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Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2017
Mar. 29, 2018
Jun. 30, 2017
Document and Entity Information      
Entity Registrant Name NorthStar Healthcare Income, Inc.    
Entity Central Index Key 0001503707    
Entity Current Reporting Status Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   187,229,084  
Amendment Flag false    
Document Type 10-K    
Document Period End Date Dec. 31, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Entity Public Float     $ 0
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filer No