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Goodwill and Other Intangible Assets - Changes in Carrying Amounts of Goodwill by Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 6,447,629 $ 5,372,600
Goodwill acquired 70,700 1,011,700
Purchase price allocation adjustments and other 92,400 24,800
Foreign currency translation adjustments (54,800) 38,500
Goodwill, ending balance 6,555,877 6,447,629
EIG    
Goodwill [Roll Forward]    
Goodwill, beginning balance 4,365,000 4,236,100
Goodwill acquired 70,700 79,300
Purchase price allocation adjustments and other 30,700 24,800
Foreign currency translation adjustments (41,500) 24,800
Goodwill, ending balance 4,424,900 4,365,000
EMG    
Goodwill [Roll Forward]    
Goodwill, beginning balance 2,082,600 1,136,500
Goodwill acquired 0 932,400
Purchase price allocation adjustments and other 61,700 0
Foreign currency translation adjustments (13,300) 13,700
Goodwill, ending balance $ 2,131,000 $ 2,082,600