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Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 985,683 | $ 917,600 | $ 856,445
Depreciation and amortization | 44,972 | 37,764 | 31,029
Operating income (loss) | 97,324 | 106,119 | 121,319
Operating Segments | Automotive Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | 879,457 | 847,428 | 810,567
Depreciation and amortization | 36,801 | 31,826 | 27,251
Operating income (loss) | 166,604 | 174,027 | 170,358
Operating Segments | Industrial Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | 106,226 | 70,172 | 45,878
Depreciation and amortization | 5,399 | 3,789 | 1,726
Operating income (loss) | (14,751) | (16,702) | (2,461)
Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 2,772 | 2,149 | 2,052
Operating income (loss) | $ (54,529) | $ (51,206) | $ (46,578)

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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