Operating Segments and Geographic Information (Information About Reportable Segments) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 193,768	$ 221,842	$ 242,852	$ 239,798	$ 222,942	$ 226,863	$ 214,675	$ 214,611	$ 898,260	$ 879,091	$ 821,043
Total net sales											821,043
Operating income									110,481	112,711	129,139
Total assets	1,273,181				1,279,344				1,273,181	1,279,344	1,125,134
Capital expenditures									51,597	90,549	27,215
Depreciation & amortization									49,162	50,073	44,099
Investment in unconsolidated joint ventures	16,461				18,667				16,461	18,667	18,324
Equity income in unconsolidated joint ventures									5,319	5,501	4,898
Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales									316,592	294,154	301,092
Total net sales											301,092
Operating income									48,654	33,827	55,410
Total assets	402,398				396,075				402,398	396,075	353,786
Capital expenditures									22,156	61,425	9,900
Depreciation & amortization									18,267	20,121	16,351
Investment in unconsolidated joint ventures	0				0				0	0	0
Equity income in unconsolidated joint ventures									0	0	0
Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales									361,603	341,364	312,661
Total net sales											312,661
Operating income									57,080	52,502	50,908
Total assets	569,484				588,841				569,484	588,841	489,456
Capital expenditures									8,550	10,917	7,563
Depreciation & amortization									19,887	18,501	16,270
Investment in unconsolidated joint ventures					18,667					18,667	18,324
Equity income in unconsolidated joint ventures										5,501	4,898
Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales									198,535	223,338	184,954
Total net sales											184,954
Operating income									(1,437)	19,648	15,668
Total assets	278,763				273,212				278,763	273,212	261,034
Capital expenditures									20,191	18,051	9,238
Depreciation & amortization									10,260	10,640	10,572
Investment in unconsolidated joint ventures	0				0				0	0	0
Equity income in unconsolidated joint ventures									0	0	0
Other
Segment Reporting Information [Line Items]
Net sales									21,530	20,235	22,336
Total net sales											22,336
Operating income									6,184	6,734	7,153
Total assets	22,536				21,216				22,536	21,216	20,858
Capital expenditures									700	156	514
Depreciation & amortization									748	811	906
Investment in unconsolidated joint ventures	$ 0				$ 0				0	0	0
Equity income in unconsolidated joint ventures									0	0	$ 0
Transferred over Time
Segment Reporting Information [Line Items]
Net sales									228,501	244,657
Transferred over Time | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales									0	0
Transferred over Time | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales									12,687	5,788
Transferred over Time | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales									197,702	221,896
Transferred over Time | Other
Segment Reporting Information [Line Items]
Net sales									18,112	16,973
Transferred at a point in time
Segment Reporting Information [Line Items]
Net sales									669,759	634,434
Transferred at a point in time | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales									316,592	294,154
Transferred at a point in time | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales									348,916	335,576
Transferred at a point in time | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales									833	1,442
Transferred at a point in time | Other
Segment Reporting Information [Line Items]
Net sales									$ 3,418	$ 3,262