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Basis of Presentation - Revised Presentation of Previously Issued Financial Statements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Revenues: |  |  |  |  |  |  |  |  |  |  |
Total net revenues | $ 460,541 | $ 487,152 | $ 573,140 | $ 554,275 | $ 511,800 | $ 486,267 | $ 480,757 | $ 437,153 | $ 2,075,108 | $ 1,915,977 | $ 1,295,342
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  | 1,095,632 | 1,024,526 | 729,723
Products [Member] |  |  |  |  |  |  |  |  |  |  |
Net Revenues: |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 1,835,202 | 1,701,301 | 1,118,579
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  | 969,288 | 906,369 | 630,208
Services [Member] |  |  |  |  |  |  |  |  |  |  |
Net Revenues: |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 239,906 | 214,676 | 176,763
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  | $ 126,344 | 118,157 | 99,515
As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Net Revenues: |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  |  | 1,915,977 | 1,295,342
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  |  | 1,024,526 | 729,723
As Previously Reported [Member] | Products [Member] |  |  |  |  |  |  |  |  |  |  |
Net Revenues: |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  |  | 1,723,433 | 1,134,013
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  |  | 901,546 | 627,850
As Previously Reported [Member] | Services [Member] |  |  |  |  |  |  |  |  |  |  |
Net Revenues: |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  |  | 192,544 | 161,329
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  |  | 122,980 | 101,873
Adjustment [Member] | Products [Member] |  |  |  |  |  |  |  |  |  |  |
Net Revenues: |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  |  | (22,132) | (15,434)
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  |  | 4,823 | 2,358
Adjustment [Member] | Services [Member] |  |  |  |  |  |  |  |  |  |  |
Net Revenues: |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  |  | 22,132 | 15,434
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  |  | $ (4,823) | $ (2,358)

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