Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	36	87	83
Expected return on assets	(45)	(104)	(114)
Amortization of prior service cost	0	0	0
Recognized net actuarial loss	25	21	66
Settlement losses	414	50	52
Net benefit cost	430	54	87
Post-Employment Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	51	72	127
Interest cost	141	149	165
Expected return on assets	0	0	0
Amortization of prior service cost	(338)	(369)	(647)
Recognized net actuarial loss	278	18	28
Settlement losses	0	0	0
Net benefit cost	$ 132	$ (130)	$ (327)