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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, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 4,047,539 $ 3,612,000
Goodwill acquired 57,300 441,200
Purchase price allocation adjustments and other 74,600 (14,500)
Foreign currency translation adjustments 45,500 8,800
Goodwill, ending balance 4,224,906 4,047,539
EIG    
Goodwill [Roll Forward]    
Goodwill, beginning balance 2,892,200 2,452,000
Goodwill acquired 57,300 398,900
Purchase price allocation adjustments and other 74,600 35,500
Foreign currency translation adjustments 26,200 5,800
Goodwill, ending balance 3,050,300 2,892,200
EMG    
Goodwill [Roll Forward]    
Goodwill, beginning balance 1,155,300 1,160,000
Goodwill acquired 0 42,300
Purchase price allocation adjustments and other 0 (50,000)
Foreign currency translation adjustments 19,300 3,000
Goodwill, ending balance $ 1,174,600 $ 1,155,300