Common shares reserved for compensation plans and contributions.

No definition available.

Name:	ctb_CommonSharesReservedForCompensationPlansAndContributions
Namespace Prefix:	ctb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of common shares initially delivered under share repurchase program.

+ References

No definition available.

+ Details

Name:	ctb_PercentageOfCommonSharesInitiallyDeliveredUnderShareRepurchaseProgram
Namespace Prefix:	ctb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Stock repurchase program termination month and year.

+ References

No definition available.

+ Details

Name:	ctb_StockRepurchaseProgramTerminationMonthAndYear
Namespace Prefix:	ctb_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

The cash outflow to reacquire common stock during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

+ Details

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

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=ctb_AcceleratedShareRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Common Stock - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended	12 Months Ended
	Aug. 06, 2014	Sep. 30, 2014	Dec. 31, 2014	Aug. 06, 2014
Accelerated Share Repurchases [Line Items]
Amount paid to counter party under share repurchase program			$ 200,000
Common shares reserved for compensation plans and contributions			10,500,000
ASR Program [Member]
Accelerated Share Repurchases [Line Items]
Share repurchase, amount authorized	200,000			200,000
Final repurchase date			2015-02
Share repurchase, common stock shares		5,567,154	5,567,154
Percentage Of Common Shares Initially Delivered Under Share Repurchase Program	80.00%			80.00%
Amount paid to counter party under share repurchase program	$ 200,000		$ 200,000