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Basis of Presentation - Revised Presentation of Previously Issued Financial Statements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net revenues: |  |  |  |
Total net revenues | $ 573,140 | $ 480,757 | $ 1,127,415 | $ 917,910
Cost of revenues: |  |  |  |
Total cost of revenues | 298,263 | 261,174 | 589,683 | 492,780
Products [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues | 509,999 | 426,317 | 1,006,676 | 814,255
Cost of revenues: |  |  |  |
Total cost of revenues | 266,890 | 230,706 | 528,211 | 436,540
Services [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues | 63,141 | 54,440 | 120,739 | 103,655
Cost of revenues: |  |  |  |
Total cost of revenues | $ 31,373 | 30,468 | $ 61,472 | 56,240
As Previously Reported [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues |  | 480,757 |  | 917,910
Cost of revenues: |  |  |  |
Total cost of revenues |  | 261,174 |  | 492,780
As Previously Reported [Member] | Products [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues |  | 431,950 |  | 824,872
Cost of revenues: |  |  |  |
Total cost of revenues |  | 229,304 |  | 434,364
As Previously Reported [Member] | Services [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues |  | 48,807 |  | 93,038
Cost of revenues: |  |  |  |
Total cost of revenues |  | 31,870 |  | 58,416
Adjustment [Member] | Products [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues |  | (5,633) |  | (10,617)
Cost of revenues: |  |  |  |
Total cost of revenues |  | 1,402 |  | 2,176
Adjustment [Member] | Services [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues |  | 5,633 |  | 10,617
Cost of revenues: |  |  |  |
Total cost of revenues |  | $ (1,402) |  | $ (2,176)

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