Summarized Financial Information of Unconsolidated Joint Ventures (Accounted for Under Equity Method of Accounting) (Detail)	12 Months Ended
	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--12-31
Rogers INOAC Corporation | Japan | Elastomeric Material Solutions
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--10-31
Rogers I N O A C Suzhou Corporation | China | Elastomeric Material Solutions
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--12-31