouse Funding LLC IV [1]            
Debt maturity date Apr. 05, 2016 [1],[3]            
Senior notes yield to maturity 2.18%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember		         2.17%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember		  
Warehouse Facility IV And V [Member]              
Debt Instrument [Line Items]              
Debt facility financing amount 75,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityFourAndFiveMember		           75,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityFourAndFiveMember
2017 Senior Notes [Member]              
Debt Instrument [Line Items]              
Senior notes stated interest rate 9.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandSeventeenSeniorNotesMember		            
Repayment of senior notes     350,000,000us-gaap_RepaymentsOfSeniorDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandSeventeenSeniorNotesMember		        
Loss on extinguishment of debt     (21,800,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandSeventeenSeniorNotesMember		        
2021 Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt facility financing amount 300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember		     300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember		      
Wholly-owned Subsidiary n/a            
Close date, secured financings       Jan. 22, 2014      
Senior notes stated interest rate       6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember		      
Debt maturity date Feb. 15, 2021     Feb. 15, 2021      
Senior notes yield to maturity 6.125%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember		         6.125%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember		  
2023 Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt facility financing amount 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember		       250,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember		    
Wholly-owned Subsidiary n/a            
Close date, secured financings         Mar. 30, 2015    
Senior notes stated interest rate         7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember		    
Debt maturity date Mar. 15, 2023       Mar. 15, 2023    
Redemption price, percentage of principal amount redeemed         99.266%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember		    
Proceeds from issuance of senior notes         248,200,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember		    
Senior notes yield to maturity 7.375%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember		       7.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember		 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember		  
Unamortized debt discount 1,800,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember		            
Term ABS 2012-1 [Member]              
Debt Instrument [Line Items]              
Senior notes yield to maturity 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember		         3.04%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember		  
Term ABS 2012-2 [Member]              
Debt Instrument [Line Items]              
Debt facility financing amount 252,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember		 [1]            
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2012-2 [1]            
Debt financing close date Sep. 20, 2012            
Debt maturity date Sep. 15, 2014 [1],[3]            
Senior notes yield to maturity 1.76%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember		         1.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember		  
Term ABS 2013-1 [Member]              
Debt Instrument [Line Items]              
Debt facility financing amount 140,300,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember		 [1]            
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2013-1 [1]            
Debt financing close date Apr. 25, 2013            
Debt maturity date Apr. 15, 2015 [1],[3]            
Senior notes yield to maturity 1.31%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember		         1.31%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember		  
Term ABS 2013-2 [Member]              
Debt Instrument [Line Items]              
Debt facility financing amount 197,800,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredfinancingsTwoThousandThirteenTwoMember		 [1]            
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2013-2 [1]            
Debt financing close date Oct. 31, 2013            
Debt maturity date Oct. 15, 2015 [1],[3]            
Senior notes yield to maturity 1.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredfinancingsTwoThousandThirteenTwoMember		         1.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredfinancingsTwoThousandThirteenTwoMember		  
Term ABS 2014-1 [Member]              
Debt Instrument [Line Items]              
Debt facility financing amount 299,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember		 [1]            
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2014-1 [1]            
Debt financing close date Apr. 16, 2014            
Debt maturity date Apr. 15, 2016 [1],[3]            
Senior notes yield to maturity 1.72%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember		         1.72%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember		  
Term ABS 2014-2 [Member]              
Debt Instrument [Line Items]              
Debt facility financing amount 349,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember		 [1]            
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2014-2 [1]            
Debt financing close date Sep. 25, 2014            
Debt maturity date Sep. 15, 2016 [1],[3]            
Senior notes yield to maturity 2.05%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember		         2.05%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember		  
Term ABS 2015-1 [Member]              
Debt Instrument [Line Items]              
Debt facility financing amount $ 300,600,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFifteenOneMember		 [1]            
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2015-1 [1]            
Debt financing close date Jan. 29, 2015            
Debt maturity date Jan. 16, 2017 [1],[3]            
Senior notes yield to maturity 2.26%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFifteenOneMember		            
[1] Financing made available only to a specified subsidiary of the Company.
[2] Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[3] Represents the revolving maturity date. The outstanding balance will amortize after the maturity date based on the cash flows of the pledged assets.