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Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]        
Net loss $ 963 $ 852 $ 848  
Transition obligation   1 1  
Total recognized in accumulated other comprehensive income $ 963 $ 853 $ 849 $ 461