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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
Mar. 31, 2017
Mar. 31, 2016
Derivatives, Fair Value [Line Items]    
Amount of Gain Recognized in Income on Derivative Instruments $ 323 $ 58
Interest Rate Swaps [Member] | Other Income [Member]    
Derivatives, Fair Value [Line Items]    
Amount of Gain Recognized in Income on Derivative Instruments $ 323 $ 58