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Segment Reporting (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 263,779 | $ 243,378 | $ 525,668 | $ 492,645
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 | $ 123,512 | $ 114,141 | $ 243,862 | $ 233,664
United States | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 47.00% | 47.00% | 46.00% | 47.00%
China |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 24,927 | $ 19,962 | $ 49,131 | $ 40,427
China | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 9.00% | 8.00% | 9.00% | 8.00%
Germany |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 23,626 | $ 17,694 | $ 45,988 | $ 35,562
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 | $ 15,783 | $ 17,754 | $ 29,605 | $ 34,145
South Korea | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 6.00% | 7.00% | 6.00% | 7.00%
Japan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 13,275 | $ 13,093 | $ 26,848 | $ 27,376
Japan | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 5.00% | 5.00% | 5.00% | 6.00%
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 12,590 | $ 11,113 | $ 25,703 | $ 22,042
Canada | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 5.00% | 5.00% | 5.00% | 5.00%
Czech Republic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 11,106 | $ 9,944 | $ 22,821 | $ 20,651
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 | $ 8,467 | $ 8,439 | $ 19,312 | $ 18,107
United Kingdom | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 3.00% | 4.00% | 4.00% | 4.00%
Mexico |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 4,848 | $ 5,322 | $ 11,146 | $ 10,692
Mexico | 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 | $ 25,645 | $ 25,916 | $ 51,252 | $ 49,979
Other | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 10.00% | 11.00% | 10.00% | 10.00%
Non U.S. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 140,267 | $ 129,237 | $ 281,806 | $ 258,981
Non U.S. | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 53.00% | 53.00% | 54.00% | 53.00%

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