Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.3.1.900
Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
Segment
Unit
Dec. 31, 2014
USD ($)
Unit
Dec. 31, 2013
USD ($)
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
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Identifiable finite-lived intangible assets, useful life 3 years    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Identifiable finite-lived intangible assets, useful life 20 years    
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
Class A Common Stock      
Summary Of Significant Accounting Policies [Line Items]      
Common stock, voting rights 1 vote per share    
Class B Common Stock      
Summary Of Significant Accounting Policies [Line Items]      
Common stock, voting rights 1 vote per share    
Class of share exchangeable to another class One share of Class A common stock    
Silvercrest L.P | Class A Common Stock      
Summary Of Significant Accounting Policies [Line Items]      
Ownership percentage in a subsidiary 63.00% 63.00%  
Common stock, voting rights 1 vote per share