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Derivative Instruments and Hedging Activities - Commitment of Cross Currency Swaps (Detail) - Cross Currency Interest Rate Contract
kr in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
NOK (kr)
Derivative [Line Items]    
Fair Value / Carrying Amount of Asset / (Liability) $ (15,517)  
Six Point Zero Margin [Member] | NIBOR    
Derivative [Line Items]    
Derivative, Notional Amount $ 146,500 kr 1,200,000
Variable interest rate on debt 6.00% 6.00%
Fixed Rate Payable 7.72% 7.72%
Fair Value / Carrying Amount of Asset / (Liability) $ (9,051)  
Remaining Term (years) 9 months 18 days  
Five Point One Five Margin | NIBOR    
Derivative [Line Items]    
Derivative, Notional Amount $ 112,000 kr 1,000,000
Variable interest rate on debt 5.15% 5.15%
Fixed Rate Payable 5.74% 5.74%
Fair Value / Carrying Amount of Asset / (Liability) $ 4,505  
Remaining Term (years) 4 years 8 months 12 days  
Four Point Six Zero Margin [Member] | NIBOR    
Derivative [Line Items]    
Derivative, Notional Amount $ 102,000 kr 850,000
Variable interest rate on debt 4.60% 4.60%
Fixed Rate Payable 7.89% 7.89%
Fair Value / Carrying Amount of Asset / (Liability) $ (10,971)  
Remaining Term (years) 2 years 8 months 12 days