Equity-Based and Other Deferred Compensation - Unvested Units After Expected Forfeitures which are Expected to Vest (Details)	12 Months Ended
	Dec. 31, 2023 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Units expected to vest	8,030,482
Weighted-average service period of unit expected to vest (in years)	1 year 6 months
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Units expected to vest	6,447,482
Weighted-average service period of unit expected to vest (in years)	1 year 6 months
PJT Partners Holdings LP | Partnership Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Units expected to vest	1,583,000
Weighted-average service period of unit expected to vest (in years)	1 year 10 months 24 days