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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statement of Earnings (Detail) (Derivatives not designated as hedging instruments [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Derivatives, Fair Value [Line Items]        
Amount of Gain Recognized in Income on Derivative Instruments    $ 189    $ 692
Interest rate swaps [Member] | Other Income [Member]
       
Derivatives, Fair Value [Line Items]        
Amount of Gain Recognized in Income on Derivative Instruments    $ 189    $ 692