Employee Benefit Plans - Components of Net Periodic Benefit Cost (Gain) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Pension Plan, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	$ 131	$ 142
Expected (return) on plan assets	(196)	(202)
Amortization of prior service cost	0	0
Amortization of net obligation at transition	0	0
Recognized net loss due to settlement	0	0
Recognized net actuarial loss	76	37
Net periodic benefit (gain) cost	11	(23)
Other Postretirement Benefit Plan, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	23	15
Interest cost	30	30
Amortization of prior service cost	0	0
Amortization of net obligation at transition	0	0
Recognized net loss due to settlement	0	0
Net periodic benefit (gain) cost	$ 53	$ 45