Quarterly report pursuant to Section 13 or 15(d)

Equity (Detail)

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Equity (Detail)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
units
shares
Mar. 31, 2024
$ / shares
shares
Mar. 31, 2023
shares
Dec. 31, 2023
$ / shares
shares
Class of Stock [Line Items]        
Exchange ratio   1    
Common Class A        
Class of Stock [Line Items]        
Common stock, shares issued (in shares)   100,820,259   100,599,241
Common stock, shares outstanding (in shares)   96,561,759   96,340,741
Common stock shares outstanding unvested portion (in shares)   4,258,500    
Stocks delivered   14,913 98,424  
Class B share retirement (in shares)   139,730 292,360  
Common stock, par value (in dollars per share) | $ / shares   $ 0.0001   $ 0.0001
Class A LLC Units        
Class of Stock [Line Items]        
Stocks delivered   88,289 582,698  
Common Class B        
Class of Stock [Line Items]        
Common stock, shares issued (in shares)   15   15
Common stock, shares outstanding (in shares)   15   15
Common stock, par value (in dollars per share) | $ / shares   $ 0.0001   $ 0.0001
Common Class B | American Advisors Group (AAG)        
Class of Stock [Line Items]        
Shares issued at closing of transaction 1      
Capital Unit, Class A        
Class of Stock [Line Items]        
Common stock, shares issued (in shares)   100,820,259    
Conversion of stock, shares converted (in shares)   618 3,601  
Class A LLC Units        
Class of Stock [Line Items]        
Common units outstanding (in shares)   229,443,668    
Class A LLC Units | American Advisors Group (AAG)        
Class of Stock [Line Items]        
Shares issued at closing of transaction 19,692,990      
Contingent equity consideration, number of types | units 2      
Class A LLC Units | Noncontrolling Interest        
Class of Stock [Line Items]        
Common units outstanding (in shares)   132,881,909    
Class A LLC Units | Noncontrolling Interest | American Advisors Group (AAG)        
Class of Stock [Line Items]        
Conversion of stock, shares converted (in shares)       8,000,000
Class A LLC Units | Class A Common Stock Shareholders        
Class of Stock [Line Items]        
Common units outstanding (in shares)   96,561,759    
Class A LLC Units, Equity Classified, Indemnity Holdback | American Advisors Group (AAG)        
Class of Stock [Line Items]        
Contingent equity consideration (in shares) 7,142,260      
Class A LLC Units, Liability Classified | American Advisors Group (AAG)        
Class of Stock [Line Items]        
Contingent equity consideration (in shares) 7,058,416