XML 59 R72.htm IDEA: XBRL DOCUMENT v2.4.1.9

Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Related Party Transaction [Line Items]
Affiliated Dealer Loan balances	$ 8.7us-gaap_DueFromAffiliates		$ 7.5us-gaap_DueFromAffiliates
Percentage of Affiliated Dealer Loan balances	0.40%cacc_PercentageOfDueFromAffiliates		0.30%cacc_PercentageOfDueFromAffiliates
New Consumer Loan assignments	1,471.4cacc_AdvancesToDealers		1,356.6cacc_AdvancesToDealers		1,253.6cacc_AdvancesToDealers
Accelerated Dealer Holdback payments	41.7cacc_AcceleratedPaymentsOfDealerHoldback		40.4cacc_AcceleratedPaymentsOfDealerHoldback		43.7cacc_AcceleratedPaymentsOfDealerHoldback
Dealer Holdback payments	135.5cacc_PaymentsOfDealerHoldback		114.2cacc_PaymentsOfDealerHoldback		115.7cacc_PaymentsOfDealerHoldback
Affiliated Dealer Activity [Member]
Related Party Transaction [Line Items]
Dealer Loan revenue	1.6us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		1.5us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		1.2us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Dealer Loan revenue, percentage	0.30%cacc_PercentageOfRelatedPartyTransactionRevenuesFromTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		0.30%cacc_PercentageOfRelatedPartyTransactionRevenuesFromTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		0.30%cacc_PercentageOfRelatedPartyTransactionRevenuesFromTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
New Consumer Loan assignments	4.2cacc_AdvancesToDealers / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember	[1]	4.3cacc_AdvancesToDealers / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember	[1]	3.6cacc_AdvancesToDealers / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember	[1]
New Consumer Loan assignments, percentage	0.30%cacc_PercentageOfAdvancesToDealers / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		0.30%cacc_PercentageOfAdvancesToDealers / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		0.30%cacc_PercentageOfAdvancesToDealers / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Accelerated Dealer Holdback payments	0.1cacc_AcceleratedPaymentsOfDealerHoldback / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		0.1cacc_AcceleratedPaymentsOfDealerHoldback / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		0.1cacc_AcceleratedPaymentsOfDealerHoldback / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Accelerated Dealer Holdback payments, percentage	0.20%cacc_PercentageOfAcceleratedPaymentsOfDealerHoldback / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		0.20%cacc_PercentageOfAcceleratedPaymentsOfDealerHoldback / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		0.20%cacc_PercentageOfAcceleratedPaymentsOfDealerHoldback / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Dealer Holdback payments	$ 1.4cacc_PaymentsOfDealerHoldback / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		$ 2.2cacc_PaymentsOfDealerHoldback / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		$ 3.2cacc_PaymentsOfDealerHoldback / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Dealer Holdback payments, percentage	1.00%cacc_PercentageOfPaymentsOfDealerHoldback / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		1.90%cacc_PercentageOfPaymentsOfDealerHoldback / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember		2.80%cacc_PercentageOfPaymentsOfDealerHoldback / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
[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.

X

- 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

X

- 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

X

- 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

X

- 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

X

- Definition

Percentage Of Advances To Dealers

+ References

No definition available.

+ Details

Name:	cacc_PercentageOfAdvancesToDealers
Namespace Prefix:	cacc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage Of Due From Affiliates

+ References

No definition available.

+ Details

Name:	cacc_PercentageOfDueFromAffiliates
Namespace Prefix:	cacc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage Of Payments Of Dealer Holdback

+ References

No definition available.

+ Details

Name:	cacc_PercentageOfPaymentsOfDealerHoldback
Namespace Prefix:	cacc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Definition

For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(k)(1))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph k

-Subparagraph 1

-Article 4



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Article 7



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.3)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_DueFromAffiliates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Related Parties

-URI http://asc.fasb.org/extlink&oid=16382449



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-07.1(c))

-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 07

-Paragraph b

-Subparagraph 1

-Article 6

+ Details

Name:	us-gaap_RevenueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: