v3.3.0.814
Segment Reporting - Additional Information (Detail) - Segment
9 Months Ended
Oct. 01, 2015
Sep. 30, 2015
Segment Reporting Information [Line Items]    
Number of business segments   5
Partnership Unit to Blackstone Common Unit ratio   100.00%
Subsequent Event | PJT Partners, Inc. | Common Class A    
Segment Reporting Information [Line Items]    
Partnership Unit to Blackstone Common Unit ratio 40.00%