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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 210,672 | $ 201,944 | $ 191,157 | $ 198,810 | $ 193,768 | $ 221,842 | $ 242,852 | $ 239,798 | $ 802,583 | $ 898,260 | $ 879,091
Operating income (loss) |  |  |  |  |  |  |  |  | 67,334 | 110,481 | 112,711
Total assets | 1,264,005 |  |  |  | 1,273,181 |  |  |  | 1,264,005 | 1,273,181 | 1,279,344
Capital expenditures |  |  |  |  |  |  |  |  | 40,385 | 51,597 | 90,549
Depreciation & amortization |  |  |  |  |  |  |  |  | 71,425 | 49,162 | 50,073
Investment in unconsolidated joint ventures | 15,248 |  |  |  | 16,461 |  |  |  | 15,248 | 16,461 | 18,667
Equity income in unconsolidated joint ventures |  |  |  |  |  |  |  |  | 4,877 | 5,319 | 5,501
Advanced Connectivity Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 268,699 | 316,592 | 294,154
Operating income (loss) |  |  |  |  |  |  |  |  | 38,202 | 48,654 | 33,827
Total assets | 407,667 |  |  |  | 402,398 |  |  |  | 407,667 | 402,398 | 396,075
Capital expenditures |  |  |  |  |  |  |  |  | 11,849 | 22,156 | 61,425
Depreciation & amortization |  |  |  |  |  |  |  |  | 13,762 | 18,267 | 20,121
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 |  |  |  |  |  |  |  |  | 328,177 | 361,603 | 341,364
Operating income (loss) |  |  |  |  |  |  |  |  | 30,817 | 57,080 | 52,502
Total assets | 504,199 |  |  |  | 569,484 |  |  |  | 504,199 | 569,484 | 588,841
Capital expenditures |  |  |  |  |  |  |  |  | 16,214 | 8,550 | 10,917
Depreciation & amortization |  |  |  |  |  |  |  |  | 47,159 | 19,887 | 18,501
Investment in unconsolidated joint ventures | 15,248 |  |  |  | 16,461 |  |  |  | 15,248 | 16,461 | 18,667
Equity income in unconsolidated joint ventures |  |  |  |  |  |  |  |  | 4,877 | 5,319 | 5,501
Power Electronics Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 189,980 | 198,535 | 223,338
Operating income (loss) |  |  |  |  |  |  |  |  | (6,179) | (1,437) | 19,648
Total assets | 338,419 |  |  |  | 278,763 |  |  |  | 338,419 | 278,763 | 273,212
Capital expenditures |  |  |  |  |  |  |  |  | 11,840 | 20,191 | 18,051
Depreciation & amortization |  |  |  |  |  |  |  |  | 9,831 | 10,260 | 10,640
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 |  |  |  |  |  |  |  |  | 15,727 | 21,530 | 20,235
Operating income (loss) |  |  |  |  |  |  |  |  | 4,494 | 6,184 | 6,734
Total assets | 13,720 |  |  |  | 22,536 |  |  |  | 13,720 | 22,536 | 21,216
Capital expenditures |  |  |  |  |  |  |  |  | 482 | 700 | 156
Depreciation & amortization |  |  |  |  |  |  |  |  | 673 | 748 | 811
Investment in unconsolidated joint ventures | $ 0 |  |  |  | $ 0 |  |  |  | 0 | 0 | 0
Equity income in unconsolidated joint ventures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Recognized over time |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 215,107 | 228,501 | 244,657
Recognized over time | Advanced Connectivity Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 902 | 0 | 0
Recognized over time | Elastomeric Material Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 10,614 | 12,687 | 5,788
Recognized over time | Power Electronics Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 189,140 | 197,702 | 221,896
Recognized over time | Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,451 | 18,112 | 16,973
Recognized at a point in time |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 587,476 | 669,759 | 634,434
Recognized at a point in time | Advanced Connectivity Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 267,797 | 316,592 | 294,154
Recognized at a point in time | Elastomeric Material Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 317,563 | 348,916 | 335,576
Recognized at a point in time | Power Electronics Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 840 | 833 | 1,442
Recognized at a point in time | Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 1,276 | $ 3,418 | $ 3,262

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