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Accrued Severance Benefits - Changes in Accrued Severance Benefits (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Employee severance [Member]
Sep. 30, 2012
Employee severance [Member]
Sep. 30, 2013
Employee severance [Member]
Sep. 30, 2012
Employee severance [Member]
Restructuring Cost and Reserve [Line Items]            
Beginning balance     $ 113,286 $ 97,967 $ 113,624 $ 91,882
Provisions     4,975 5,803 15,661 16,779
Severance payments     (1,392) (753) (4,331) (5,569)
Translation adjustments     7,903 3,148 (182) 3,073
Ending balance     124,772 106,165 124,772 106,165
Less: Cumulative contributions to the National Pension Fund     (380) (383) (380) (383)
Group Severance insurance plan     (773) (731) (773) (731)
Accrued severance benefits, net $ 123,619 $ 112,446 $ 123,619 $ 105,051 $ 123,619 $ 105,051