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Derivative Instruments - Summary of Cross Currency Swap Agreements (Detail) - Cross Currency Swap Agreements [Member]
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
NOK
Derivative [Line Items]    
Fair Value / Carrying Amount of (Liability) $ (128,782,000)  
Norwegian Kroner-denominated Bond due in 2017 [Member] | NIBOR [Member]    
Derivative [Line Items]    
Principal amount $ 125,000,000 NOK 700,000,000
Floating Rate Receivable, Margin 5.25% 5.25%
Fixed Interest Payment on Cross Currency Rate Swap 6.88% 6.88%
Fair Value / Carrying Amount of (Liability) $ (49,703,000)  
Weighted-Average Remaining Term (Years) 1 year 3 months 18 days  
Norwegian Kroner-denominated Bond due in 2018 [Member] | NIBOR [Member]    
Derivative [Line Items]    
Principal amount $ 150,000,000 NOK 900,000,000
Floating Rate Receivable, Margin 4.35% 4.35%
Fixed Interest Payment on Cross Currency Rate Swap 6.43% 6.43%
Fair Value / Carrying Amount of (Liability) $ (54,027,000)  
Weighted-Average Remaining Term (Years) 2 years 8 months 12 days  
Norwegian Kroner denominated bonds due May 2020 [Member] | NIBOR [Member]    
Derivative [Line Items]    
Principal amount $ 134,000,000 NOK 1,000,000,000
Floating Rate Receivable, Margin 3.70% 3.70%
Fixed Interest Payment on Cross Currency Rate Swap 5.92% 5.92%
Fair Value / Carrying Amount of (Liability) $ (25,052,000)  
Weighted-Average Remaining Term (Years) 4 years 4 months 24 days