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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 | 9 Months Ended
--- | --- | --- | ---
Apr. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Gross profit |  | $ 231,860 | $ 227,995 | $ 769,592 | $ 653,125
Research and development |  | 31,898 | 32,548 | 103,259 | 99,510
Selling, general and administrative |  | 70,822 | 71,347 | 229,952 | 217,546
Acquisition and integration costs |  | 36 | 2,466 | (1,132) | 4,698
Restructuring |  | 1,364 | 10 | 3,374 | 2,596
Asset impairment |  |  |  |  | 6,719
Fees and expenses related to repricing of term loan |  |  | 492 | 378 | 492
Environmental costs |  |  |  | 1,000 |
Amortization of intangible assets |  | 10,695 | 10,977 | 32,786 | 34,946
Income from operations |  | 117,045 | 110,155 | 399,975 | 286,618
Gain on sale of business | $ 74,856 |  |  |  | 74,856
Interest and other expense, net |  | 2,529 | 8,784 | 10,173 | 24,846
Income before income taxes |  | 114,516 | 101,371 | 389,802 | 336,628
Provision for income taxes |  | 21,239 | 25,377 | 68,542 | 75,134
Net income |  | 93,277 | 75,994 | 321,260 | 261,494
Vacuum & Analysis [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross profit |  | 132,835 | 141,438 | 462,418 | 410,228
Light & Motion [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross profit |  | $ 99,025 | $ 86,557 | $ 307,174 | $ 242,897

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