Annual report pursuant to Section 13 and 15(d)

Mergers and Acquisitions - Additional Information (Details)

v3.25.0.1
Mergers and Acquisitions - Additional Information (Details)
$ in Thousands
 12 Months Ended
Nov. 04, 2024
USD ($)
managing_general_underwriter
Oct. 01, 2024
USD ($)
Sep. 13, 2024
USD ($)
program
Sep. 01, 2024
USD ($)
Aug. 30, 2024
USD ($)
May 01, 2024
USD ($)
Dec. 01, 2023
USD ($)
Jul. 03, 2023
USD ($)
Jul. 01, 2023
USD ($)
Jan. 03, 2023
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Business Acquisition Contingent Consideration [Line Items]                          
Measurement period adjustments increase (decrease), goodwill                     $ 4,744    
Contingent consideration                       $ 8,100  
Estimated tax deductible goodwill                     735,800    
Revenue                     102,800    
Contingent consideration increase (decrease)                     (22,859) 5,421 $ 442
Incremental amortization expense on intangible assets acquired                     77,000 146,400  
Increase (decrease) in transaction costs                     (24,000) 8,400  
Incremental financing costs and interest expense                     20,600 99,000  
Increase (decrease) in income tax expense                     (9,500) 9,500  
Reduction in tax expenses                     8,400 26,200  
Maximum contingent consideration obligation                     563,100    
Maximum returnable consideration                     18,800    
General and Administrative Expense                          
Business Acquisition Contingent Consideration [Line Items]                          
Business combination, acquisition related costs                     19,100 $ 7,100  
2024 Acquisitions                          
Business Acquisition Contingent Consideration [Line Items]                          
Contingent consideration, asset                     4,900    
Contingent consideration                     103,800    
Castel                          
Business Acquisition Contingent Consideration [Line Items]                          
Cash consideration           $ 247,600              
Contingent consideration, asset           4,900              
Measurement period adjustments, deferred tax liabilities                     1,600    
Measurement period adjustments, taxes payable                     900    
Measurement period adjustments increase (decrease) for working capital                     (500)    
Measurement period adjustments increase (decrease), goodwill                     (2,000)    
Castel | Class A Common Stock                          
Business Acquisition Contingent Consideration [Line Items]                          
Equity consideration for acquisition           $ 2,200              
US Assure                          
Business Acquisition Contingent Consideration [Line Items]                          
Cash consideration         $ 1,079,800                
Measurement period adjustments increase (decrease), goodwill                     5,200    
Contingent consideration         $ 103,800                
Greenhill                          
Business Acquisition Contingent Consideration [Line Items]                          
Cash consideration       $ 11,700                  
Measurement period adjustments increase (decrease) for working capital                     400    
Measurement period adjustments increase (decrease), goodwill                     300    
Measurement period adjustments, intangibles                     100    
Ethos P&C                          
Business Acquisition Contingent Consideration [Line Items]                          
Cash consideration     $ 44,000                    
Number of underwriting programs for insurance carriers | program     8                    
EverSports                          
Business Acquisition Contingent Consideration [Line Items]                          
Cash consideration   $ 43,100                      
Innovisk                          
Business Acquisition Contingent Consideration [Line Items]                          
Cash consideration $ 426,800                        
Number of managing general underwriters | managing_general_underwriter 7                        
Griffin                          
Business Acquisition Contingent Consideration [Line Items]                          
Cash consideration                   $ 115,500      
ACE Benefit Partners & Point6 Healthcare                          
Business Acquisition Contingent Consideration [Line Items]                          
Cash consideration                 $ 46,800        
Measurement period adjustments increase (decrease), goodwill                     600    
Contingent consideration increase (decrease)                 $ 2,300        
Socius Insurance Services                          
Business Acquisition Contingent Consideration [Line Items]                          
Cash consideration               $ 253,500          
Contingent consideration increase (decrease)               5,800          
Socius Insurance Services | Class A Common Stock                          
Business Acquisition Contingent Consideration [Line Items]                          
Equity consideration for acquisition               $ 2,700          
AccuRisk Holdings                          
Business Acquisition Contingent Consideration [Line Items]                          
Cash consideration             $ 98,300            
Contingent consideration increase (decrease)                     (300)    
Measurement period adjustments, deferred tax assets                     $ 400