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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Total revenue | $ 537,656 | $ 462,021
Total cost of revenue | 234,557 | 203,830
Gross profit | 303,099 | 258,191
Income from operations | 113,044 | 92,243
Interest expense | (9,274) | (8,589)
Interest income | 579 | 1,083
Income before provision for income taxes | 104,349 | 84,737
Provision for income taxes | 14,873 | 15,679
Net income | 89,476 | $ 69,058
Accounting Standards Update 2014-09 [Member] |  |
Total revenue | 537,656 |
Total cost of revenue | 234,557 |
Gross profit | 303,099 |
Total operating expense | 190,055 |
Income from operations | 113,044 |
Interest expense | (9,274) |
Interest income | 579 |
Income before provision for income taxes | 104,349 |
Provision for income taxes | 14,873 |
Net income | 89,476 |
Attributed to the New Revenue Standard [Member] | Accounting Standards Update 2014-09 [Member] |  |
Total revenue | 12,287 |
Total cost of revenue | 6,592 |
Gross profit | 5,695 |
Total operating expense | (571) |
Income from operations | 6,266 |
Interest income | (283) |
Income before provision for income taxes | 5,983 |
Provision for income taxes | 1,444 |
Net income | 4,539 |
Previous U.S. GAAP (Reported) [Member] | Accounting Standards Update 2014-09 [Member] |  |
Total revenue | 525,369 |
Total cost of revenue | 227,965 |
Gross profit | 297,404 |
Total operating expense | 190,626 |
Income from operations | 106,778 |
Interest expense | (9,274) |
Interest income | 862 |
Income before provision for income taxes | 98,366 |
Provision for income taxes | 13,429 |
Net income | $ 84,937 |

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