Contingent Liabilities - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Tire	Jun. 30, 2012	Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]
Minimum estimated sale of passenger, light truck, SUV, radial medium truck and motorcycle tires per year in North America			30,000,000
Maximum estimated sale of passenger, light truck, SUV, radial medium truck and motorcycle tires per year in North America			35,000,000
Estimated number of Company produced tires of different specifications			300,000,000
Minimum costs of resolved cases			$ 0
Maximum costs of resolved cases			33,000,000
Increased its products liability reserve	14,181,000		28,563,000
Increase in products liability reserve due to self insured incidents	12,609,000		25,218,000
Increase in products liability reserve due to revised estimates of future settlements for unasserted and premature claims	1,904,000		4,232,000
Decrease in products liability reserve due to changes in estimated amounts on existing reserves	332,000		887,000
Period for resolution of few cases			5 years
Company paid to resolve cases and claims	14,723,000		23,840,000
Products liability reserve balance	211,072,000		211,072,000		206,349,000
Current portion products liability reserve balance	70,113,000		70,113,000		70,267,000
Products liability expenses	$ 21,505,000	$ 26,422,000	$ 42,202,000	$ 53,419,000