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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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue from External Customer [Line Items]
Sales	$ 162,986	$ 168,890	$ 162,701	$ 142,204	$ 139,013	$ 158,078	$ 160,138	$ 142,835	$ 636,781	$ 600,064	$ 630,007
United States [Member]
Revenue from External Customer [Line Items]
Sales									501,337	419,366	381,382
Germany [Member]
Revenue from External Customer [Line Items]
Sales									85,780	111,666	150,987
Other International [Member]
Revenue from External Customer [Line Items]
Sales									$ 49,664	$ 69,032	$ 97,638

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+ References

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales 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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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