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Segment Reporting (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Product revenues | $ 261,889 | $ 249,267
Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 100.00% | 100.00%
United States |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 120,350 | $ 119,523
United States | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 46.00% | 48.00%
China |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 24,204 | $ 20,465
China | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 9.00% | 8.00%
Germany |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 22,362 | $ 17,868
Germany | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 9.00% | 7.00%
South Korea |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 13,822 | $ 16,391
South Korea | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 5.00% | 7.00%
Japan |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 13,573 | $ 14,283
Japan | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 5.00% | 6.00%
Canada |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 13,113 | $ 10,929
Canada | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 5.00% | 4.00%
Czech Republic |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 11,715 | $ 10,707
Czech Republic | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 4.00% | 4.00%
United Kingdom |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 10,845 | $ 9,668
United Kingdom | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 4.00% | 4.00%
Mexico |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 6,298 | $ 5,370
Mexico | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 3.00% | 2.00%
Other |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 25,607 | $ 24,063
Other | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 10.00% | 10.00%
Non U.S. |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 141,539 | $ 129,744
Non U.S. | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 54.00% | 52.00%

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