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Employee Benefit Plans - Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee Benefit Plan [Line Items]        
Net actuarial loss $ (1,871) $ (1,773)    
Tax effect 654 620    
Other comprehensive income (loss) (1,217) (1,153) $ (1,063) $ (1,084)
Employee Benefit Plan [Member]        
Employee Benefit Plan [Line Items]        
Other comprehensive income (loss) $ (1,217) $ (1,153)