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Derivative Instruments and Hedging Activities - Effect of Gains (Losses) on Cross Currency Swaps (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Realized and Unrealized gains (losses) $ (1,604) $ (2,046) $ 15,906 $ (2,940)
Cross Currency Interest Rate Contract [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized and Unrealized gains (losses) 9,730 (24,947) (50,086) (11,770)
Cross Currency Interest Rate Contract [Member] | Realized losses [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized and Unrealized gains (losses) (3,771) (144) (7,934) (289)
Cross Currency Interest Rate Contract [Member] | Unrealized gains (losses) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized and Unrealized gains (losses) $ 13,501 $ (24,803) $ (42,152) $ (11,481)