Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

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Document and Entity Information
 3 Months Ended
Mar. 31, 2013
May 23, 2013
Document Document And Entity Information [Abstract]    
Document Type 10-Q/A  
Amendment Flag true  
AmendmentDescription The sole purpose of this Amendment No. 1 to the Quarterly Report on Form 10-Q for Hannon Armstrong Sustainable Infrastructure Capital, Inc., for the period ended March 31, 2013, filed with the Securities and Exchange Commission on May 23, 2013 (the “Form 10-Q”), is to furnish Exhibit 101 to the Form 10-Q in accordance with Rule 405(a)(2)(ii) of Regulation S-T. Exhibit 101 consists of the interactive data files that were not included in the Form 10-Q, as allowed by the 30-day grace period for the first time the registrant submits such files. This Amendment No. 1 does not otherwise change or update the disclosures set forth in the Form 10-Q as originally filed and does not otherwise reflect events occurring after the original filing of the Form 10-Q.  
Document Period End Date Mar. 31, 2013  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q1  
Trading Symbol HASI  
Entity Registrant Name Hannon Armstrong Sustainable Infrastructure Capital, Inc.  
Entity Central Index Key 0001561894  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   16,529,881