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Segment Reporting (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues | $ 171,182 | $ 141,058 | $ 479,792 | $ 406,737
Total product revenues in percentage | 100.00% | 100.00% | 100.00% | 100.00%
United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues | 76,543 | 60,012 | 211,462 | 173,233
Total product revenues in percentage | 45.00% | 42.00% | 44.00% | 43.00%
Germany |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues | 20,847 | 17,773 | 61,332 | 49,405
Total product revenues in percentage | 12.00% | 13.00% | 13.00% | 12.00%
China |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues | 18,285 | 15,694 | 47,972 | 43,510
Total product revenues in percentage | 11.00% | 11.00% | 10.00% | 11.00%
South Korea |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues | 13,546 | 10,716 | 39,069 | 31,213
Total product revenues in percentage | 8.00% | 8.00% | 8.00% | 8.00%
Japan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues | 10,281 | 10,294 | 28,591 | 24,014
Total product revenues in percentage | 6.00% | 7.00% | 6.00% | 6.00%
United Kingdom |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues | 5,180 | 3,407 | 13,319 | 12,959
Total product revenues in percentage | 3.00% | 2.00% | 3.00% | 3.00%
Mexico |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues | 4,230 | 3,581 | 11,696 | 11,467
Total product revenues in percentage | 2.00% | 3.00% | 2.00% | 3.00%
Czech Republic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues | 4,114 | 4,375 | 11,893 | 12,102
Total product revenues in percentage | 2.00% | 3.00% | 3.00% | 3.00%
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues | 3,432 | 2,782 | 10,533 | 9,527
Total product revenues in percentage | 2.00% | 2.00% | 2.00% | 2.00%
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total product revenues | $ 14,724 | $ 12,424 | $ 43,925 | $ 39,307
Total product revenues in percentage | 9.00% | 9.00% | 9.00% | 10.00%

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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