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Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Gross Profit to Consolidated Net Income (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2017 | 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  | $ 209,884 | $ 231,860 | $ 274,877 | $ 262,855 | $ 238,326 | $ 227,995 | $ 219,583 | $ 205,547 | $ 979,476 | $ 891,451 | $ 565,619
Research and development |  |  |  |  |  |  |  |  |  | 135,720 | 132,555 | 110,579
Selling, general and administrative |  |  |  |  |  |  |  |  |  | 298,118 | 290,056 | 227,932
Acquisition and integration costs |  |  |  |  |  |  |  |  |  | 3,113 | 5,332 | 27,279
Restructuring |  |  |  |  |  |  |  |  |  | 3,567 | 3,920 | 642
Environmental costs |  |  |  |  |  |  |  |  |  | 1,000 |  |
Asset impairment |  |  |  |  |  |  |  |  |  |  | 6,719 | 5,000
Fees and expenses related to repricing of term loan |  |  |  |  |  |  |  |  |  | 378 | 492 | 1,239
Amortization of intangible assets |  |  |  |  |  |  |  |  |  | 43,521 | 45,743 | 35,681
Income from operations |  | 94,084 | 117,045 | 151,291 | 131,639 | 120,016 | 110,155 | 92,883 | 83,580 | 494,059 | 406,634 | 157,267
Interest income |  |  |  |  |  |  |  |  |  | 5,775 | 3,021 | 2,560
Interest expense |  |  |  |  |  |  |  |  |  | 16,942 | 30,990 | 30,611
Gain on sale of business | $ 74,856 |  |  |  |  |  |  |  |  |  | 74,856 |
Other expense, net |  |  |  |  |  |  |  |  |  | 1,942 | 5,896 | 1,239
Income before income taxes |  |  |  |  |  |  |  |  |  | 480,950 | 447,625 | 127,977
Provision for income taxes |  |  |  |  |  |  |  |  |  | 88,054 | 108,493 | 23,168
Net income |  | $ 71,636 | $ 93,277 | $ 122,862 | $ 105,121 | $ 77,638 | $ 75,994 | $ 120,440 | $ 65,060 | 392,896 | 339,132 | 104,809
Vacuum & Analysis [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |  | 577,552 | 551,078 | 388,220
Light & Motion [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |  | $ 401,924 | $ 340,373 | $ 177,399

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