Accumulated Other Comprehensive Income (Loss) - Related Tax Effects Allocated to Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Net actuarial gain (loss) and prior service credit, before tax amount	$ 2,169	$ (10,071)
Reclassification of actuarial loss and prior service cost to net income, before tax amount	616	256
Total recognized in other comprehensive income (loss)	2,785	(9,815)
Cumulative translation adjustment, before tax amount	(4,596)	(4,637)
Total other comprehensive income (loss), before tax amount	(1,811)	(14,452)
Net actuarial gain (loss) and prior service credit, tax	(449)	3,438
Reclassification of actuarial loss and prior service cost to net income, tax	(130)	(3)
Net unrealized loss, before tax amount, tax	(579)	3,435
Cumulative translation adjustment, tax	24	37
Total other comprehensive income (loss), tax	(555)	3,472
Net actuarial gain (loss) and prior service credit, after tax amount	1,720	(6,633)
Reclassification of actuarial loss and prior service cost to net income, after tax amount	486	253
Net unrealized loss, before tax amount, after tax amount	2,206	(6,380)
Cumulative translation adjustment, after tax amount	(4,572)	(4,600)	$ (4,338)
Total other comprehensive income (loss), after tax amount	$ (2,366)	$ (10,980)