Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 10,026	$ 11,020	$ 10,963	$ 17,749
Other Comprehensive Income (Loss), Net of Tax — Currency Translation Adjustment	(1,228)	(1,231)	33	(462)
Comprehensive Income	8,798	9,789	10,996	17,287
Comprehensive Income Attributable to Non- Controlling Interests	4,620	3,476	5,057	5,334
Comprehensive Income Attributable to PJT Partners Inc.	$ 4,178	$ 6,313	$ 5,939	$ 11,953