Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 937	$ 6,729
Other Comprehensive Income, Net of Tax — Currency Translation Adjustment	1,261	769
Comprehensive Income	2,198	7,498
Comprehensive Income Attributable to Non-Controlling Interests	437	1,858
Comprehensive Income Attributable to PJT Partners Inc.	$ 1,761	$ 5,640