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Acquisitions and Divestiture - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Purchases of businesses, net of cash acquired |  |  | $ 116,509 | $ 1,061,945 | $ 1,129,305
Goodwill |  |  | 4,224,906 | 4,047,539 | 3,612,000
Proceeds from sale of business |  |  | 245,311 | 0 | 0
Gain on sale of business |  | $ 141,000 | 141,020 | 0 | 0
Income tax expense relating to sale of business |  | $ 31,400 |  |  |
2020 Consolidated Acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchases of businesses, net of cash acquired | $ 116,500 |  | 116,500 |  |
Total other intangible assets acquired |  |  | 59,500 |  |
Finite-lived intangible assets acquired |  |  | 50,500 |  |
Future amortization expense, year one |  |  | 2,700 |  |
Future amortization expense, year two |  |  | 2,700 |  |
Future amortization expense, year three |  |  | 2,700 |  |
Future amortization expense, year four |  |  | 2,700 |  |
Future amortization expense, year five |  |  | 2,700 |  |
Goodwill |  |  | 57,300 |  |
2020 Consolidated Acquisition | Trade Names |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Indefinite-lived intangible trade names acquired |  |  | 9,000 |  |
2020 Consolidated Acquisition | Customer Relationship |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 38,000 |  |
2020 Consolidated Acquisition | Customer Relationship | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Amortization period for finite-lived intangible asset |  |  | 20 years |  |
2020 Consolidated Acquisition | Purchased technology |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 12,500 |  |
Amortization period for finite-lived intangible asset |  |  | 5 years |  |
2020 Consolidated Acquisition | Purchased technology | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Amortization period for finite-lived intangible asset |  |  | 15 years |  |
2019 Consolidated Acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchases of businesses, net of cash acquired |  |  |  | $ 1,061,900 |
Total other intangible assets acquired |  |  | $ 418,000 |  |
Consideration paid |  |  | 938,500 |  |
Goodwill |  |  | 472,500 |  |
Business acquisition, goodwill, expected tax deductible amount |  |  | 463,000 |  |
2019 Consolidated Acquisition | Trade Names |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Indefinite-lived intangible trade names acquired |  |  | 57,700 |  |
2019 Consolidated Acquisition | Customer Relationship |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Indefinite-lived intangible trade names acquired |  |  | 308,800 |  |
2019 Consolidated Acquisition | Purchased technology |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Indefinite-lived intangible trade names acquired |  |  | 51,500 |  |
2018 Consolidated Acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchases of businesses, net of cash acquired |  |  |  |  | $ 1,129,300
Kymera International | Reading Alloys |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from sale of business |  |  | $ 245,300 |  |

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