Employee Benefit Plans - Status of the Company’s Benefit Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefit Plan [Member]
Change in benefit obligation:
Beginning of year	$ 2,016	$ 2,190	$ 2,690
Service cost	0	0	0
Interest cost	36	87	83
Actuarial loss (gain)	(9)	35	(241)
Negative plan amendment benefit	0	0	0
Benefits paid	(2,043)	(296)	(342)
Benefit obligation at end of year	0	2,016	2,190
Post-Employment Benefit Plan [Member]
Change in benefit obligation:
Beginning of year	4,926	4,827	5,700
Service cost	51	72	127
Interest cost	141	149	165
Actuarial loss (gain)	45	1,632	(558)
Negative plan amendment benefit	0	(1,183)	0
Benefits paid	(482)	(571)	(607)
Benefit obligation at end of year	$ 4,681	$ 4,926	$ 4,827