Related Tax Effects Allocated to Each Component of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial gain (loss) and prior service credit, before tax amount	$ 8,850	$ (2,455)
Reclassification of actuarial loss and prior service cost to net income, before tax amount	(443)	413
Net unrealized loss, before tax amount, before tax amount	8,407	(2,042)
Cumulative translation adjustment, before tax amount	(4,318)	1,830
Total other comprehensive income (loss), before tax amount	4,089	(212)
Net actuarial gain (loss) and prior service credit, tax	(2,549)	339
Reclassification of actuarial loss and prior service cost to net income, tax	52	(56)
Net unrealized loss, before tax amount, tax	(2,497)	283
Cumulative translation adjustment, tax	(20)	(138)
Total other comprehensive income (loss), tax	(2,517)	145
Net actuarial gain (loss) and prior service credit, after tax amount	6,301	(2,116)
Reclassification of actuarial loss and prior service cost to net income, after tax amount	(391)	357
Net unrealized loss, before tax amount, after tax amount	5,910	(1,759)
Cumulative translation adjustment, after tax amount	(4,338)	1,692	(1,416)
Total other comprehensive income (loss), after tax amount	$ 1,572	$ (67)