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v2.4.1.9

Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | $ 52.8 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost | $ 53.3 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains | 0.2 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 0.1 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Losses | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | (0.2)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Estimated Fair Value | 53.0 us-gaap_AvailableForSaleSecuritiesRestricted | 53.2 us-gaap_AvailableForSaleSecuritiesRestricted
US Government and Agency Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 21.8 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 28.8 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Gross Unrealized Gains | 0.2 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 0.1 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Gross Unrealized Losses | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | (0.1)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Estimated Fair Value | 22.0 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 28.8 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Corporate Bond Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 21.0 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CorporateBondSecuritiesMember | 19.1 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CorporateBondSecuritiesMember
Gross Unrealized Gains | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CorporateBondSecuritiesMember | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CorporateBondSecuritiesMember
Gross Unrealized Losses | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CorporateBondSecuritiesMember | (0.1)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CorporateBondSecuritiesMember
Estimated Fair Value | 21.0 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CorporateBondSecuritiesMember | 19.0 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CorporateBondSecuritiesMember
Asset-backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 6.2 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember | 4.8 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember
Gross Unrealized Gains | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember
Gross Unrealized Losses | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember |
Estimated Fair Value | 6.2 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember | 4.8 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember
Collateralized Mortgage Backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 3.8 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_MortgageBackedSecuritiesMember | 0.6 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_MortgageBackedSecuritiesMember
Gross Unrealized Gains | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_MortgageBackedSecuritiesMember | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_MortgageBackedSecuritiesMember
Gross Unrealized Losses | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_MortgageBackedSecuritiesMember | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_MortgageBackedSecuritiesMember
Estimated Fair Value | $ 3.8 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_MortgageBackedSecuritiesMember | $ 0.6 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_MortgageBackedSecuritiesMember

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition The carrying amount of securities categorized neither as held-to-maturity nor trading which serve as security for borrowings or other arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5086-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.4-08(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph b -Article 4 + Details
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