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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