Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.7.0.1
Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Segment
Unit
Mar. 31, 2016
USD ($)
Dec. 31, 2016
Unit
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    
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    
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