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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
Sep. 30, 2019
USD ($)
Sep. 30, 2019
NOK (kr)
Derivative [Line Items]    
Fair Value / Carrying Amount of Asset / (Liability) $ (54,887)  
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) $ (15,474)  
Remaining Term (years) 2 years 1 month 6 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) $ (14,881)  
Remaining Term (years) 3 years 10 months 24 days  
Derivative, Notional Amount $ 102,000 kr 850,000
NIBOR | Three Point Seven Zero Margin [Member]    
Derivative [Line Items]    
Receivable Margin 3.70% 3.70%
Derivative, Fixed Interest Rate 5.92% 5.92%
Fair Value / Carrying Amount of Asset / (Liability) $ (24,532)  
Remaining Term (years) 7 months 6 days  
Derivative, Notional Amount $ 134,000 kr 1,000,000