Restructuring - Additional Information (Details)			3 Months Ended				6 Months Ended	9 Months Ended		12 Months Ended
	Jan. 25, 2020 USD ($)	Jan. 17, 2019 Employee	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jan. 24, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring expense			$ 0			$ 811,000		$ 12,404,000	$ 7,442,000
Accrued restructuring balance			461,000				$ 461,000	461,000
Restructuring, expected number of positions eliminated | Employee		300
Restructuring, remaining number of positions after elimination | Employee		400
Employee Severance And Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring expense			0	$ 1,474,000
Other Restructuring
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring expense			0		$ 2,712,000			2,712,000
Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring expense			$ 0				$ 0	$ 12,404,000
Facility Closing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring expense						811,000			7,442,000	$ 759,000
Restructuring, cost related to facility closing						811,000			7,442,000	$ 8,315,000
COOCSA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interest, ownership percentage											41.57%
Equity method investment, total cash price											$ 54,500,000
COOCSA | Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring expense					$ 10,930,000
Member Of Joint Venture | Other Restructuring
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments for restructuring	$ 15,984,000
Minority Interest Shareholder | Other Restructuring
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments for restructuring	$ 7,772,000
International Tire | Facility Closing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring expense						$ 363,000			$ 677,000