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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 209,008 | $ 206,783 | $ 201,424 | $ 203,828 | $ 173,000 | $ 165,259 | $ 157,489 | $ 160,566 | $ 821,043 | $ 656,314 | $ 641,443
Operating income |  |  |  |  |  |  |  |  | 130,779 | 83,852 | 76,255
Total assets | 1,125,134 |  |  |  | 1,056,500 |  |  |  | 1,125,134 | 1,056,500 | 930,355
Capital expenditures |  |  |  |  |  |  |  |  | 27,215 | 18,136 | 24,837
Depreciation & amortization |  |  |  |  |  |  |  |  | 44,099 | 37,847 | 34,054
Investment in unconsolidated joint ventures | 18,324 |  |  |  | 16,183 |  |  |  | 18,324 | 16,183 | 15,348
Equity income in unconsolidated joint ventures |  |  |  |  |  |  |  |  | 4,898 | 4,146 | 2,890
Advanced Connectivity Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 301,092 | 277,787 | 267,630
Operating income |  |  |  |  |  |  |  |  | 56,186 | 43,965 | 45,115
Total assets | 353,786 |  |  |  | 361,746 |  |  |  | 353,786 | 361,746 | 315,358
Capital expenditures |  |  |  |  |  |  |  |  | 9,900 | 7,569 | 15,532
Depreciation & amortization |  |  |  |  |  |  |  |  | 16,351 | 15,654 | 15,403
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 |  |  |  |  |  |  |  |  | 312,661 | 203,181 | 180,898
Operating income |  |  |  |  |  |  |  |  | 51,404 | 26,593 | 19,979
Total assets | 489,456 |  |  |  | 421,011 |  |  |  | 489,456 | 421,011 | 264,982
Capital expenditures |  |  |  |  |  |  |  |  | 7,563 | 4,051 | 4,103
Depreciation & amortization |  |  |  |  |  |  |  |  | 16,270 | 10,141 | 9,280
Investment in unconsolidated joint ventures |  |  |  |  | 16,183 |  |  |  |  | 16,183 | 15,348
Equity income in unconsolidated joint ventures |  |  |  |  |  |  |  |  | 4,898 | 4,146 | 2,890
Power Electronics Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 184,954 | 152,367 | 150,288
Operating income |  |  |  |  |  |  |  |  | 16,036 | 5,965 | 3,750
Total assets | 261,034 |  |  |  | 247,187 |  |  |  | 261,034 | 247,187 | 320,755
Capital expenditures |  |  |  |  |  |  |  |  | 9,238 | 6,009 | 4,185
Depreciation & amortization |  |  |  |  |  |  |  |  | 10,572 | 11,208 | 7,855
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 |  |  |  |  |  |  |  |  | 22,336 | 22,979 | 42,627
Operating income |  |  |  |  |  |  |  |  | 7,153 | 7,329 | 7,411
Total assets | 20,858 |  |  |  | 26,556 |  |  |  | 20,858 | 26,556 | 29,260
Capital expenditures |  |  |  |  |  |  |  |  | 514 | 507 | 1,017
Depreciation & amortization |  |  |  |  |  |  |  |  | 906 | 844 | 1,516
Investment in unconsolidated joint ventures | $ 0 |  |  |  | $ 0 |  |  |  | 0 | 0 | 0
Equity income in unconsolidated joint ventures |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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