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Debt (Schedule of General Information of Financing Transaction) (Details) - USD ($)

3 Months Ended

Mar. 30, 2015

Jan. 22, 2014

Mar. 31, 2017

Dec. 31, 2016

Debt Instrument [Line Items]

Debt facility financing amount

$ 2,924,200,000

$ 2,622,100,000

Revolving Secured Line of Credit [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

n/a

Line of credit maturity date

Jun. 22, 2019

Financing Amount

$ 310,000,000

Debt facility financing amount

^[1]

$ 134,100,000

Revolving Secured Line of Credit [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Basis spread on variable rate

1.875%

Revolving Secured Line of Credit [Member] | Prime Rate [Member]

Debt Instrument [Line Items]

Basis spread on variable rate

0.875%

Warehouse Facility II [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

^[2]

CAC Warehouse Funding Corp. II

Debt maturity date

^[2],[3]

Jun. 23, 2019

Debt facility financing amount

^[2],[4]

$ 400,000,000

Warehouse Facility II [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Basis spread on variable rate

^[2],[3]

2.00%

Warehouse Facility IV [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

^[2]

CAC Warehouse Funding LLC IV

Debt maturity date

^[2],[3]

Apr. 30, 2018

Debt facility financing amount

^[2],[4]

$ 75,000,000

Warehouse Facility IV [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Basis spread on variable rate

^[2],[3]

2.00%

Warehouse Facility V [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

^[2]

CAC Warehouse Funding LLC V

Debt maturity date

^[2],[5]

Aug. 18, 2019

Debt facility financing amount

^[2],[4]

$ 100,000,000

Warehouse Facility V [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Basis spread on variable rate

^[2],[3]

1.60%

Warehouse Facility VI [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

^[2]

CAC Warehouse Funding LLC VI

Debt maturity date

^[2],[3]

Sep. 30, 2018

Debt facility financing amount

^[2]

$ 75,000,000

Warehouse Facility VI [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Basis spread on variable rate

^[2],[3]

2.00%

Term ABS 2013-2 [Member]

Debt Instrument [Line Items]

Debt maturity date

Oct. 15, 2015

Term ABS 2014-1 [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

^[2]

Credit Acceptance Funding LLC 2014-1

Debt maturity date

^[2],[3]

Apr. 15, 2016

Debt facility financing amount

^[2]

$ 299,000,000

Term ABS 2014-2 [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

^[2]

Credit Acceptance Funding LLC 2014-2

Debt maturity date

^[2],[3]

Sep. 15, 2016

Debt facility financing amount

^[2]

$ 349,000,000.0

Term ABS 2015-1 [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

^[2]

Credit Acceptance Funding LLC 2015-1

Debt maturity date

^[2],[3]

Jan. 16, 2017

Debt facility financing amount

^[2]

$ 300,600,000

Term ABS 2015-2 [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

^[2]

Credit Acceptance Funding LLC 2015-2

Debt maturity date

^[2],[3]

Aug. 15, 2017

Debt facility financing amount

^[2]

$ 300,200,000

Term ABS 2016-1 [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

^[2]

Credit Acceptance Funding LLC 2016-1

Debt maturity date

^[2],[3]

Feb. 15, 2018

Debt facility financing amount

^[2],[4]

$ 385,000,000

Term ABS 2016-2 [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

^[2]

Credit Acceptance Funding LLC 2016-2

Debt maturity date

^[2],[3]

May 15, 2018

Debt facility financing amount

^[2]

$ 350,200,000

Term ABS 2016-3 [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

^[2]

Credit Acceptance Funding LLC 2016-3

Debt maturity date

^[2],[3]

Oct. 15, 2018

Debt facility financing amount

^[2]

$ 350,000,000

Term ABS 2017-1 [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

^[2]

Credit Acceptance Funding LLC 2017-1

Debt maturity date

^[2],[3]

Feb. 15, 2019

Debt facility financing amount

^[2]

$ 350,000,000

2021 Senior Notes [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

n/a

Debt maturity date

Feb. 15, 2021

Feb. 15, 2021

Debt facility financing amount

$ 300,000,000

$ 300,000,000

2023 Senior Notes [Member]

Debt Instrument [Line Items]

Wholly-owned Subsidiary

n/a

Debt maturity date

Mar. 15, 2023

Mar. 15, 2023

Debt facility financing amount

$ 250,000,000.0

$ 250,000,000

[1]	Excludes deferred debt issuance costs of $2.1 million and $2.4 million as of March 31, 2017 and December 31, 2016, respectively, which are included in other assets.
[2]	Financing made available only to a specified subsidiary of the Company.
[3]	Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets.
[4]	Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[5]	Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on August 18, 2021 will be due on that date.

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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X

- Definition

Identification of the contractual issuer of the debt instrument (for example, a subsidiary of the reporting entity).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

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X

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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