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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue | $ 580,752 | $ 508,940 | $ 1,118,408 | $ 970,961
Total cost of revenue | 248,313 | 216,225 | 482,870 | 420,055
Gross profit | 332,439 | 292,715 | 635,538 | 550,906
Income from operations | 145,594 | 122,564 | 258,638 | 214,807
Interest expense | (8,457) | (9,155) | (17,731) | (17,744)
Interest income | 172 | 1,176 | 751 | 2,259
Income before provision for income taxes | 137,309 | 114,585 | 241,658 | 199,322
Provision for income taxes | 28,629 | 29,178 | 43,502 | 44,857
Net income | 108,680 | $ 85,407 | 198,156 | $ 154,465
Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue | 580,752 |  | 1,118,408 |
Total cost of revenue | 248,313 |  | 482,870 |
Gross profit | 332,439 |  | 635,538 |
Total operating expense | 186,845 |  | 376,900 |
Income from operations | 145,594 |  | 258,638 |
Interest expense | (8,457) |  | (17,731) |
Interest income | 172 |  | 751 |
Income before provision for income taxes | 137,309 |  | 241,658 |
Provision for income taxes | 28,629 |  | 43,502 |
Net income | 108,680 |  | 198,156 |
Previous U.S. GAAP | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue | 565,879 |  | 1,091,248 |
Total cost of revenue | 239,491 |  | 467,456 |
Gross profit | 326,388 |  | 623,792 |
Total operating expense | 187,321 |  | 377,947 |
Income from operations | 139,067 |  | 245,845 |
Interest expense | (8,457) |  | (17,731) |
Interest income | 437 |  | 1,299 |
Income before provision for income taxes | 131,047 |  | 229,413 |
Provision for income taxes | 27,107 |  | 40,536 |
Net income | 103,940 |  | 188,877 |
Attributed to the New Revenue Standard | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue | 14,873 |  | 27,160 |
Total cost of revenue | 8,822 |  | 15,414 |
Gross profit | 6,051 |  | 11,746 |
Total operating expense | (476) |  | (1,047) |
Income from operations | 6,527 |  | 12,793 |
Interest expense | 0 |  | 0 |
Interest income | (265) |  | (548) |
Income before provision for income taxes | 6,262 |  | 12,245 |
Provision for income taxes | 1,522 |  | 2,966 |
Net income | $ 4,740 |  | $ 9,279 |

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