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Discontinued Operations - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 06, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of business |  |  | $ 743,178 | $ 0 | $ 838 |
Gain on sale of discontinued operations, net of tax |  |  | 233,824 | 0 | 0 |
Goodwill impairment |  |  | 92,942 | $ 0 | $ 182,542 |
Life Sciences |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Goodwill impairment |  | $ 146,800 |  |  |  |
Senior Secured And Incremental Term Loans |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Repayments of debt | $ 700,000 |  |  |  |  |
Discontinued Operations, Disposed of by Sale | Life Sciences |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Aggregate purchase price of the stock purchase plan |  |  | 753,300 |  |  | $ 825,000
Cash proceeds |  |  |  |  |  | 755,000
Potential earnout payment |  |  |  |  |  | $ 70,000
Proceeds from sale of business | $ 757,200 |  |  |  |  |
Disposal group payables |  |  | 3,900 |  |  |
Gain on sale of discontinued operations, net of tax |  |  | $ 214,900 |  |  |
Support services period |  |  | 180 days |  |  |
Estimated tax indemnification |  |  | $ 1,200 |  |  |

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