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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Sales	$ 126,836	$ 185,112	$ 184,673	$ 170,279	$ 162,986	$ 168,890	$ 162,701	$ 142,204	$ 666,900	$ 636,781	$ 600,064
United States [Member]
Revenue from External Customer [Line Items]
Sales									508,178	501,337	419,366
Germany [Member]
Revenue from External Customer [Line Items]
Sales									119,502	85,780	111,666
Other International [Member]
Revenue from External Customer [Line Items]
Sales									$ 39,220	$ 49,664	$ 69,032

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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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