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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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