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Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 263,779 | $ 243,378 | $ 525,668 | $ 492,645
Depreciation and amortization | 12,931 | 10,999 | 25,823 | 21,191
Restructuring expenses | 6,215 |  | 7,080 |
Operating income (loss) | 15,593 | 25,136 | 36,242 | 59,976
Automotive Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring expenses |  |  | 3,247 |
Industrial Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring expenses |  |  | 3,833 |
Operating Segments | Automotive Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 240,823 | 215,812 | 480,842 | 437,645
Depreciation and amortization | 10,970 | 9,048 | 21,779 | 17,179
Restructuring expenses | 2,529 |  | 3,247 |
Operating income (loss) | 37,240 | 40,066 | 78,404 | 90,743
Operating Segments | Industrial Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 22,956 | 27,566 | 44,826 | 55,000
Depreciation and amortization | 1,301 | 1,288 | 2,652 | 2,706
Restructuring expenses | 3,686 |  | 3,833 |
Operating income (loss) | (7,881) | (2,719) | (14,561) | (5,134)
Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 660 | 663 | 1,392 | 1,306
Operating income (loss) | $ (13,766) | $ (12,211) | $ (27,601) | $ (25,633)

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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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