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Stock Repurchases (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 07, 2013
Equity, Class of Treasury Stock [Line Items]        
Increase in number of shares authorized for repurchase       1,000,000cacc_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchasedIncrease
Number of shares authorized for repurchase 324,456us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased      
Common stock repurchased, shares 2,686,744us-gaap_StockRepurchasedDuringPeriodShares 1,216,015us-gaap_StockRepurchasedDuringPeriodShares 1,740,372us-gaap_StockRepurchasedDuringPeriodShares  
Common stock repurchased, value $ 343.7us-gaap_StockRepurchasedDuringPeriodValue $ 135.2us-gaap_StockRepurchasedDuringPeriodValue $ 152.5us-gaap_StockRepurchasedDuringPeriodValue  
Open Market [Member]        
Equity, Class of Treasury Stock [Line Items]        
Common stock repurchased, shares 0us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_OpenMarketMember		 1,209,756us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_OpenMarketMember		 727,319us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_OpenMarketMember		  
Common stock repurchased, value 0us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_OpenMarketMember		 134.5us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_OpenMarketMember		 66.5us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_OpenMarketMember		  
Tender Offer [Member]        
Equity, Class of Treasury Stock [Line Items]        
Common stock repurchased, shares 2,548,868us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_TenderOfferMember		 0us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_TenderOfferMember		 1,000,000us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_TenderOfferMember		  
Common stock repurchased, value 325.3us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_TenderOfferMember		 [1] 0us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_TenderOfferMember		 84.8us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_TenderOfferMember		 [1]  
Tender offer, offering costs 0.3cacc_StockRepurchaseProgramTenderOfferOfferingCosts
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_TenderOfferMember		   0.3cacc_StockRepurchaseProgramTenderOfferOfferingCosts
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_TenderOfferMember		  
Other [Member]        
Equity, Class of Treasury Stock [Line Items]        
Common stock repurchased, shares 137,876us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_OtherStockRepurchaseProgramMember		 [2] 6,259us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_OtherStockRepurchaseProgramMember		 [2] 13,053us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_OtherStockRepurchaseProgramMember		 [2]  
Common stock repurchased, value $ 18.4us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_OtherStockRepurchaseProgramMember		 $ 0.7us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_OtherStockRepurchaseProgramMember		 $ 1.2us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_ShareRepurchaseProgramAxis
= cacc_OtherStockRepurchaseProgramMember		  
[1] Tender Offer Cost amounts include offering costs of $0.3 million for both 2014 and 2012.
[2] Represents shares of common stock released to us by team members as payment of tax withholdings due to us upon the vesting of restricted stock and restricted stock units.