Annual report pursuant to Section 13 and 15(d)

Long-term Debt - Outstanding Non-Recourse Asset-Backed Debt and Bank Loans (Details)

v3.10.0.1
Long-term Debt - Outstanding Non-Recourse Asset-Backed Debt and Bank Loans (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Debt issuance costs   $ (17,000) $ (27,000)  
Total debt   835,000 1,211,000  
Carrying Value of Assets Pledged, Other     29,000  
Costs related to debt repayment $ 9,000 9,245 0 $ 0
Collateral Pledged [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Restricted cash   35,000 59,000  
Asset-Backed Non-recourse Debt [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Total collateral pledged against our nonrecourse debt   1,105,000 1,545,000  
Asset-Backed Non-recourse Debt [Member] | HASI Sustainable Yield Bond 2013-1 [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Outstanding Balance   $ 55,000 67,000  
Interest Rate   2.79%    
Anticipated Balance at Maturity   $ 51,000    
Carrying Value of Assets Pledged, Receivables   76,000 86,000  
Asset-Backed Non-recourse Debt [Member] | ABS Loan Agreement [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Outstanding Balance   $ 0 81,000  
Interest Rate   0.00%    
Anticipated Balance at Maturity   $ 0    
Carrying Value of Assets Pledged, Other   0 79,000  
Asset-Backed Non-recourse Debt [Member] | HASI Sustainable Yield Bond 2015-1A [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Outstanding Balance   $ 90,000 94,000  
Interest Rate   4.28%    
Anticipated Balance at Maturity   $ 0    
Carrying Value of Assets Pledged, Receivables   135,000 137,000  
Asset-Backed Non-recourse Debt [Member] | HASI Sustainable Yield Bond 2015-1B [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Outstanding Balance   $ 13,000 14,000  
Interest Rate   5.41%    
Anticipated Balance at Maturity   $ 0    
Carrying Value of Assets Pledged, Other   135,000 137,000  
Asset-Backed Non-recourse Debt [Member] | 2017 Credit Agreement [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Outstanding Balance   $ 112,000 180,000  
Interest Rate   4.12%    
Anticipated Balance at Maturity   $ 0    
Carrying Value of Assets Pledged, Other   151,000 226,000  
Asset-Backed Non-recourse Debt [Member] | HASI SYB Loan Agreement 2015-2 [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Outstanding Balance   $ 32,000 36,000  
Interest Rate   6.89%    
Anticipated Balance at Maturity   $ 0    
Carrying Value of Assets Pledged, Other   72,000 68,000  
Asset-Backed Non-recourse Debt [Member] | HASI SYB Loan Agreement 2015-3 [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Outstanding Balance   $ 0 143,000  
Interest Rate   0.00%    
Anticipated Balance at Maturity   $ 0    
Carrying Value of Assets Pledged, Receivables   0 171,000  
Asset-Backed Non-recourse Debt [Member] | HASI SYB Loan Agreement 2016-1 [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Outstanding Balance   $ 0 121,000  
Interest Rate   0.00%    
Anticipated Balance at Maturity   $ 0    
Carrying Value of Assets Pledged, Receivables   0 143,000  
Asset-Backed Non-recourse Debt [Member] | HASI SYB Trust 2016-2 [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Outstanding Balance   $ 77,000 81,000  
Interest Rate   4.35%    
Anticipated Balance at Maturity   $ 0    
Carrying Value of Assets Pledged, Receivables   81,000 86,000  
Asset-Backed Non-recourse Debt [Member] | 2017 Master Repurchase Agreement [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Outstanding Balance   $ 56,000 35,000  
Interest Rate   5.13%    
Anticipated Balance at Maturity   $ 53,000    
Carrying Value of Assets Pledged, Receivables   67,000 38,000  
Asset-Backed Non-recourse Debt [Member] | HASI ECON 101 Trust [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Outstanding Balance   $ 133,000 134,000  
Interest Rate   3.57%    
Anticipated Balance at Maturity   $ 0    
Carrying Value of Assets Pledged, Receivables   137,000 140,000  
Asset-Backed Non-recourse Debt [Member] | HASI SYB Trust 2017-1 [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Outstanding Balance   $ 159,000 162,000  
Interest Rate   3.86%    
Anticipated Balance at Maturity   $ 0    
Carrying Value of Assets Pledged, Receivables   208,000 209,000  
Other Non-recourse Debt [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Other non-recourse debt   125,000 90,000  
Anticipated Balance at Maturity   18,000    
Carrying Value of Assets Pledged, Receivables   $ 178,000 $ 162,000  
Other Non-recourse Debt [Member] | Minimum [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Interest Rate   3.15%    
Other Non-recourse Debt [Member] | Maximum [Member]        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Interest Rate   7.45%