Goodwill and Other Intangible Assets (Changes in Carrying Amount of Goodwill by Segment) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 237,107
Acquisition	32,305
Purchase accounting adjustment	(567)
Foreign currency translation adjustment	(3,960)
Ending balance	264,885
Advanced Connectivity Solutions
Goodwill [Roll Forward]
Beginning balance	51,693
Acquisition	0
Purchase accounting adjustment	0
Foreign currency translation adjustment	0
Ending balance	51,693
Elastomeric Material Solutions
Goodwill [Roll Forward]
Beginning balance	111,575
Acquisition	32,305
Purchase accounting adjustment	(567)
Foreign currency translation adjustment	(724)
Ending balance	142,589
Power Electronics Solutions
Goodwill [Roll Forward]
Beginning balance	71,615
Acquisition	0
Purchase accounting adjustment	0
Foreign currency translation adjustment	(3,236)
Ending balance	68,379
Other
Goodwill [Roll Forward]
Beginning balance	2,224
Acquisition	0
Purchase accounting adjustment	0
Foreign currency translation adjustment	0
Ending balance	$ 2,224