XML 14 R24.htm IDEA: XBRL DOCUMENT
v3.19.3

Description of Business (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2019
Description Of Business [Abstract] |
Percentage of Consumer Loans Assigned with FICO Score of Less Than 650 or No FICO Score | The following table shows the percentage of Consumer Loans assigned to us with either FICO® scores below 650 or no FICO® scores:
|  | For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
Consumer Loan Assignment Volume |  | 2019 |  | 2018 |  | 2019 |  | 2018
Percentage of total unit volume with either FICO® scores below 650 or no FICO® scores |  | 95.5 | % |  | 95.2 | % |  | 96.0 | % |  | 95.7 | %
Schedule of Percentage of Consumer Loans Assigned Based on Unit Volumes | The following table shows the percentage of Consumer Loans assigned to us as Dealer Loans and Purchased Loans for each of the last seven quarters:
|  | Unit Volume |  | Dollar Volume (1)
Three Months Ended |  | Dealer Loans |  | Purchased Loans |  | Dealer Loans |  | Purchased Loans
March 31, 2018 |  | 70.1 | % |  | 29.9 | % |  | 67.4 | % |  | 32.6 | %
June 30, 2018 |  | 69.7 | % |  | 30.3 | % |  | 66.8 | % |  | 33.2 | %
September 30, 2018 |  | 69.5 | % |  | 30.5 | % |  | 67.0 | % |  | 33.0 | %
December 31, 2018 |  | 69.4 | % |  | 30.6 | % |  | 67.4 | % |  | 32.6 | %
March 31, 2019 |  | 67.4 | % |  | 32.6 | % |  | 65.0 | % |  | 35.0 | %
June 30, 2019 |  | 66.7 | % |  | 33.3 | % |  | 63.7 | % |  | 36.3 | %
September 30, 2019 |  | 67.2 | % |  | 32.8 | % |  | 64.1 | % |  | 35.9 | %
(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. Payments of Dealer Holdback (as defined below) and accelerated Dealer Holdback are not included.

X
- Definition Description Of Business [Abstract] + References No definition available. + Details
Name: | cacc_DescriptionOfBusinessAbstract
Namespace Prefix: | cacc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Percentage Of Consumer Loans Assigned Based On Unit Volumes Table Text Block + References No definition available. + Details
Name: | cacc_ScheduleOfPercentageOfConsumerLoansAssignedBasedOnUnitVolumesTableTextBlock
Namespace Prefix: | cacc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953659-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 55 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=82894031&loc=SL6953803-111525 + Details
Name: | us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration