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 6 Months Ended 12 Months Ended
Aug. 16, 2024
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Unit
Segment
shares
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Unit
Jun. 30, 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       he predominant GAAP measure the Company’s chief operating decision maker uses 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 $ 0        
Treasury stock, aggregate price   $ 52,316,000   $ 52,316,000   $ 50,426,000      
Accounting Standards Update [Extensible Enumeration]       us-gaap:AccountingStandardsUpdate202505Member          
Change in accounting principle, accounting standards update, Adopted   true   true     true    
Change in accounting principle, accounting standards update, Immaterial Effect   true   true     true    
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       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   $ 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   $ 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%   65.00%
Common stock, voting rights       one vote for each share