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Segment Reporting (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 232,720 | $ 213,441 | $ 448,434 | $ 420,350
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 | $ 113,138 | $ 98,767 | $ 214,878 | $ 194,071
United States | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 49.00% | 46.00% | 48.00% | 46.00%
South Korea |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 21,053 | $ 21,213 | $ 40,149 | $ 44,076
South Korea | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 9.00% | 10.00% | 9.00% | 10.00%
China |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 18,988 | $ 16,390 | $ 36,410 | $ 34,360
China | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 8.00% | 8.00% | 8.00% | 8.00%
Germany |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 18,424 | $ 18,799 | $ 36,591 | $ 37,639
Germany | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 8.00% | 9.00% | 8.00% | 9.00%
Czech Republic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 10,290 | $ 7,076 | $ 19,961 | $ 13,235
Czech Republic | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 4.00% | 3.00% | 4.00% | 3.00%
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 10,091 | $ 6,090 | $ 19,073 | $ 11,575
Canada | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 4.00% | 3.00% | 4.00% | 3.00%
Japan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 9,779 | $ 11,332 | $ 22,013 | $ 22,517
Japan | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 4.00% | 5.00% | 5.00% | 5.00%
United Kingdom |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 7,071 | $ 6,638 | $ 13,738 | $ 13,626
United Kingdom | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 3.00% | 3.00% | 3.00% | 3.00%
Mexico |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 5,980 | $ 5,326 | $ 11,561 | $ 10,759
Mexico | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 3.00% | 3.00% | 3.00% | 3.00%
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 17,906 | $ 21,810 | $ 34,060 | $ 38,492
Other | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 8.00% | 10.00% | 8.00% | 10.00%
Non U.S. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 119,582 | $ 114,674 | $ 233,556 | $ 226,279
Non U.S. | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues in percentage | 51.00% | 54.00% | 52.00% | 54.00%

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