This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Restructuring and Impairment Charges (Restructuring and Impairment Charges) (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring and Impairment
Pension settlement charge		$ 5,200,000
Restructuring charges	$ 471,000		$ 700,000
Total Charges for Restructuring and Impairment			734,000	$ 0	$ 5,390,000
Employee Severance
Restructuring and Impairment
Restructuring charges			600,000
Elastomeric Material Solutions \| Pension Settlement
Restructuring and Impairment
Pension settlement charge			0		1,332,000
Elastomeric Material Solutions \| Employee Severance
Restructuring and Impairment
Restructuring charges			176,000		0
Elastomeric Material Solutions \| Asset Impairments
Restructuring and Impairment
Allocated Solicore impairment			0		42,000
Advanced Connectivity Solutions \| Pension Settlement
Restructuring and Impairment
Pension settlement charge			0		1,954,000
Advanced Connectivity Solutions \| Employee Severance
Restructuring and Impairment
Restructuring charges			375,000		0
Advanced Connectivity Solutions \| Asset Impairments
Restructuring and Impairment
Allocated Solicore impairment			0		62,000
Power Electronics Solutions \| Pension Settlement
Restructuring and Impairment
Pension settlement charge			0		1,921,000
Power Electronics Solutions \| Employee Severance
Restructuring and Impairment
Restructuring charges			183,000
Power Electronics Solutions \| Asset Impairments
Restructuring and Impairment
Allocated Solicore impairment			0		61,000
Other \| Pension Settlement
Restructuring and Impairment
Pension settlement charge			0		17,000
Other \| Employee Severance
Restructuring and Impairment
Restructuring charges			0		0
Other \| Asset Impairments
Restructuring and Impairment
Allocated Solicore impairment			$ 0		$ 1,000