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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
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Gross profit | $ 198,118 | $ 262,855
Research and development | 38,933 | 34,857
Selling, general and administrative | 82,455 | 82,949
Fees and expenses related to incremental term loan | 5,847 |
Acquisition and integration costs | 30,167 |
Restructuring | 223 | 1,220
Customer contract obligation | 1,700 |
Environmental costs |  | 1,000
Amortization of intangible assets | 15,727 | 11,190
Income from operations | 23,066 | 131,639
Interest and other expense, net | 7,730 | 4,897
Income before income taxes | 15,336 | 126,742
Provision for income taxes | 2,881 | 21,621
Net income | 12,455 | 105,121
Vacuum & Analysis [Member] |  |
Segment Reporting Information [Line Items] |  |
Gross profit | 98,139 | 158,500
Light & Motion [Member] |  |
Segment Reporting Information [Line Items] |  |
Gross profit | 92,741 | $ 104,355
Equipment & Solutions [Member] |  |
Segment Reporting Information [Line Items] |  |
Gross profit | $ 7,238 |

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