v3.6.0.2
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2016
Feb. 22, 2017
Jun. 30, 2016
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Trading Symbol BSM    
Entity Registrant Name Black Stone Minerals, L.P.    
Entity Central Index Key 0001621434    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 1,064,853,317
Common Units      
Document Information [Line Items]      
Entity Partnership Units Outstanding   97,113,310  
Subordinated Units      
Document Information [Line Items]      
Entity Partnership Units Outstanding   95,149,984  
Preferred Units      
Document Information [Line Items]      
Entity Partnership Units Outstanding   52,691