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Accounting Policies (Comparison of Reported Condensed Consolidated Statement of Operations to the Pro-forma Amounts had the Previous U.S. GAAP Guidance been in Effect) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue | $ 545,448 | $ 491,976 | $ 1,663,856 | $ 1,462,937
Total cost of revenue | 239,805 | 217,974 | 722,675 | 638,029
Gross profit | 305,643 | 274,002 | 941,181 | 824,908
Total operating expense | 188,293 |  | 565,193 |
Income from operations | 117,350 | 100,413 | 375,988 | 315,220
Interest expense | (8,453) | (9,764) | (26,184) | (27,508)
Interest income | 142 | 1,400 | 893 | 3,659
Income before provision for income taxes | 109,039 | 92,049 | 350,697 | 291,371
Provision for income taxes | 15,825 | 21,535 | 59,327 | 66,392
Net income | 93,214 | $ 70,514 | 291,370 | $ 224,979
Previous U.S. GAAP |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue | 531,525 |  | 1,622,773 |
Total cost of revenue | 231,277 |  | 698,733 |
Gross profit | 300,248 |  | 924,040 |
Total operating expense | 188,725 |  | 566,672 |
Income from operations | 111,523 |  | 357,368 |
Interest expense | (8,453) |  | (26,184) |
Interest income | 394 |  | 1,693 |
Income before provision for income taxes | 103,464 |  | 332,877 |
Provision for income taxes | 14,642 |  | 55,178 |
Net income | 88,822 |  | 277,699 |
Attributed to the New Revenue Standard | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue | 13,923 |  | 41,083 |
Total cost of revenue | 8,528 |  | 23,942 |
Gross profit | 5,395 |  | 17,141 |
Total operating expense | (432) |  | (1,479) |
Income from operations | 5,827 |  | 18,620 |
Interest expense | 0 |  | 0 |
Interest income | (252) |  | (800) |
Income before provision for income taxes | 5,575 |  | 17,820 |
Provision for income taxes | 1,183 |  | 4,149 |
Net income | $ 4,392 |  | $ 13,671 |

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