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Operating Segments and Geographic Information (Information About Reportable Segments) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 222,942 | $ 226,863 | $ 214,675 | $ 214,611 | $ 209,008 | $ 206,783 | $ 201,424 | $ 203,828 | $ 879,091 | $ 821,043 | $ 656,314
Operating income |  |  |  |  |  |  |  |  | 112,711 | 129,139 | 80,897
Total assets | 1,279,344 |  |  |  | 1,125,134 |  |  |  | 1,279,344 | 1,125,134 | 1,056,500
Capital expenditures |  |  |  |  |  |  |  |  | 47,115 | 27,215 | 18,136
Capital expenditures, excluding ISOLA acquisition |  |  |  |  |  |  |  |  | 90,549 |  |
Depreciation & amortization |  |  |  |  |  |  |  |  | 50,073 | 44,099 | 37,847
Investment in unconsolidated joint ventures | 18,667 |  |  |  | 18,324 |  |  |  | 18,667 | 18,324 | 16,183
Equity income in unconsolidated joint ventures |  |  |  |  |  |  |  |  | 5,501 | 4,898 | 4,146
Advanced Connectivity Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 294,154 | 301,092 | 277,787
Operating income |  |  |  |  |  |  |  |  | 33,827 | 55,410 | 42,455
Total assets | 396,075 |  |  |  | 353,786 |  |  |  | 396,075 | 353,786 | 361,746
Capital expenditures |  |  |  |  |  |  |  |  |  | 9,900 | 7,569
Capital expenditures, excluding ISOLA acquisition |  |  |  |  |  |  |  |  | 61,425 |  |
Depreciation & amortization |  |  |  |  |  |  |  |  | 20,121 | 16,351 | 15,654
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 |  |  |  |  |  |  |  |  | 341,364 | 312,661 | 203,181
Operating income |  |  |  |  |  |  |  |  | 52,502 | 50,908 | 25,884
Total assets | 588,841 |  |  |  | 489,456 |  |  |  | 588,841 | 489,456 | 421,011
Capital expenditures |  |  |  |  |  |  |  |  |  | 7,563 | 4,051
Capital expenditures, excluding ISOLA acquisition |  |  |  |  |  |  |  |  | 10,917 |  |
Depreciation & amortization |  |  |  |  |  |  |  |  | 18,501 | 16,270 | 10,141
Investment in unconsolidated joint ventures | 18,667 |  |  |  | 18,324 |  |  |  | 18,667 | 18,324 | 16,183
Equity income in unconsolidated joint ventures |  |  |  |  |  |  |  |  | 5,501 | 4,898 | 4,146
Power Electronics Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 223,338 | 184,954 | 152,367
Operating income |  |  |  |  |  |  |  |  | 19,648 | 15,668 | 5,229
Total assets | 273,212 |  |  |  | 261,034 |  |  |  | 273,212 | 261,034 | 247,187
Capital expenditures |  |  |  |  |  |  |  |  |  | 9,238 | 6,009
Capital expenditures, excluding ISOLA acquisition |  |  |  |  |  |  |  |  | 18,051 |  |
Depreciation & amortization |  |  |  |  |  |  |  |  | 10,640 | 10,572 | 11,208
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 |  |  |  |  |  |  |  |  | 20,235 | 22,336 | 22,979
Operating income |  |  |  |  |  |  |  |  | 6,734 | 7,153 | 7,329
Total assets | 21,216 |  |  |  | 20,858 |  |  |  | 21,216 | 20,858 | 26,556
Capital expenditures |  |  |  |  |  |  |  |  |  | 514 | 507
Capital expenditures, excluding ISOLA acquisition |  |  |  |  |  |  |  |  | 156 |  |
Depreciation & amortization |  |  |  |  |  |  |  |  | 811 | 906 | 844
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 |  |  |  |  |  |  |  |  | 244,657 |  |
Transferred over Time | Advanced Connectivity Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 |  |
Transferred over Time | Elastomeric Material Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 5,788 |  |
Transferred over Time | Power Electronics Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 221,896 |  |
Transferred over Time | Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 16,973 |  |
Transferred at a point in time |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 634,434 |  |
Transferred at a point in time | Advanced Connectivity Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 294,154 |  |
Transferred at a point in time | Elastomeric Material Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 335,576 |  |
Transferred at a point in time | Power Electronics Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,442 |  |
Transferred at a point in time | Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 3,262 |  |

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