v2.4.0.8
Document and Entity Information
3 Months Ended
Mar. 31, 2014
Apr. 28, 2014
Class A Common Stock [Member]
Apr. 28, 2014
Class B Common Stock [Member]
Document Information [Line Items]      
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Mar. 31, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus Q1    
Trading Symbol PEGI    
Entity Registrant Name Pattern Energy Group Inc.    
Entity Central Index Key 0001561660    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   35,703,134 15,555,000