Defined Benefit Pension Plan and Postretirement Benefits - Reconciliation of Change in Benefit Obligation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Beginning benefit obligation	$ 3,100	$ 2,481
Service cost	433	387	$ 392
Interest cost	135	104	137
Actuarial (gains) losses	(121)	50
Effect of foreign currency translation	(138)	78
Ending benefit obligation	3,409	3,100	$ 2,481
Unfunded status	(3,409)	(3,100)
Net amount recognized	$ (3,409)	$ (3,100)