Quarterly report [Sections 13 or 15(d)]

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.25.1
Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Billions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Segment
Unit
shares
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Unit
Dec. 31, 2023
USD ($)
shares
Mar. 31, 2025
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 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 $ 23,634,000   $ 19,728,000          
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              
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 217,063              
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 482,887              
Treasury stock, aggregate price $ 8,577,000              
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 70.10%       70.10%     70.10%
Common stock, voting rights one vote for each share