v3.3.1.900
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2016
May. 06, 2016
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q1  
Trading Symbol BSM  
Entity Registrant Name Black Stone Minerals, L.P.  
Entity Central Index Key 0001621434  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Common Units    
Document Information [Line Items]    
Entity Partnership Units Outstanding   96,531,540
Subordinate Units    
Document Information [Line Items]    
Entity Partnership Units Outstanding   95,189,076
Preferred Units    
Document Information [Line Items]    
Entity Partnership Units Outstanding   52,691