Segment Reporting (Detail) (USD $) | 3 Months Ended |
In Thousands, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014 |
Segment Reporting Information [Line Items] | | |
Product revenues | $206,909 | $193,938 |
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 | 95,304 | 85,067 |
United States | Sales Revenue, Net | Geographic Concentration Risk | | |
Segment Reporting Information [Line Items] | | |
Total product revenues in percentage | 46.00% | 44.00% |
South Korea | | |
Segment Reporting Information [Line Items] | | |
Product revenues | 22,863 | 21,915 |
South Korea | Sales Revenue, Net | Geographic Concentration Risk | | |
Segment Reporting Information [Line Items] | | |
Total product revenues in percentage | 11.00% | 11.00% |
Germany | | |
Segment Reporting Information [Line Items] | | |
Product revenues | 18,840 | 22,476 |
Germany | Sales Revenue, Net | Geographic Concentration Risk | | |
Segment Reporting Information [Line Items] | | |
Total product revenues in percentage | 9.00% | 12.00% |
China | | |
Segment Reporting Information [Line Items] | | |
Product revenues | 17,970 | 15,944 |
China | Sales Revenue, Net | Geographic Concentration Risk | | |
Segment Reporting Information [Line Items] | | |
Total product revenues in percentage | 9.00% | 8.00% |
Japan | | |
Segment Reporting Information [Line Items] | | |
Product revenues | 11,185 | 10,465 |
Japan | Sales Revenue, Net | Geographic Concentration Risk | | |
Segment Reporting Information [Line Items] | | |
Total product revenues in percentage | 5.00% | 6.00% |
United Kingdom | | |
Segment Reporting Information [Line Items] | | |
Product revenues | 6,988 | 6,600 |
United Kingdom | Sales Revenue, Net | Geographic Concentration Risk | | |
Segment Reporting Information [Line Items] | | |
Total product revenues in percentage | 3.00% | 3.00% |
Czech Republic | | |
Segment Reporting Information [Line Items] | | |
Product revenues | 6,159 | 6,086 |
Czech Republic | Sales Revenue, Net | Geographic Concentration Risk | | |
Segment Reporting Information [Line Items] | | |
Total product revenues in percentage | 3.00% | 3.00% |
Canada | | |
Segment Reporting Information [Line Items] | | |
Product revenues | 5,485 | 3,162 |
Canada | Sales Revenue, Net | Geographic Concentration Risk | | |
Segment Reporting Information [Line Items] | | |
Total product revenues in percentage | 3.00% | 2.00% |
Mexico | | |
Segment Reporting Information [Line Items] | | |
Product revenues | 5,433 | 4,703 |
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 | 16,682 | 17,520 |
Other | Sales Revenue, Net | Geographic Concentration Risk | | |
Segment Reporting Information [Line Items] | | |
Total product revenues in percentage | 8.00% | 9.00% |
Non U.S. | | |
Segment Reporting Information [Line Items] | | |
Product revenues | $111,605 | $108,871 |
Non U.S. | Sales Revenue, Net | Geographic Concentration Risk | | |
Segment Reporting Information [Line Items] | | |
Total product revenues in percentage | 54.00% | 56.00% |