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Equity-Based Compensation - Additional Information (Details)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share price one achieved $ 48
Share price two achieved $ 55
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
Restricted Stock Units  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Estimated unrecognized compensation expense related to unvested awards | $ $ 90.4
Weighted-average period for recognition of compensation expense related to unvested awards 1 year 2 months 12 days
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%
Partnership Units  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Estimated unrecognized compensation expense related to unvested awards | $ $ 39.6
Assumed forfeiture rate 4.00%
Weighted-average period for recognition of compensation expense related to unvested awards 8 months 12 days
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
Service and Market Conditions  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Estimated unrecognized compensation expense related to unvested awards | $ $ 7.3
Assumed forfeiture rate 4.00%
Weighted-average period for recognition of compensation expense related to unvested awards 1 year
Equity-based awards service condition requirement 5 years
Weighted-average share price targets on consecutive trading period 30 days
Consummation spin-off price one $ 48
Consummation spin-off price two 55
Consummation spin-off price three 63
Consummation spin-off price four 71
Consummation spin-off price five $ 79
Service and Market Conditions | Period Three  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Equity-based awards vesting percentage with service condition 20.00%
Service and Market Conditions | Period Four  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Equity-based awards vesting percentage with service condition 30.00%
Service and Market Conditions | Period Five  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Equity-based awards vesting percentage with service condition 50.00%