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Transactions With Related Parties - Additional Information (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Aug. 06, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
Related Party Transaction [Line Items]        
Cash settled exchange of partnership units   $ 10,050 $ 30,918  
Amount due to tax receivable agreement   $ 8,916   $ 8,456
PJT Partners Holdings LP        
Related Party Transaction [Line Items]        
Exchange of partnership units settled | shares   230,325 662,146  
Percentage payment to exchanging holders of partnership units of benefits   85.00%    
PJT Partners Holdings LP | Scenario, Forecast        
Related Party Transaction [Line Items]        
Exchange of partnership units settled | shares 108,586      
Cash settled exchange of partnership units $ 4,400      
Price per partnership unit paid equal to the volume-weighted average price of share | $ / shares $ 40.72      
Class A Common Stock | PJT Partners Holdings LP        
Related Party Transaction [Line Items]        
Exchange of Partnership unit to shares, number of shares per each unit   1