Annual report [Section 13 and 15(d), not S-K Item 405]

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.26.1
Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Billions
 12 Months Ended
Jul. 29, 2021
USD ($)
shares
Dec. 31, 2025
USD ($)
Unit
Segment
shares
Dec. 31, 2024
USD ($)
Unit
Dec. 31, 2023
USD ($)
Dec. 31, 2025
AUD ($)
May 23, 2025
USD ($)
Aug. 16, 2024
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 is Net Income to assess operating results and the allocation of resources.            
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        
Treasury stock, aggregate price   $ 50,426,000 19,728,000          
Accounting Standards Update [Extensible Enumeration]   us-gaap:AccountingStandardsUpdate202309Member            
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]   true     true      
2021 Repurchase Program                
Summary Of Significant Accounting Policies [Line Items]                
Stock repurchase program, expiration period 2023-08              
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            
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            
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            
Percentage of asset management fee on second threshold limit   0.90%            
Asset under management, second threshold limit   $ 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            
Percentage of asset management fee on second threshold limit   0.32%            
Asset under management, second threshold limit   $ 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      
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   0.01%            
Maximum                
Summary Of Significant Accounting Policies [Line Items]                
Identifiable finite-lived intangible assets, useful life   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   0.05%            
Leasehold Improvements                
Summary Of Significant Accounting Policies [Line Items]                
Property, plant and equipment, useful life   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      
Other Fixed Assets | Maximum                
Summary Of Significant Accounting Policies [Line Items]                
Property, plant and equipment, useful life   7 years     7 years      
Equity Method Investments                
Summary Of Significant Accounting Policies [Line Items]                
Impairment charges related to equity method investments   $ 0 $ 0 $ 0        
Class A Common Stock                
Summary Of Significant Accounting Policies [Line Items]                
Treasury stock, purchased | shares   1,981,641            
Common stock, voting rights   one vote for each share            
Class of share exchangeable to another class   one-for-one basis            
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            
Class A Common Stock | 2025 Repurchase Program                
Summary Of Significant Accounting Policies [Line Items]                
Treasury stock, purchased | shares   1,537,778            
Treasury stock, aggregate price   $ 23,127,000            
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   64.80% 67.30%   64.80%     66.00%
Common stock, voting rights   one vote for each share