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Business Segment, Geographic Area, Product Information 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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  | $ 216,282 | $ 205,004 | $ 211,027 | $ 198,118 | $ 209,884 | $ 231,860 | $ 274,877 | $ 262,855 | $ 830,431 | $ 979,476 | $ 891,451
Research and development |  |  |  |  |  |  |  |  |  | 164,061 | 135,720 | 132,555
Selling, general and administrative |  |  |  |  |  |  |  |  |  | 330,346 | 298,118 | 290,056
Acquisition and integration costs |  |  |  |  |  |  |  |  |  | 37,262 | 3,113 | 5,332
Restructuring and other |  |  |  |  |  |  |  |  |  | 6,983 | 4,567 | 3,920
Fees and expenses related to repricing of term loan |  |  |  |  |  |  |  |  |  | 6,637 | 378 | 492
Amortization of intangible assets |  |  |  |  |  |  |  |  |  | 67,402 | 43,521 | 45,743
Gain on sale of long-lived assets |  |  |  |  |  |  |  |  |  | (6,773) |  |
Asset impairment |  |  |  |  |  |  |  |  |  | 4,662 |  | 6,719
Income from operations |  | 66,063 | 66,820 | 63,902 | 23,066 | 94,084 | 117,045 | 151,291 | 131,639 | 219,851 | 494,059 | 406,634
Interest income |  |  |  |  |  |  |  |  |  | 5,453 | 5,775 | 3,021
Interest Expense |  |  |  |  |  |  |  |  |  | 44,135 | 16,942 | 30,990
Gain on sale of business | $ 74,856 |  |  |  |  |  |  |  |  |  |  | 74,856
Other expense, net |  |  |  |  |  |  |  |  |  | 3,333 | 1,942 | 5,896
Income from operations before income taxes |  |  |  |  |  |  |  |  |  | 177,836 | 480,950 | 447,625
Provision for income taxes |  |  |  |  |  |  |  |  |  | 37,450 | 88,054 | 108,493
Net income |  | $ 42,764 | $ 47,428 | $ 37,739 | $ 12,455 | $ 71,636 | $ 93,277 | $ 122,862 | $ 105,121 | 140,386 | 392,896 | 339,132
Vacuum & Analysis [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |  | 426,464 | 577,552 | 551,078
Light & Motion [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |  | 336,764 | $ 401,924 | $ 340,373
Equipment & Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |  | $ 67,203 |  |

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