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Basis of Presentation - Revised Presentation of Previously Issued Financial Statements (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Net revenues: |  |
Products | $ 496,677 | $ 387,938
Services | 57,598 | 49,215
Total net revenues | 554,275 | 437,153
Cost of revenues: |  |
Cost of products | 261,321 | 205,834
Cost of services | 30,099 | 25,772
Total cost of revenues | $ 291,420 | 231,606
As Previously Reported [Member] |  |
Net revenues: |  |
Products |  | 392,922
Services |  | 44,231
Total net revenues |  | 437,153
Cost of revenues: |  |
Cost of products |  | 205,060
Cost of services |  | 26,546
Total cost of revenues |  | 231,606
Adjustment [Member] |  |
Net revenues: |  |
Products |  | (4,984)
Services |  | 4,984
Cost of revenues: |  |
Cost of products |  | 774
Cost of services |  | $ (774)

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