Income Taxes - Components of Company's Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Postretirement and other employee benefits	$ 224,123	$ 175,643
Products liability	68,355ctb_DeferredTaxAssetsProductLiability	67,587ctb_DeferredTaxAssetsProductLiability
Net operating loss, capital loss, and tax credits carryforwards	28,812	28,947
All other items	48,087us-gaap_DeferredTaxAssetsOther	51,213us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	369,377us-gaap_DeferredTaxAssetsGross	323,390us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:
Property, plant and equipment	(141,374)	(134,075)
All other items	(10,455)us-gaap_DeferredTaxLiabilitiesOther	(7,736)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(151,829)us-gaap_DeferredTaxLiabilities	(141,811)us-gaap_DeferredTaxLiabilities
Deferred tax assets (liabilities), Net, Total	217,548us-gaap_DeferredTaxAssetsLiabilitiesNet	181,579us-gaap_DeferredTaxAssetsLiabilitiesNet
Valuation allowances	(33,303)	(32,370)
Net deferred tax asset	$ 184,245	$ 149,209

Deferred tax assets operating loss capital loss and tax credit carry forward.

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Deferred tax assets product liability.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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