v3.8.0.1
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2017
Oct. 31, 2017
Document Information [Line Items]    
Entity Registrant Name TERRAFORM GLOBAL, INC.  
Entity Central Index Key 0001620702  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Document Type 10-Q  
Document Period End Date Sep. 30, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Common Class A    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   112,100,528
Common Class B    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   61,343,054
Common Class B1    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   0