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Segment Reporting (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 985,683 | $ 917,600 | $ 856,445
Sales Revenue, Net | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Total product revenues in percentage | 100.00% | 100.00% | 100.00%
United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 454,669 | $ 449,065 | $ 393,206
United States | Sales Revenue, Net | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Total product revenues in percentage | 46.00% | 49.00% | 46.00%
China |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 93,645 | $ 80,493 | $ 76,864
China | Sales Revenue, Net | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Total product revenues in percentage | 9.00% | 9.00% | 9.00%
Germany |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 71,768 | $ 70,258 | $ 74,003
Germany | Sales Revenue, Net | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Total product revenues in percentage | 7.00% | 8.00% | 9.00%
South Korea |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 64,715 | $ 75,396 | $ 84,758
South Korea | Sales Revenue, Net | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Total product revenues in percentage | 7.00% | 8.00% | 10.00%
Japan |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 57,467 | $ 45,103 | $ 46,058
Japan | Sales Revenue, Net | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Total product revenues in percentage | 6.00% | 5.00% | 5.00%
Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 46,368 | $ 37,954 | $ 27,076
Canada | Sales Revenue, Net | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Total product revenues in percentage | 5.00% | 4.00% | 3.00%
Czech Republic |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 38,828 | $ 38,164 | $ 28,273
Czech Republic | Sales Revenue, Net | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Total product revenues in percentage | 4.00% | 4.00% | 3.00%
United Kingdom |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 36,033 | $ 28,540 | $ 25,952
United Kingdom | Sales Revenue, Net | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Total product revenues in percentage | 4.00% | 3.00% | 3.00%
Mexico |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 22,684 | $ 22,767 | $ 28,274
Mexico | Sales Revenue, Net | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Total product revenues in percentage | 2.00% | 2.00% | 3.00%
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 99,506 | $ 69,860 | $ 71,981
Other | Sales Revenue, Net | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Total product revenues in percentage | 10.00% | 8.00% | 9.00%
Non U.S. |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 531,014 | $ 468,535 | $ 463,239
Non U.S. | Sales Revenue, Net | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Total product revenues in percentage | 54.00% | 51.00% | 54.00%

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