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Derivative Instruments and Hedging Activities - Commitment of Foreign Currency Forward Contracts (Detail) - Dec. 31, 2015
$ in Thousands
USD ($)
NOK / $
€ / $
SGD / $
NOK
NOK / $
€ / $
SGD / $
EUR (€)
NOK / $
€ / $
SGD / $
SGD
NOK / $
€ / $
SGD / $
Derivative [Line Items]        
Fair Value / Carrying Amount of Asset (Liability) $ (18,826)      
Expected Maturity Amount of Foreign Currency Derivatives in Next Fiscal Year 129,502      
Expected Maturity Amount of Foreign Currency Derivatives in Year Two $ 42,274      
Euro [Member]        
Derivative [Line Items]        
Average Forward Rate | € / $ 0.91 0.91 0.91 0.91
Fair Value / Carrying Amount of Asset (Liability) $ (45)      
Expected Maturity Amount of Foreign Currency Derivatives in Next Fiscal Year $ 12,153      
Euro [Member] | Foreign currency forward contracts [Member]        
Derivative [Line Items]        
Contract Amount in Foreign Currency | €     € 11,103,000  
Norwegian Kroner [Member]        
Derivative [Line Items]        
Average Forward Rate | NOK / $ 7.72 7.72 7.72 7.72
Fair Value / Carrying Amount of Asset (Liability) $ (18,005)      
Expected Maturity Amount of Foreign Currency Derivatives in Next Fiscal Year 100,812      
Expected Maturity Amount of Foreign Currency Derivatives in Year Two $ 42,274      
Norwegian Kroner [Member] | Foreign currency forward contracts [Member]        
Derivative [Line Items]        
Contract Amount in Foreign Currency | NOK   NOK 1,105,000,000    
Singapore Dollar [Member]        
Derivative [Line Items]        
Average Forward Rate | SGD / $ 1.36 1.36 1.36 1.36
Fair Value / Carrying Amount of Asset (Liability) $ (776)      
Expected Maturity Amount of Foreign Currency Derivatives in Next Fiscal Year $ 16,537      
Singapore Dollar [Member] | Foreign currency forward contracts [Member]        
Derivative [Line Items]        
Contract Amount in Foreign Currency | SGD       SGD 22,442,000