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

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.25.0.1
Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Billions
 1 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
shares
Nov. 30, 2024
shares
Oct. 31, 2024
shares
Sep. 30, 2024
shares
Aug. 31, 2024
shares
Dec. 31, 2024
USD ($)
Segment
Unit
shares
Dec. 31, 2023
USD ($)
Unit
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2024
AUD ($)
Aug. 16, 2024
USD ($)
Jul. 29, 2021
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 $ 19,728,000         $ 19,728,000 15,057,000          
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        
Class A Common Stock                        
Summary Of Significant Accounting Policies [Line Items]                        
Treasury stock, purchased | shares 71,683 61,064 50,400 60,600 22,077              
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           265,824 808,455          
Treasury stock, aggregate price $ 4,625,000         $ 4,625,000 $ 15,057,000          
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 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 67.30%         67.30% 67.10%   67.30%     68.30%
Common stock, voting rights           one vote for each share