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Derivative Instruments and Hedging Activities - Commitment of Cross Currency Swaps (Detail)
NOK in Thousands, $ in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2017
NOK
Derivative [Line Items]    
Fair Value / Carrying Amount of Asset / (Liability) $ 653  
Cross Currency Interest Rate Contract    
Derivative [Line Items]    
Fair Value / Carrying Amount of Asset / (Liability) (186,764)  
Cross Currency Interest Rate Contract | NIBOR | 5.75%    
Derivative [Line Items]    
Notional Amount $ 70,946 NOK 420,000
Receivable Margin 5.75% 5.75%
Fixed Interest Rate 8.84% 8.84%
Fair Value / Carrying Amount of Asset / (Liability) $ (23,136)  
Remaining Term (years) 1 year 4 months 24 days  
Cross Currency Interest Rate Contract | NIBOR | 5.75%    
Derivative [Line Items]    
Notional Amount $ 143,536 NOK 800,000
Receivable Margin 5.75% 5.75%
Fixed Interest Rate 7.58% 7.58%
Fair Value / Carrying Amount of Asset / (Liability) $ (52,004)  
Remaining Term (years) 1 year 6 months  
Cross Currency Interest Rate Contract | NIBOR | 4.35%    
Derivative [Line Items]    
Notional Amount $ 150,000 NOK 900,000
Receivable Margin 4.35% 4.35%
Fixed Interest Rate 6.43% 6.43%
Fair Value / Carrying Amount of Asset / (Liability) $ (45,161)  
Remaining Term (years) 1 year 2 months 12 days  
Cross Currency Interest Rate Contract | NIBOR | 3.70%    
Derivative [Line Items]    
Notional Amount $ 134,000 NOK 1,000,000
Receivable Margin 3.70% 3.70%
Fixed Interest Rate 5.92% 5.92%
Fair Value / Carrying Amount of Asset / (Liability) $ (16,572)  
Remaining Term (years) 2 years 10 months 24 days  
Cross Currency Interest Rate Contract | NIBOR | 4.25%    
Derivative [Line Items]    
Notional Amount $ 162,200 NOK 1,000,000
Receivable Margin 4.25% 4.25%
Fixed Interest Rate 7.45% 7.45%
Fair Value / Carrying Amount of Asset / (Liability) $ (49,720)  
Remaining Term (years) 1 year 7 months 6 days  
Cross Currency Interest Rate Contract | NIBOR | 6.00%    
Derivative [Line Items]    
Notional Amount $ 146,500 NOK 1,200,000
Receivable Margin 6.00% 6.00%
Fixed Interest Rate 7.70% 7.70%
Fair Value / Carrying Amount of Asset / (Liability) $ (171)  
Remaining Term (years) 4 years 3 months 18 days  
Foreign Currency Contracts | NIBOR | 5.75%    
Derivative [Line Items]    
Notional Amount $ 1,200 NOK 7,200
Percent premium 3.00% 3.00%
Foreign Currency Contracts | NIBOR | 5.75%    
Derivative [Line Items]    
Notional Amount $ 3,400 NOK 19,200
Percent premium 3.00% 3.00%