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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gross profit | $ 211,027 |  | $ 274,877 |  | $ 409,145 | $ 537,732
Research and development | 41,855 |  | 36,504 |  | 80,788 | 71,361
Selling, general and administrative | 83,236 |  | 76,181 |  | 165,691 | 159,130
Fees and expenses related to term loan |  |  | 378 |  | 5,847 | 378
Acquisition and integration costs | 3,240 |  | (1,168) |  | 33,407 | (1,168)
Restructuring and other | 1,242 |  | 790 |  | 3,165 | 3,010
Amortization of intangible assets | 17,552 |  | 10,901 |  | 33,279 | 22,091
Income from operations | 63,902 |  | 151,291 |  | 86,968 | 282,930
Interest and other expense, net | 12,039 |  | 2,747 |  | 19,769 | 7,644
Income before income taxes | 51,863 |  | 148,544 |  | 67,199 | 275,286
Provision for income taxes | 14,124 |  | 25,682 |  | 17,005 | 47,303
Net income | 37,739 | $ 12,455 | 122,862 | $ 105,121 | 50,194 | 227,983
Vacuum & Analysis [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gross profit | 102,095 |  | 171,082 |  | 200,234 | 329,582
Light & Motion [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gross profit | 84,948 |  | $ 103,795 |  | 177,689 | $ 208,150
Equipment & Solutions [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gross profit | $ 23,984 |  |  |  | $ 31,222 |

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