Contingent Liabilities - Additional Information (Detail) Tire in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Tire	Jun. 30, 2017 USD ($)	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	$ 137,794,000		137,794,000		$ 129,892,000
Increase in product liability reserve due to self insured incidents			22,025,000
Decrease in product liability reserve due to changes in estimated amounts on existing reserves			2,303,000
Company paid to resolve cases and claims			11,820,000
Current portion product liability reserve balance	44,978,000		44,978,000		$ 44,700,000
Product liability expenses	$ 12,155,000	$ 16,179,000	$ 27,223,000	$ 32,447,000