Quarterly report pursuant to Section 13 or 15(d)

Related Parties - Additional Information (Detail)

v3.21.2
Related Parties - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Apr. 30, 2021
Mar. 31, 2021
Jan. 01, 2021
Mar. 05, 2020
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Jun. 13, 2019
Related Party Transaction [Line Items]                  
Total invested capital         $ 46,911,000 $ 46,911,000   $ 47,216,000  
Expense related to business usage of the aircraft           300,000 $ 200,000    
Financial obligations $ 10,000,000.0                
Ryan Re Services Agreement With Geneva Re And Nationwide [Member]                  
Related Party Transaction [Line Items]                  
Percentage of service fee arrived     115.00%            
Percentage of service fee, written off     2.50%         2.50%  
Revenue earned from Geneva Re           900,000 $ 900,000    
Receivables due from Geneva Re         3,300,000 3,300,000   $ 3,000,000.0  
Parent Company [Member]                  
Related Party Transaction [Line Items]                  
Due to affiliate         590 590      
RSG LLC [Member] | Parent Company [Member]                  
Related Party Transaction [Line Items]                  
Reimbursement received, Related party transaction         25,000 25,000      
Due to affiliate         590 590      
JEM Underwriting Managers, LLC [Member]                  
Related Party Transaction [Line Items]                  
Total consideration transferred, net of cash acquired     $ 4,000,000.0            
Ryan Specialty Group, LLC [Member]                  
Related Party Transaction [Line Items]                  
Total consideration transferred, net of cash acquired   $ 48,400,000              
Equity Method Investment, Ownership Percentage   53.00%             47.00%
Common stock, Par value   $ 1             $ 1
Shares Issued, Price Per Share                 $ 4.70
Derecognized the non-controlling interest         3,700,000        
Recognized a deemed distribution         44,600,000        
Working capital true-up payment         100,000        
Geneva Ryan Holdings [Member]                  
Related Party Transaction [Line Items]                  
Equity Method Investment, Ownership Percentage                 53.00%
Ryan Investment Holdings [Member]                  
Related Party Transaction [Line Items]                  
Total invested capital         $ 47,000,000.0 $ 47,000,000.0      
Ryan Investment Holdings [Member] | Ryan Specialty Group, LLC [Member]                  
Related Party Transaction [Line Items]                  
Equity Method Investment, Ownership Percentage         47.00% 47.00%      
Ryan Investment Holdings [Member] | Geneva Ryan Holdings [Member]                  
Related Party Transaction [Line Items]                  
Equity Method Investment, Ownership Percentage         53.00% 53.00%      
Geneva Re Partners, LLC [Member] | Ryan Investment Holdings [Member]                  
Related Party Transaction [Line Items]                  
Non-controlling Interest, Ownership Percentage by Non-controlling Owners         50.00% 50.00%      
Ryan Re [Member]                  
Related Party Transaction [Line Items]                  
Equity Method Investment, Ownership Percentage         53.00% 53.00%      
Geneva Re [Member]                  
Related Party Transaction [Line Items]                  
Equity Method Investment, Ownership Percentage         50.00% 50.00%      
Total invested capital         $ 47,000,000.0 $ 47,000,000.0      
Equity Method Investment, Aggregate Cost         50,000,000.0 50,000,000.0      
Capital contribution       $ 23,500,000          
Due to related parties         $ 1,000,000.0 1,000,000.0   $ 400,000  
Related Party Costs           $ 600,000