Segment Reporting (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Product revenues	$ 662,082	$ 554,979	$ 369,588
Total product revenues in percentage	100.00%	100.00%	100.00%
United States
Segment Reporting Information [Line Items]
Product revenues	292,079	233,737	134,010
Total product revenues in percentage	44.00%	42.00%	36.00%
Germany
Segment Reporting Information [Line Items]
Product revenues	84,035	67,132	40,833
Total product revenues in percentage	13.00%	12.00%	11.00%
China
Segment Reporting Information [Line Items]
Product revenues	70,671	55,674	31,193
Total product revenues in percentage	11.00%	10.00%	9.00%
Korea
Segment Reporting Information [Line Items]
Product revenues	58,329	42,878	37,913
Total product revenues in percentage	9.00%	8.00%	10.00%
Japan
Segment Reporting Information [Line Items]
Product revenues	39,844	35,279	25,295
Total product revenues in percentage	6.00%	6.00%	7.00%
United Kingdom
Segment Reporting Information [Line Items]
Product revenues	18,864	13,194	10,686
Total product revenues in percentage	3.00%	2.00%	3.00%
Czech Republic
Segment Reporting Information [Line Items]
Product revenues	17,247	15,361	11,722
Total product revenues in percentage	3.00%	3.00%	3.00%
Mexico
Segment Reporting Information [Line Items]
Product revenues	15,670	14,988	21,529
Total product revenues in percentage	2.00%	3.00%	6.00%
Canada
Segment Reporting Information [Line Items]
Product revenues	14,254	17,582	12,305
Total product revenues in percentage	2.00%	3.00%	3.00%
Other
Segment Reporting Information [Line Items]
Product revenues	51,089	59,154	44,102
Total product revenues in percentage	7.00%	11.00%	12.00%
Foreign
Segment Reporting Information [Line Items]
Product revenues	$ 370,003	$ 321,242	$ 235,578
Total product revenues in percentage	56.00%	58.00%	64.00%