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Debt (Schedule of General Information of Financing Transaction) (Details) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Jan. 22, 2014
Mar. 30, 2015
Revolving Secured Line of Credit [Member]      
Debt Instrument [Line Items]      
Wholly-owned Subsidiary n/a    
Line of credit maturity date Jun. 23, 2017    
Financing Amount $ 235,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember		    
Revolving Secured Line of Credit [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		    
Revolving Secured Line of Credit [Member] | Prime Rate [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember		    
Warehouse Facility II [Member]      
Debt Instrument [Line Items]      
Wholly-owned Subsidiary CAC Warehouse Funding Corp. II [1]    
Debt maturity date Jul. 18, 2017 [1],[2]    
Debt facility financing amount 325,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember		 [1],[3]    
Warehouse Facility II [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		 [1],[2]    
Warehouse Facility IV [Member]      
Debt Instrument [Line Items]      
Wholly-owned Subsidiary CAC Warehouse Funding LLC IV [1]    
Debt maturity date Apr. 05, 2016 [1],[2]    
Debt facility financing amount 75,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember		 [1],[3]    
Warehouse Facility IV [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		 [1],[2]    
Warehouse Facility V [Member]      
Debt Instrument [Line Items]      
Wholly-owned Subsidiary CAC Warehouse Funding LLC V [1]    
Debt maturity date Sep. 10, 2017 [1],[4]    
Debt facility financing amount 75,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember		 [1],[3]    
Warehouse Facility V [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		 [1],[2]    
Term ABS 2012-2 [Member]      
Debt Instrument [Line Items]      
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2012-2 [1]    
Debt maturity date Sep. 15, 2014 [1],[2]    
Debt facility financing amount 252,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember		 [1]    
Term ABS 2013-1 [Member]      
Debt Instrument [Line Items]      
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2013-1 [1]    
Debt maturity date Apr. 15, 2015 [1],[2]    
Debt facility financing amount 140,300,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember		 [1]    
Term ABS 2013-2 [Member]      
Debt Instrument [Line Items]      
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2013-2 [1]    
Debt maturity date Oct. 15, 2015 [1],[2]    
Debt facility financing amount 197,800,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredfinancingsTwoThousandThirteenTwoMember		 [1]    
Term ABS 2014-1 [Member]      
Debt Instrument [Line Items]      
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2014-1 [1]    
Debt maturity date Apr. 15, 2016 [1],[2]    
Debt facility financing amount 299,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember		 [1]    
Term ABS 2014-2 [Member]      
Debt Instrument [Line Items]      
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2014-2 [1]    
Debt maturity date Sep. 15, 2016 [1],[2]    
Debt facility financing amount 349,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember		 [1]    
Term ABS 2015-1 [Member]      
Debt Instrument [Line Items]      
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2015-1 [1]    
Debt maturity date Jan. 16, 2017 [1],[2]    
Debt facility financing amount 300,600,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFifteenOneMember		 [1]    
2021 Senior Notes [Member]      
Debt Instrument [Line Items]      
Wholly-owned Subsidiary n/a    
Debt maturity date Feb. 15, 2021 Feb. 15, 2021  
Debt facility financing amount 300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember		 300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember		  
2023 Senior Notes [Member]      
Debt Instrument [Line Items]      
Wholly-owned Subsidiary n/a    
Debt maturity date Mar. 15, 2023   Mar. 15, 2023
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
[1] Financing made available only to a specified subsidiary of the Company.
[2] Represents the revolving maturity date. The outstanding balance will amortize after the maturity date based on the cash flows of the pledged assets.
[3] Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[4] Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on September 10, 2019 will be due.