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Segment Information and Major Customers - Sales Information by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Sales	$ 115,787	$ 114,092	$ 156,391	$ 143,791	$ 140,088	$ 140,335	$ 128,048	$ 120,806	$ 530,061	$ 529,277	$ 666,900
United States [Member]
Revenue from External Customer [Line Items]
Sales									300,853	288,843	508,178
Mexico [Member]
Revenue from External Customer [Line Items]
Sales									90,795	12,186	2,246
Germany [Member]
Revenue from External Customer [Line Items]
Sales									78,062	167,251	119,502
Other International [Member]
Revenue from External Customer [Line Items]
Sales									$ 60,351	$ 60,997	$ 36,974

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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