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Derivatives - Summary of Gains on Derivatives Not Designated as Hedging Instruments (Detail) (Derivatives Not Designated as Hedging Instruments [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Derivatives Not Designated as Hedging Instruments [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Net gain recognized in income $ 106 $ 491