Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Product revenues	$ 206,909us-gaap_SalesRevenueGoodsNet	$ 193,938us-gaap_SalesRevenueGoodsNet
Depreciation and amortization	7,459us-gaap_DepreciationAndAmortization	7,473us-gaap_DepreciationAndAmortization
Operating income (loss)	27,077us-gaap_OperatingIncomeLoss	25,038us-gaap_OperatingIncomeLoss
Operating Segments \| Automotive Segments
Segment Reporting Information [Line Items]
Product revenues	199,443	193,938
Depreciation and amortization	6,316	6,482
Operating income (loss)	40,682	35,174
Operating Segments \| Industrial Segments
Segment Reporting Information [Line Items]
Product revenues	7,466
Depreciation and amortization	489	107
Operating income (loss)	(1,106)	(1,550)
Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	654	884
Operating income (loss)	$ (12,499)	$ (8,586)

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.

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=31042434&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=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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