Schedule of Performance Based Units Earned Under Long-Term Incentive Plans (Detail) (Performance stock units long term incentive plan 2010-2012 [Member])	9 Months Ended
Sep. 30, 2012
Performance stock units long term incentive plan 2010-2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock units outstanding at January 1, 2012	61,450
Accrued dividend equivalents	1,182
Performance stock units outstanding at September 30, 2012	62,632

Share-based compensation arrangement by share-based payment award equity instruments other than options nonvested accrued dividend equivalents.

No definition available.

Name:	ctb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAccruedDividendEquivalents
Namespace Prefix:	ctb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration