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Business Acquisitions (Detail) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 02, 2020
Mar. 04, 2019
May 13, 2021
Mar. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]          
Goodwill       $ 1,386,847 $ 1,394,364
Forecast          
Business Acquisition [Line Items]          
Cash received or receivable per share from merger (in dollars per share)     $ 28.00    
Equity Interests received or receivable for merger, shares     0.0718    
Endeavor [Member]          
Business Acquisition [Line Items]          
Business Combination, Consideration Transferred   $ 385,900      
Intangible assets acquired   102,700      
Goodwill   $ 271,400      
Altavian [Member]          
Business Acquisition [Line Items]          
Business Combination, Consideration Transferred $ 34,106        
Identifiable Intangible assets 6,075        
Goodwill 22,857        
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 7,300        
Cash payment for business acquisition $ 26,800