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Derivatives - Schedule of Change in Fair Value of Derivative Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Non-hedging interest rate derivatives, increase (decrease) in other income $ 1,428 $ 755 $ (6,687)