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Equity-Based and Other Deferred Compensation - Additional Information (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 01, 2018
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Oct. 01, 2015
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share price one achieved | $ / shares     $ 48  
Share price two achieved | $ / shares     $ 55  
Restricted Stock Units        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Estimated unrecognized compensation expense related to unvested awards | $   $ 90.5    
Weighted-average period for recognition of compensation expense related to unvested awards   10 months 24 days    
Granted   2,042,990    
Vested   1,844,158    
Forfeited   337,095    
Restricted Stock Units | PJT Partners Holdings LP        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vested   73,908    
Forfeited   6,085    
Restricted Stock Units | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   3 years    
Assumed forfeiture rate   1.00%    
Restricted Stock Units | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   5 years    
Assumed forfeiture rate   9.00%    
RSU Awards Containing Service and Market Conditions        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted   25,158    
Forfeited   15,968    
RSU Awards Containing Service and Market Conditions | CamberView        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Estimated unrecognized compensation expense related to unvested awards | $   $ 4.1    
Weighted-average period for recognition of compensation expense related to unvested awards   2 years 8 months 12 days    
Awards with service condition requirement 4 years      
Awards vesting percentage with service condition 100.00%      
Weighted-average share price targets on consecutive trading period 30 days      
RSU Awards Containing Service and Market Conditions | Minimum | CamberView        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Assumed forfeiture rate   4.00%    
RSU Awards Containing Service and Market Conditions | Maximum | CamberView        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Assumed forfeiture rate   9.00%    
Partnership Units        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Estimated unrecognized compensation expense related to unvested awards | $   $ 13.4    
Assumed forfeiture rate   4.00%    
Weighted-average period for recognition of compensation expense related to unvested awards   1 year    
Granted   138,278    
Vested   2,897,789    
Partnership Units | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   3 years    
Partnership Units | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   5 years    
Partnership Unit Awards Containing Service and Market Conditions        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Estimated unrecognized compensation expense related to unvested awards | $   $ 0.1    
Assumed forfeiture rate   4.00%    
Weighted-average period for recognition of compensation expense related to unvested awards   0 years    
Awards with service condition requirement   5 years    
Weighted-average share price targets on consecutive trading period   30 days    
Vested   1,179,034    
Forfeited   132,916    
Consummation spin-off price one | $ / shares   $ 48    
Consummation spin-off price two | $ / shares   55    
Consummation spin-off price three | $ / shares   63    
Consummation spin-off price four | $ / shares   71    
Consummation spin-off price five | $ / shares   $ 79    
Partnership Unit Awards Containing Service and Market Conditions | Period Three        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Awards vesting percentage with service condition   20.00%    
Partnership Unit Awards Containing Service and Market Conditions | Period Four        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Awards vesting percentage with service condition   30.00%    
Partnership Unit Awards Containing Service and Market Conditions | Period Five        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Awards vesting percentage with service condition   50.00%    
Class A Common Stock | PJT Partners Holdings LP        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Exchange of Partnership unit to shares, number of shares per each unit   1    
Class A Common Stock | Restricted Share Awards | CamberView        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   4 years    
Estimated unrecognized compensation expense related to unvested awards | $   $ 0.3    
Weighted-average period for recognition of compensation expense related to unvested awards   1 year 9 months 18 days    
Granted   3,591 5,100  
Vested   0    
Forfeited   0    
2015 Omnibus Incentive Plan | Class A Common Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, number of shares authorized       17,000,000