XML 73 R62.htm IDEA: XBRL DOCUMENT v3.7.0.1
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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivatives, Fair Value [Line Items]        
Amount of Gain Recognized in Income on Derivative Instruments $ 71 $ 327 $ 394 $ 385
Interest Rate Swaps [Member] | Other Income [Member]        
Derivatives, Fair Value [Line Items]        
Amount of Gain Recognized in Income on Derivative Instruments $ 71 $ 327 $ 394 $ 385