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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)

X

- 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

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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