Joint Ventures (Accounted for Under Equity Method of Accounting) (Detail)	12 Months Ended
	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--12-31
Rogers INOAC Corporation (RIC) | Japan | Elastomeric Material Solutions
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--10-31
Rogers INOAC Suzhou Corporation (RIS) | China | Elastomeric Material Solutions
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--12-31