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Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Product revenues	$ 230,381	$ 240,056	$ 243,326	$ 257,921	$ 256,015	[1]	$ 261,504	[1]	$ 266,400	[1]	$ 264,586	[1]	$ 971,684	$ 1,048,505	$ 993,991
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember		us-gaap:ProductMember		us-gaap:ProductMember		us-gaap:ProductMember		us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
United States
Segment Reporting Information [Line Items]
Product revenues													$ 440,316	$ 488,926	$ 454,669
Germany
Segment Reporting Information [Line Items]
Product revenues													81,315	88,366	71,768
Japan
Segment Reporting Information [Line Items]
Product revenues													76,197	62,633	57,467
China
Segment Reporting Information [Line Items]
Product revenues													71,461	93,628	93,645
South Korea
Segment Reporting Information [Line Items]
Product revenues													63,339	58,717	64,715
Czech Republic
Segment Reporting Information [Line Items]
Product revenues													38,888	42,665	38,828
Canada
Segment Reporting Information [Line Items]
Product revenues													37,804	44,500	46,368
United Kingdom
Segment Reporting Information [Line Items]
Product revenues													31,357	37,533	36,033
Romania
Segment Reporting Information [Line Items]
Product revenues													26,213	22,435	18,050
Other
Segment Reporting Information [Line Items]
Product revenues													104,794	109,102	112,448
Non U.S.
Segment Reporting Information [Line Items]
Product revenues													$ 531,368	$ 559,579	$ 539,322
[1] Product revenues for 2018 have been adjusted to conform with the current year presentation, related to a reclassification of customer relationship amortization from product revenues to selling, general and administrative expenses.  See Note 2, “Significant Accounting Policies” to the consolidated financial statements included in this Report for further details regarding these adjustments.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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