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Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |  |
New Consumer Loan assignments |  | $ 2,414.8 | $ 1,968.3 | $ 1,881.3
Accelerated Dealer Holdback payments |  | 52.6 | 47.1 | 53.6
Dealer Holdback payments |  | $ 128.9 | $ 131.6 | 142.0
Affiliated Dealer Activity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Dealer Loan revenue |  |  |  | $ 1.5
Dealer Loan revenue, percentage |  |  |  | 0.20%
New Consumer Loan assignments | [1] |  |  | $ 8.9
New Consumer Loan assignments, percentage |  |  |  | 0.30%
Accelerated Dealer Holdback payments |  |  |  | $ 0.2
Accelerated Dealer Holdback payments, percentage |  |  |  | 0.40%
Dealer Holdback payments |  |  |  | $ 1.0
Dealer Holdback payments, percentage |  |  |  | 0.70%
[1] | Represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program and one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program.

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- Definition The cash outflow for payments made to dealers under our Portfolio Program at the time a pool of 100 or more consumer loans is closed by dealers with a single open pool or at the time 100 consumer loans have been collectively assigned by dealers with multiple open pools. + References No definition available. + Details
Name: | cacc_AcceleratedPaymentsOfDealerHoldback
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash outflow for non-recourse payments made to dealers under a portfolio program in exchange for the right to service the underlying consumer loans. + References No definition available. + Details
Name: | cacc_AdvancesToDealers
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash outflow for payments made to dealers under our Portfolio Program from the portion of the collections on the underlying consumer loans that exceed amounts retained by us to recover the advance balance, certain collection costs, and our servicing fee. + References No definition available. + Details
Name: | cacc_PaymentsOfDealerHoldback
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Percentage Of Accelerated Payments Of Dealer Holdback + References No definition available. + Details
Name: | cacc_PercentageOfAcceleratedPaymentsOfDealerHoldback
Namespace Prefix: | cacc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Advances To Dealers + References No definition available. + Details
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Namespace Prefix: | cacc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Payments Of Dealer Holdback + References No definition available. + Details
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Namespace Prefix: | cacc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Related Party Transaction Revenues From Transaction + References No definition available. + Details
Name: | cacc_PercentageOfRelatedPartyTransactionRevenuesFromTransaction
Namespace Prefix: | cacc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Details
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