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Business Segment, Geographic Area, Product and Significant Customer Information - Schedule of Capital Expenditures, Depreciation and Amortization Expense of Intangible Assets by Reportable Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | $ 13,725 | $ 12,428 | $ 28,254 | $ 21,818
Depreciation and amortization | 27,444 | 19,885 | 52,655 | 40,377
Vacuum & Analysis [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | 6,700 | 6,972 | 14,188 | 13,169
Depreciation and amortization | 3,941 | 4,968 | 7,986 | 10,097
Light & Motion [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | 4,938 | 5,456 | 10,092 | 8,649
Depreciation and amortization | 13,292 | $ 14,917 | 27,432 | $ 30,280
Equipment & Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | 2,087 |  | 3,974 |
Depreciation and amortization | $ 10,211 |  | $ 17,237 |

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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