Accrued Severance Benefits - Changes in Accrued Severance Benefits (Detail) (USD $) In Thousands, unless otherwise specified			3 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Employee severance [Member]	Sep. 30, 2011 Employee severance [Member]	Sep. 30, 2012 Employee severance [Member]	Sep. 30, 2011 Employee severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			$ 97,967	$ 98,647	$ 91,882	$ 88,973
Provisions			5,803	4,741	16,779	13,137
Severance payments			(753)	(2,804)	(5,569)	(6,549)
Translation adjustments			3,148	(8,370)	3,073	(3,347)
Ending Balance			106,165	92,214	106,165	92,214
Less: Cumulative contributions to the National Pension Fund			(383)	(414)	(383)	(414)
Group Severance insurance plan			(731)	(694)	(731)	(694)
Accrued severance benefits, net	$ 105,051	$ 90,755	$ 105,051	$ 91,106	$ 105,051	$ 91,106