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Derivative Instruments and Hedging Activities - Commitment of Foreign Currency Forward Contracts (Detail) - Jun. 30, 2015
€ in Thousands, SGD in Thousands, NOK in Thousands, $ in Thousands
USD ($)
NOK / $
€ / $
SGD / $
NOK
NOK / $
€ / $
SGD / $
EUR (€)
NOK / $
€ / $
SGD / $
SGD
NOK / $
€ / $
SGD / $
Derivative [Line Items]        
Fair Value / Carrying Amount of Asset (Liability) $ (15,349)      
Expected Maturity Amount of Foreign Currency Derivatives in Current Year 79,451      
Expected Maturity Amount of Foreign Currency Derivatives in Next Fiscal Year 95,678      
Expected Maturity Amount of Foreign Currency Derivatives in Year Two $ 8,585      
Euro [Member]        
Derivative [Line Items]        
Average Forward Rate | € / $ 0.88 0.88 0.88 0.88
Fair Value / Carrying Amount of Asset (Liability) $ (593)      
Expected Maturity Amount of Foreign Currency Derivatives in Current Year 24,011      
Expected Maturity Amount of Foreign Currency Derivatives in Next Fiscal Year $ 2,413      
Euro [Member] | Foreign currency forward contracts [Member]        
Derivative [Line Items]        
Contract Amount in Foreign Currency | €     € 23,137  
Norwegian Kroner [Member]        
Derivative [Line Items]        
Average Forward Rate | NOK / $ 7.06 7.06 7.06 7.06
Fair Value / Carrying Amount of Asset (Liability) $ (14,809)      
Expected Maturity Amount of Foreign Currency Derivatives in Current Year 55,440      
Expected Maturity Amount of Foreign Currency Derivatives in Next Fiscal Year 76,728      
Expected Maturity Amount of Foreign Currency Derivatives in Year Two $ 8,585      
Norwegian Kroner [Member] | Foreign currency forward contracts [Member]        
Derivative [Line Items]        
Contract Amount in Foreign Currency | NOK   NOK 993,500    
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) $ 53      
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