Quarterly report [Sections 13 or 15(d)]

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.26.1
Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Billions
 3 Months Ended 12 Months Ended
Aug. 16, 2024
USD ($)
Mar. 31, 2026
USD ($)
Unit
Segment
shares
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Unit
Mar. 31, 2026
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        
Treasury stock, aggregate price   $ 52,316,000   $ 50,426,000      
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          
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   0.05%          
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   0.01%          
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        
Class A Common Stock              
Summary Of Significant Accounting Policies [Line Items]              
Treasury stock, purchased | shares   119,101          
Common stock, voting rights   one vote for each share          
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   1,656,879          
Treasury stock, aggregate price   $ 24,999,000          
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   65.00%     65.00%   65.00%
Common stock, voting rights   one vote for each share