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Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Goodwill [Line Items]  
Goodwill, Written off Related to Sale of Business Unit $ 1,004
Goodwill [Roll Forward]  
Beginning balance 2,716,079
Goodwill of acquired businesses 214,559
Ending balance $ 2,929,634
Document Period End Date Sep. 30, 2018
Services  
Goodwill [Line Items]  
Goodwill, Written off Related to Sale of Business Unit $ 0
Goodwill [Roll Forward]  
Beginning balance 1,386,248
Goodwill of acquired businesses 173,025
Ending balance 1,559,273
National Programs  
Goodwill [Line Items]  
Goodwill, Written off Related to Sale of Business Unit 1,004
Goodwill [Roll Forward]  
Beginning balance 908,472
Goodwill of acquired businesses 18,737
Ending balance 926,205
Wholesale Brokerage  
Goodwill [Line Items]  
Goodwill, Written off Related to Sale of Business Unit 0
Goodwill [Roll Forward]  
Beginning balance 286,098
Goodwill of acquired businesses 5,524
Ending balance 291,622
Services  
Goodwill [Line Items]  
Goodwill, Written off Related to Sale of Business Unit 0
Goodwill [Roll Forward]  
Beginning balance 135,261
Goodwill of acquired businesses 17,273
Ending balance $ 152,534