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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 |  |  |  |  |  |  | 1,000,000 cacc_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchasedIncrease
Number of shares authorized for repurchase | 324,456 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |  |  |  |  |
Common stock repurchased, shares | 2,686,744 us-gaap_StockRepurchasedDuringPeriodShares |  | 1,216,015 us-gaap_StockRepurchasedDuringPeriodShares |  | 1,740,372 us-gaap_StockRepurchasedDuringPeriodShares |  |
Common stock repurchased, value | $ 343.7 us-gaap_StockRepurchasedDuringPeriodValue |  | $ 135.2 us-gaap_StockRepurchasedDuringPeriodValue |  | $ 152.5 us-gaap_StockRepurchasedDuringPeriodValue |  |
Open Market [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Common stock repurchased, shares | 0 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = cacc_OpenMarketMember |  | 1,209,756 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = cacc_OpenMarketMember |  | 727,319 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = cacc_OpenMarketMember |  |
Common stock repurchased, value | 0 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = cacc_OpenMarketMember |  | 134.5 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = cacc_OpenMarketMember |  | 66.5 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = cacc_OpenMarketMember |  |
Tender Offer [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Common stock repurchased, shares | 2,548,868 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = cacc_TenderOfferMember |  | 0 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = cacc_TenderOfferMember |  | 1,000,000 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = cacc_TenderOfferMember |  |
Common stock repurchased, value | 325.3 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = cacc_TenderOfferMember | [1] | 0 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = cacc_TenderOfferMember |  | 84.8 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = cacc_TenderOfferMember | [1] |
Tender offer, offering costs | 0.3 cacc_StockRepurchaseProgramTenderOfferOfferingCosts / us-gaap_ShareRepurchaseProgramAxis = cacc_TenderOfferMember |  |  |  | 0.3 cacc_StockRepurchaseProgramTenderOfferOfferingCosts / us-gaap_ShareRepurchaseProgramAxis = cacc_TenderOfferMember |  |
Other [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Common stock repurchased, shares | 137,876 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = cacc_OtherStockRepurchaseProgramMember | [2] | 6,259 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = cacc_OtherStockRepurchaseProgramMember | [2] | 13,053 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = cacc_OtherStockRepurchaseProgramMember | [2] |
Common stock repurchased, value | $ 18.4 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = cacc_OtherStockRepurchaseProgramMember |  | $ 0.7 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = cacc_OtherStockRepurchaseProgramMember |  | $ 1.2 us-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.

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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