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Significant accounting policies (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Significant Accounting Policies [Line Items]        
Debt Instrument, Financial Covenants $ 385,000,000 $ 385,000,000    
Allowance for credit loss 96,000 96,000   $ 0
Allowance for Credit Loss on Trade Receivables and Amount Due from Affiliates 60,000 60,000   0
Allowance for expected credit losses 0 0    
SRV Joint Gas Ltd [Member]        
Significant Accounting Policies [Line Items]        
Advances to Affiliate 3,200,000 3,200,000   3,000,000.0
SRV Joint Gas Two Ltd [Member]        
Significant Accounting Policies [Line Items]        
Advances to Affiliate $ 900,000 900,000   800,000
ASU 2016-13        
Significant Accounting Policies [Line Items]        
Allowance for credit loss     $ 100,000  
Allowance for Credit Loss on Trade Receivables and Amount Due from Affiliates     60,000.00  
Allowance for expected credit losses   $ 0    
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13        
Significant Accounting Policies [Line Items]        
Cumulative Effect on Retained Earnings, Net of Tax     $ 160,000  
PT Hoegh LNG Lampung [Member]        
Significant Accounting Policies [Line Items]        
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage   100.00%    
Statutory Reserve on Paid Up Capital Percentage 20.00% 20.00%    
Hoegh LNG Cyprus Limited [Member]        
Significant Accounting Policies [Line Items]        
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage   100.00%    
Hoegh LNG Colombia Holding Ltd [Member]        
Significant Accounting Policies [Line Items]        
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage   100.00%    
Variable Interest Entity, Primary Beneficiary [Member] | SRV Joint Gas Ltd [Member]        
Significant Accounting Policies [Line Items]        
Net assets (liabilities) $ 3,300,000 $ 3,300,000   2,600,000
Variable Interest Entity, Primary Beneficiary [Member] | SRV Joint Gas Two Ltd [Member]        
Significant Accounting Policies [Line Items]        
Net assets (liabilities) $ 2,200,000 $ 2,200,000   $ 700,000