Stockholder's Equity (Deficit) - Additional Information (Details)	Oct. 02, 2015 Vote shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares
PJT Partners Holdings LP
Class Of Stock [Line Items]
Voting power		100.00%
Non-controlling interest percentage		46.60%	47.10%
PJT Partners Holdings LP | Maximum
Class Of Stock [Line Items]
Economic interest		100.00%
Class A Common Stock
Class Of Stock [Line Items]
Common Stock, Shares Issued | shares	17,966,456	18,003,272	17,966,456
Common stock, voting rights, votes per share | Vote	1
Class B Common Stock
Class Of Stock [Line Items]
Common Stock, Shares Issued | shares	300	271	300
Common stock, voting rights, votes per share | Vote	1