Employee Benefit Plans - Recognized Net Periodic Benefit Cost and Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Sale Of Subsidiary [Abstract]
Service cost	$ 96	$ 84	$ 125
Interest cost	90	102	84
Net amortization of transition obligation and actuarial loss	173	149	61
Net periodic benefit cost	359	335	270
Net loss	311	117	821
Plan amendment	0	0	(602)
Amortization of loss	(173)	(149)	(54)
Amortization of transition obligation	0	0	(7)
Total recognized in other comprehensive income	138	(32)	158
Total recognized in net periodic benefit cost and other comprehensive income	$ 497	$ 303	$ 428