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Derivative Instruments and Hedging Activities - Commitment of Cross Currency Swaps (Detail) - Cross Currency Interest Rate Contract [Member]
kr in Thousands, $ in Thousands
3 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
NOK (kr)
Derivative [Line Items]    
Fair Value / Carrying Amount of Asset / (Liability) $ (46,179)  
NIBOR | Six Point Zero Margin [Member]    
Derivative [Line Items]    
Receivable Margin 6.00% 6.00%
Derivative, Fixed Interest Rate 7.72% 7.72%
Fair Value / Carrying Amount of Asset / (Liability) $ (24,681)  
Remaining Term (years) 1 year 3 months 18 days  
Derivative, Notional Amount $ 146,500 kr 1,200,000
NIBOR | 4.60%    
Derivative [Line Items]    
Receivable Margin 4.60% 4.60%
Derivative, Fixed Interest Rate 7.89% 7.89%
Fair Value / Carrying Amount of Asset / (Liability) $ (21,498)  
Remaining Term (years) 3 years 2 months 12 days  
Derivative, Notional Amount $ 102,000 kr 850,000