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Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Product revenues	$ 243,378	$ 232,720	$ 492,645	$ 448,434
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	$ 114,141	$ 113,138	$ 233,664	$ 214,878
United States | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	47.00%	49.00%	47.00%	48.00%
China
Segment Reporting Information [Line Items]
Product revenues	$ 19,962	$ 18,988	$ 40,427	$ 36,410
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	$ 17,694	$ 18,424	$ 35,562	$ 36,591
Germany | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	7.00%	8.00%	7.00%	8.00%
South Korea
Segment Reporting Information [Line Items]
Product revenues	$ 17,754	$ 21,053	$ 34,145	$ 40,149
South Korea | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	7.00%	9.00%	7.00%	9.00%
Japan
Segment Reporting Information [Line Items]
Product revenues	$ 13,093	$ 9,779	$ 27,376	$ 22,013
Japan | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	5.00%	4.00%	6.00%	5.00%
Canada
Segment Reporting Information [Line Items]
Product revenues	$ 11,113	$ 10,091	$ 22,042	$ 19,073
Canada | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	5.00%	4.00%	5.00%	4.00%
Czech Republic
Segment Reporting Information [Line Items]
Product revenues	$ 9,944	$ 10,290	$ 20,651	$ 19,961
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	$ 8,439	$ 7,071	$ 18,107	$ 13,738
United Kingdom | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	4.00%	3.00%	4.00%	3.00%
Mexico
Segment Reporting Information [Line Items]
Product revenues	$ 5,322	$ 5,980	$ 10,692	$ 11,561
Mexico | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	2.00%	3.00%	2.00%	3.00%
Other
Segment Reporting Information [Line Items]
Product revenues	$ 25,916	$ 17,906	$ 49,979	$ 34,060
Other | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	11.00%	8.00%	10.00%	8.00%
Non U.S.
Segment Reporting Information [Line Items]
Product revenues	$ 129,237	$ 119,582	$ 258,981	$ 233,556
Non U.S. | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	53.00%	51.00%	53.00%	52.00%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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