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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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Product revenues	$ 232,720	$ 213,441	$ 448,434	$ 420,350
Depreciation and amortization	9,383	7,864	17,547	15,323
Operating income (loss)	22,353	26,670	52,238	53,747
Operating Segments | Automotive Segments
Segment Reporting Information [Line Items]
Product revenues	211,640	200,954	422,076	400,397
Depreciation and amortization	7,652	6,885	14,935	13,201
Operating income (loss)	36,162	42,070	78,863	82,752
Operating Segments | Industrial Segments
Segment Reporting Information [Line Items]
Product revenues	21,080	12,487	26,358	19,953
Depreciation and amortization	1,199	404	1,589	893
Operating income (loss)	(7,113)	(1,987)	(9,729)	(3,274)
Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	532	575	1,023	1,229
Operating income (loss)	$ (6,696)	$ (13,413)	$ (16,896)	$ (25,731)

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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=66902209&loc=d3e3602-108585

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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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