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Benefit Plans - Amounts Recognized in Accumulated Other Comprehensive Loss, Net of Tax (Detail) - Defined Benefit Pension Plan [Member] - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Amounts Recognized in Accumulated Other Comprehensive Loss, net of tax    
Net loss $ 2,115 $ 2,153
Deferred income tax benefit (719) (732)
Amount recognized $ 1,396 $ 1,421