Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.22.2.2
Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
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Aug. 31, 2022
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Sep. 30, 2022
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Sep. 30, 2021
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Sep. 30, 2022
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Sep. 30, 2021
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Dec. 31, 2021
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Jul. 29, 2021
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Jun. 26, 2013
Summary Of Significant Accounting Policies [Line Items]                  
Number of operating segment | Segment         1        
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     5,240,000 418,000          
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   $ 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   $ 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   $ 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   $ 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   $ 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   $ 50,000,000        
Minimum                  
Summary Of Significant Accounting Policies [Line Items]                  
Identifiable finite-lived intangible assets, useful life         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        
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        
Other Fixed Assets | Minimum                  
Summary Of Significant Accounting Policies [Line Items]                  
Property, plant and equipment, useful life         3 years        
Other Fixed Assets | Maximum                  
Summary Of Significant Accounting Policies [Line Items]                  
Property, plant and equipment, useful life         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 136,930 148,579     318,592   33,083    
Treasury stock, aggregate price         $ 5,752,000   $ 512,000    
Common stock, voting rights         one vote for each share        
Class A Common Stock | Maximum                  
Summary Of Significant Accounting Policies [Line Items]                  
Stock repurchase program, authorized amount               $ 15,000,000  
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 67.90%   67.90%   67.90%       67.90%
Common stock, voting rights         one vote for each share