Reorganization and Spin-Off - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Oct. 01, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Reorganization And Spin Off [Line Items]
Cash and Cash Equivalents	$ 152,431	$ 82,322		$ 38,533	$ 29,664
Deferred Tax Assets	70,957	68,688
Additional Paid-In Capital	$ 9,145	$ 43,132
Blackstone
Business Reorganization And Spin Off [Line Items]
Cash and Cash Equivalents			$ 55,400
Deferred Tax Assets			58,400
Additional Paid-In Capital			$ 58,400
PJT Partners Holdings LP | Spinoff
Business Reorganization And Spin Off [Line Items]
Internal reorganization effective date	Oct. 01, 2015