Quarterly report pursuant to Section 13 or 15(d)

Merger and Acquisition Activity - Additional Information (Detail)

v3.22.1
Merger and Acquisition Activity - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 01, 2021
Mar. 31, 2022
Dec. 31, 2021
Business Acquisition, Contingent Consideration [Line Items]      
Maximum contingent consideration obligation   $ 86.2 $ 129.2
Accounts Payable and Accrued Liabilities [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Business combination contingent consideration fair value current   15.1 14.4
Other Non-Current Liabilities [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Business combination contingent consideration fair value non current   26.3 27.6
Crouse And Associates Insurance Brokers Inc [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Total Consideration $ 110.6    
Increase in assumed liability   1.3  
Consideration transferred   3.8  
Increase in goodwill   $ 5.1  
Keystone Risk Partners Llc [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Business combination assets acquired     $ 59.8