Quarterly report [Sections 13 or 15(d)]

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.25.2
Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Billions
 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 16, 2024
USD ($)
Jul. 29, 2021
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Segment
Unit
shares
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Unit
Dec. 31, 2023
USD ($)
shares
Jun. 30, 2025
AUD ($)
May 23, 2025
USD ($)
Jun. 26, 2013
Summary Of Significant Accounting Policies [Line Items]                      
Number of operating segment | Segment         1            
Number of reportable segment | Segment         1            
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]         srt:ChiefExecutiveOfficerMember            
Segment reporting, CODM, profit (loss) measure, description         The predominant GAAP measure monitored and reviewed by the Company’s chief operating decision maker to assess operating results and the allocation of resources is net income.            
Cash equivalents, maximum maturity period         90 days            
Equity method investments, unrealized intercompany profit (loss) not eliminated amount         $ 0            
Number of reporting unit | Unit         1   1        
Impairment charges on goodwill     $ 0 $ 0 $ 0 $ 0          
Treasury stock, aggregate price     38,866,000   $ 38,866,000   $ 19,728,000        
2021 Repurchase Program                      
Summary Of Significant Accounting Policies [Line Items]                      
Stock repurchase program, expiration period   2023-08                  
2024 Repurchase Program                      
Summary Of Significant Accounting Policies [Line Items]                      
Stock repurchase program, expiration period 2025-04                    
Equity or Balanced Portfolios                      
Summary Of Significant Accounting Policies [Line Items]                      
Percentage of asset management fee on threshold limit         1.00%            
Asset under management, threshold limit     10,000,000   $ 10,000,000            
Percentage of asset management fee on balance         0.60%            
Fixed Income Portfolios                      
Summary Of Significant Accounting Policies [Line Items]                      
Percentage of asset management fee on threshold limit         0.40%            
Asset under management, threshold limit     10,000,000   $ 10,000,000            
Percentage of asset management fee on balance         0.30%            
Cortina Equity Portfolios                      
Summary Of Significant Accounting Policies [Line Items]                      
Percentage of asset management fee on balance         0.80%            
Percentage of asset management fee on first threshold limit         1.00%            
Asset under management, first threshold limit     25,000,000   $ 25,000,000            
Percentage of asset management fee on second threshold limit         0.90%            
Asset under management, second threshold limit     25,000,000   $ 25,000,000            
Municipal Value Strategy                      
Summary Of Significant Accounting Policies [Line Items]                      
Percentage of income from asset management fee         0.65%            
Outsourced Chief Investment Officer Portfolios                      
Summary Of Significant Accounting Policies [Line Items]                      
Percentage of asset management fee on balance         0.24%            
Percentage of asset management fee on first threshold limit         0.40%            
Asset under management, first threshold limit     50,000,000   $ 50,000,000            
Percentage of asset management fee on second threshold limit         0.32%            
Asset under management, second threshold limit     $ 50,000,000   $ 50,000,000            
Global Value Equity Strategy                      
Summary Of Significant Accounting Policies [Line Items]                      
Percentage of asset management fee on first threshold limit         0.15%            
Asset under management, first threshold limit                 $ 1.5    
Percentage of asset management fee on second threshold limit         0.14%            
Asset under management, second threshold limit                 1.5    
Percentage of asset management fees on third threshold limit         0.11%            
Assets under management third threshold limit for asset management fee                 1.0    
Percentage of asset management fees on fourth threshold limit         0.08%            
Assets under management fourth threshold limit for asset management fee                 1.0    
Percentage of asset management fees above threshold limit         0.05%            
Assets under management above threshold limit for asset management fee                 $ 5.0    
Minimum                      
Summary Of Significant Accounting Policies [Line Items]                      
Identifiable finite-lived intangible assets, useful life     3 years   3 years       3 years    
Minimum | Private Funds                      
Summary Of Significant Accounting Policies [Line Items]                      
Prior written notice period to terminate investment management agreements         30 days            
Prior written notice period after receiving the affirmative vote, to terminate investment management agreements         60 days            
Percentage of income from asset management fee         0.25%            
Minimum | Non-discretionary Assets                      
Summary Of Significant Accounting Policies [Line Items]                      
Percentage of income from asset management fee         0.05%            
Maximum                      
Summary Of Significant Accounting Policies [Line Items]                      
Identifiable finite-lived intangible assets, useful life     20 years   20 years       20 years    
Maximum | Private Funds                      
Summary Of Significant Accounting Policies [Line Items]                      
Prior written notice period to terminate investment management agreements         90 days            
Prior written notice period after receiving the affirmative vote, to terminate investment management agreements         90 days            
Percentage of income from asset management fee         1.50%            
Maximum | Non-discretionary Assets                      
Summary Of Significant Accounting Policies [Line Items]                      
Percentage of income from asset management fee         0.01%            
Leasehold Improvements                      
Summary Of Significant Accounting Policies [Line Items]                      
Property, plant and equipment, useful life     10 years   10 years       10 years    
Other Fixed Assets | Minimum                      
Summary Of Significant Accounting Policies [Line Items]                      
Property, plant and equipment, useful life     3 years   3 years       3 years    
Other Fixed Assets | Maximum                      
Summary Of Significant Accounting Policies [Line Items]                      
Property, plant and equipment, useful life     7 years   7 years       7 years    
Equity Method Investments                      
Summary Of Significant Accounting Policies [Line Items]                      
Impairment charges related to equity method investments     $ 0 $ 0 $ 0 $ 0          
Class A Common Stock                      
Summary Of Significant Accounting Policies [Line Items]                      
Treasury stock, purchased | shares         1,225,833            
Common stock, voting rights         one vote for each share            
Class A Common Stock | 2021 Repurchase Program                      
Summary Of Significant Accounting Policies [Line Items]                      
Treasury stock, purchased | shares               808,455      
Treasury stock, aggregate price               $ 15,057,000      
Class A Common Stock | 2024 Repurchase Program                      
Summary Of Significant Accounting Policies [Line Items]                      
Treasury stock, purchased | shares         709,687            
Treasury stock, aggregate price     12,119,000   $ 12,119,000            
Class A Common Stock | 2025 Repurchase Program                      
Summary Of Significant Accounting Policies [Line Items]                      
Treasury stock, purchased | shares         781,970            
Treasury stock, aggregate price     $ 11,690,000   $ 11,690,000            
Class A Common Stock | Maximum | 2021 Repurchase Program                      
Summary Of Significant Accounting Policies [Line Items]                      
Stock repurchase program, authorized amount   $ 15,000,000                  
Class A Common Stock | Maximum | 2024 Repurchase Program                      
Summary Of Significant Accounting Policies [Line Items]                      
Stock repurchase program, authorized amount $ 12,000,000                    
Class A Common Stock | Maximum | 2025 Repurchase Program                      
Summary Of Significant Accounting Policies [Line Items]                      
Stock repurchase program, authorized amount                   $ 25,000,000  
Class B Common Stock                      
Summary Of Significant Accounting Policies [Line Items]                      
Common stock, voting rights         one vote for each share            
Class of share exchangeable to another class         one-for-one basis            
Silvercrest L.P | Class A Common Stock                      
Summary Of Significant Accounting Policies [Line Items]                      
Ownership percentage in a subsidiary     68.70%   68.70%       68.70%   68.70%
Common stock, voting rights         one vote for each share