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Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 258,939 | $ 235,853 | $ 784,607 | $ 728,498
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Depreciation and amortization | $ 12,898 | $ 11,472 | $ 38,721 | $ 32,663
Restructuring expenses | 5,818 |  | 12,898 |
Operating income (loss) | 15,713 | 16,134 | 51,955 | 76,110
Automotive Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring expenses | 4,332 |  | 7,578 |
Industrial Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring expenses | 1,486 |  | 5,320 |
Operating Segments | Automotive Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 236,576 | $ 215,175 | $ 717,655 | $ 652,820
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Depreciation and amortization | $ 11,060 | $ 9,423 | $ 32,839 | $ 26,602
Restructuring expenses | 4,332 |  | 7,578 |
Operating income (loss) | 38,023 | 37,142 | 116,427 | 127,885
Operating Segments | Industrial Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 22,363 | $ 20,678 | $ 66,952 | $ 75,678
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Depreciation and amortization | $ 1,170 | $ 1,334 | $ 3,822 | $ 4,040
Restructuring expenses | 1,486 |  | 5,320 |
Operating income (loss) | $ (4,449) | $ (5,613) | $ (19,010) | $ (10,747)
Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Depreciation and amortization | $ 668 | $ 715 | $ 2,060 | $ 2,021
Operating income (loss) | $ (17,861) | $ (15,395) | $ (45,462) | $ (41,028)

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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