Contingent Liabilities - Additional Information (Detail) Tire in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Tire	Sep. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Minimum estimated sale of passenger car, light truck, SUV, radial medium truck and motorcycle tires per year in North America | Tire			30
Maximum estimated sale of passenger car, light truck, SUV, radial medium truck and motorcycle tires per year in North America | Tire			35
Estimated number of Company produced tires of different specifications | Tire			300
Product liability expenses, Minimum			$ 0
Product liability expenses, Maximum			33,000,000
Product liability reserve balance	$ 113,324,000		113,324,000		$ 138,000	$ 129,892,000
Increase in product liability reserve due to self insured incidents			33,048,000
Decrease in product liability reserve due to changes in estimated amounts on existing reserves	31,000,000	$ 41,000,000	34,676,000
Company paid to resolve cases and claims			14,940,000
Current portion product liability reserve balance	31,045,000		31,045,000			$ 44,700,000
Product liability expenses	$ (18,389,000)	$ (20,989,000)	$ 8,834,000	$ 11,458,000