v3.26.1
Subsequent Events (Details)
 6 Months Ended
Aug. 31, 2026
USD ($)
Options
Aug. 07, 2026
USD ($)
item
installment
Jul. 07, 2026
USD ($)
$ / shares
Sep. 07, 2021
$ / shares
Jun. 30, 2026
USD ($)
Options
Dec. 31, 2025
USD ($)
Jun. 28, 2024
USD ($)
Subsequent Events              
Long-term debt, outstanding         $ 905,915,000 $ 959,633,000  
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]         us-gaap:SecuredOvernightFinancingRateSofrMember    
Outstanding amount         $ 902,500,000    
Hedda loan facility              
Subsequent Events              
Face amount of debt         99,000,000   $ 99,000,000
Balloon payment to be paid         $ 61,900,000    
Spread on variable rate         1.60%    
Outstanding amount         $ 89,400,000    
$345 million loan facility              
Subsequent Events              
Face amount of debt         345,000,000 345,000,000  
Long-term debt, outstanding         $ 225,798,000 $ 238,343,000  
Common units              
Subsequent Events              
Cash distributions paid in the period per unit | $ / shares       $ 0.52      
Ingrid Knutsen              
Subsequent Events              
Number of options to extend one year periods | Options         3    
Option to extend term         one-year    
Subsequent Events | Hedda loan facility              
Subsequent Events              
Face amount of debt $ 99,000,000            
Balloon payment to be paid $ 61,900,000            
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrMember            
Spread on variable rate 1.60%            
Subsequent Events | Senior secured credit facility              
Subsequent Events              
Face amount of debt   $ 225,000,000          
Number of consecutive quarterly installments | installment   20          
Balloon payment to be paid   $ 111,100,000          
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:SecuredOvernightFinancingRateSofrMember          
Spread on variable rate   1.65%          
Debt instrument, vessels pledged as collateral | item   5          
Subsequent Events | $345 million loan facility              
Subsequent Events              
Long-term debt, outstanding   $ 225,800,000          
Subsequent Events | Common units              
Subsequent Events              
Cash distributions paid in the period per unit | $ / shares     $ 0.075        
Subsequent Events | Series A Preferred unit              
Subsequent Events              
Cash distribution     $ 1,700,000        
Subsequent Events | Hedda Knutsen              
Subsequent Events              
Option to extend term (in years) 5 years            
Subsequent Events | Hedda Knutsen | KNOT Shuttle Tankers AS | Knutsen Canadian Chartering AS              
Subsequent Events              
Purchase price for acquisition $ 113,000,000            
Capitalized fees 800,000            
Initial costs 24,400,000            
Subsequent Events | Hedda Knutsen | KNOT Shuttle Tankers AS | Knutsen Canadian Chartering AS | Hedda loan facility              
Subsequent Events              
Outstanding indebtedness $ 89,400,000            
Subsequent Events | Ingrid Knutsen              
Subsequent Events              
Fixed term of contract 3 years            
Number of options to extend one year periods | Options 3            
Option to extend term one year