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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, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 4,224,906 $ 4,047,500
Goodwill acquired 1,043,800 57,300
Purchase price allocation adjustments and other 1,900 74,600
Foreign currency translation adjustments (31,900) 45,500
Goodwill, ending balance 5,238,726 4,224,906
EIG    
Goodwill [Roll Forward]    
Goodwill, beginning balance 3,050,300 2,892,200
Goodwill acquired 1,037,900 57,300
Purchase price allocation adjustments and other 1,900 74,600
Foreign currency translation adjustments (16,300) 26,200
Goodwill, ending balance 4,073,800 3,050,300
EMG    
Goodwill [Roll Forward]    
Goodwill, beginning balance 1,174,600 1,155,300
Goodwill acquired 5,900 0
Purchase price allocation adjustments and other 0 0
Foreign currency translation adjustments (15,600) 19,300
Goodwill, ending balance $ 1,164,900 $ 1,174,600