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Segment Reporting (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 258,939 | $ 235,853 | $ 784,607 | $ 728,498
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 100.00% | 100.00% | 100.00% | 100.00%
United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 125,936 | $ 104,033 | $ 369,798 | $ 337,697
United States | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 49.00% | 44.00% | 47.00% | 46.00%
China |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 22,756 | $ 25,741 | $ 71,887 | $ 66,168
China | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 9.00% | 11.00% | 9.00% | 9.00%
Germany |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 22,681 | $ 17,711 | $ 68,670 | $ 53,273
Germany | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 9.00% | 7.00% | 9.00% | 7.00%
South Korea |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 12,814 | $ 16,569 | $ 42,419 | $ 50,714
South Korea | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 5.00% | 7.00% | 5.00% | 7.00%
Japan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 16,672 | $ 15,727 | $ 43,520 | $ 43,103
Japan | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 6.00% | 7.00% | 6.00% | 6.00%
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 7,778 | $ 10,667 | $ 33,482 | $ 32,709
Canada | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 3.00% | 5.00% | 4.00% | 5.00%
Czech Republic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 10,742 | $ 9,175 | $ 33,563 | $ 29,826
Czech Republic | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 4.00% | 4.00% | 4.00% | 4.00%
United Kingdom |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 9,037 | $ 8,143 | $ 28,349 | $ 26,250
United Kingdom | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 3.00% | 3.00% | 4.00% | 4.00%
Romania |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 5,876 | $ 5,091 | $ 16,775 | $ 13,173
Romania | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 2.00% | 2.00% | 2.00% | 2.00%
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 24,647 | $ 22,996 | $ 76,144 | $ 75,585
Other | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 10.00% | 10.00% | 10.00% | 10.00%
Non U.S. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 133,003 | $ 131,820 | $ 414,809 | $ 390,801
Non U.S. | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 51.00% | 56.00% | 53.00% | 54.00%

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