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Derivative Instruments and Hedging Activities - Interest Rate Swap Agreements (Detail)
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
EUR (€)
U.S. Dollar-denominated interest rate swaps 3 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Derivative [Line Items]    
Principal Amount $ 155,000,000  
Fair Value / Carrying Amount of Asset / (Liability) $ (2,626,000)  
Weighted-Average Remaining Term (Years) 1 year 3 months 18 days  
Fixed Interest Rate 2.20% 2.20%
United States Dollar Denominated Interest Rate Swaption One [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Derivative [Line Items]    
Principal Amount $ 155,000,000  
Fair Value / Carrying Amount of Asset / (Liability) $ 685,000  
Weighted-Average Remaining Term (Years) 1 year 3 months 18 days  
Fixed Interest Rate 3.30% 3.30%
United States Dollar Denominated Interest Rate Swaption Three [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Derivative [Line Items]    
Principal Amount $ 160,000,000  
Fair Value / Carrying Amount of Asset / (Liability) $ 1,956,000  
Weighted-Average Remaining Term (Years) 2 years 1 month 6 days  
Fixed Interest Rate 3.10% 3.10%
United States Dollar Denominated Interest Rate Swaption Two [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Derivative [Line Items]    
Principal Amount $ 160,000,000  
Fair Value / Carrying Amount of Asset / (Liability) $ (2,041,000)  
Weighted-Average Remaining Term (Years) 2 years 1 month 6 days  
Fixed Interest Rate 2.00% 2.00%
United States Dollar Denominated Interest Rate Swaption Five [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Derivative [Line Items]    
Principal Amount $ 160,000,000  
Fair Value / Carrying Amount of Asset / (Liability) $ 2,981,000  
Weighted-Average Remaining Term (Years) 2 years 6 months  
Fixed Interest Rate 2.90% 2.90%
United States Dollar Denominated Interest Rate Swaption Four [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Derivative [Line Items]    
Principal Amount $ 160,000,000  
Fair Value / Carrying Amount of Asset / (Liability) $ (1,739,000)  
Weighted-Average Remaining Term (Years) 2 years 6 months  
Fixed Interest Rate 1.80% 1.80%
Euro-denominated interest rate swaps [Member]    
Derivative [Line Items]    
Principal Amount | €   € 222,700,000
Euro-denominated interest rate swaps [Member] | Euro Interbank Offered Rate Euribor [Member]    
Derivative [Line Items]    
Principal Amount $ 241,798,000  
Fair Value / Carrying Amount of Asset / (Liability) $ (35,674,000)  
Weighted-Average Remaining Term (Years) 5 years  
Fixed Interest Rate 3.10% 3.10%
U.S. Dollar-denominated interest rate swaps 1 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Derivative [Line Items]    
Principal Amount $ 3,092,442,000  
Fair Value / Carrying Amount of Asset / (Liability) $ (312,131,000)  
Weighted-Average Remaining Term (Years) 5 years 4 months 24 days  
Fixed Interest Rate 3.40% 3.40%
U.S. Dollar-denominated interest rate swaps 2 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Derivative [Line Items]    
Principal Amount $ 412,392,000  
Fair Value / Carrying Amount of Asset / (Liability) $ (16,227,000)  
Weighted-Average Remaining Term (Years) 3 years  
Fixed Interest Rate 2.80% 2.80%
Interest Rate Swap Agreements [Member]    
Derivative [Line Items]    
Fair Value / Carrying Amount of Asset / (Liability) $ (364,816,000)