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Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net Periodic Benefit Cost:      
Service cost $ 487 $ 273 $ 437
Interest cost 104 57 58
Projected return on plan assets (28) (47) (51)
Amortization of unrecognized net transition obligation and unrecognized net actuarial gain 11 27 (19)
Net periodic benefit cost $ 574 $ 310 $ 425