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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
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivatives, Fair Value [Line Items]        
Amount of Gain Recognized in Income on Derivative Instruments $ 0 $ 0 $ 199 $ 0
Interest Rate Swaps [Member] | Other Income [Member]        
Derivatives, Fair Value [Line Items]        
Amount of Gain Recognized in Income on Derivative Instruments $ 0 $ 0 $ 199 $ 0