XML 81 R66.htm IDEA: XBRL DOCUMENT
v3.20.4

Reinsurance (Cumulative Incurred Claims) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 142,300,000 |  |  |  |
Claims Reserve | $ 2,300,000 |  |  |  |
Cumulative Number Of Reported Claims | 119,801 |  |  |  |
Incident Year 2016 [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 26,000,000.0 | $ 26,000,000.0 | $ 26,000,000.0 | $ 26,000,000.0 | $ 25,700,000
Claims Reserve | $ 0 |  |  |  |
Cumulative Number Of Reported Claims | 25,215 |  |  |  |
Incident Year 2017 [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 22,600,000 | 22,600,000 | 22,500,000 | $ 22,300,000 |
Claims Reserve | $ 0 |  |  |  |
Cumulative Number Of Reported Claims | 20,462 |  |  |  |
Incident Year 2018 [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 25,800,000 | 25,700,000 | $ 25,800,000 |  |
Claims Reserve | $ 0 |  |  |  |
Cumulative Number Of Reported Claims | 22,309 |  |  |  |
Incident Year 2019 [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 30,200,000 | $ 30,100,000 |  |  |
Claims Reserve | $ 0 |  |  |  |
Cumulative Number Of Reported Claims | 24,411 |  |  |  |
Incident Year 2020 [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 37,700,000 |  |  |  |
Claims Reserve | $ 2,300,000 |  |  |  |
Cumulative Number Of Reported Claims | 27,404 |  |  |  |

X
- 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
Name: | us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -URI http://asc.fasb.org/extlink&oid=27015833&loc=d3e570705-122907 + Details
Name: | us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Costs of settling insured claims and costs incurred in the claims settlement process for the specified year specifically for claims that have already been submitted to the insurance company for reimbursement. + References No definition available. + Details
Name: | us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedClaimsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | cacc_IncidentYearAxis=cacc_IncidentYear2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_IncidentYearAxis=cacc_IncidentYear2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_IncidentYearAxis=cacc_IncidentYear2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_IncidentYearAxis=cacc_IncidentYear2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_IncidentYearAxis=cacc_IncidentYear2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |