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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