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Basis of Presentation - Revised Presentation of Previously Issued Financial Statements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Net revenues: |  |  |  |
Total net revenues | $ 487,152 | $ 486,267 | $ 1,614,567 | $ 1,404,177
Cost of revenues: |  |  |  |
Total cost of revenues | 255,292 | 258,272 | 844,975 | 751,052
Products [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues | 426,255 | 428,891 | 1,432,931 | 1,243,146
Cost of revenues: |  |  |  |
Total cost of revenues | 219,311 | 226,445 | 747,522 | 662,985
Services [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues | 60,897 | 57,376 | 181,636 | 161,031
Cost of revenues: |  |  |  |
Total cost of revenues | $ 35,981 | 31,827 | $ 97,453 | 88,067
As Previously Reported [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues |  | 486,267 |  | 1,404,177
Cost of revenues: |  |  |  |
Total cost of revenues |  | 258,272 |  | 751,052
As Previously Reported [Member] | Products [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues |  | 434,710 |  | 1,259,582
Cost of revenues: |  |  |  |
Total cost of revenues |  | 225,174 |  | 659,538
As Previously Reported [Member] | Services [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues |  | 51,557 |  | 144,595
Cost of revenues: |  |  |  |
Total cost of revenues |  | 33,098 |  | 91,514
Adjustment [Member] | Products [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues |  | (5,819) |  | (16,436)
Cost of revenues: |  |  |  |
Total cost of revenues |  | 1,271 |  | 3,447
Adjustment [Member] | Services [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues |  | 5,819 |  | 16,436
Cost of revenues: |  |  |  |
Total cost of revenues |  | $ (1,271) |  | $ (3,447)

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