Derivative Financial Instruments - Impact of Derivative Instruments on Consolidated Statement of Operations (Detail) (Derivatives in ASC 815 Cash Flow Hedging Relationships [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 7,497	$ 5,237	$ (5,559)
Other income (expenses) - Others [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Statement of Operations on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	634	1,665	(542)
Net sales [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Statement of Operations (Effective Portion)	2,984	(4,608)	10,979
Options [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)			(85)
Options [Member] | Other income (expenses) - Others [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Statement of Operations on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)			(18)
Options [Member] | Net sales [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Statement of Operations (Effective Portion)			(829)
Forward [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	3,405	3,416	(3,125)
Forward [Member] | Other income (expenses) - Others [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Statement of Operations on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	412	1,300	(215)
Forward [Member] | Net sales [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Statement of Operations (Effective Portion)	3,484	(3,192)	10,708
Zero cost collars [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	4,092	1,821	(2,349)
Zero cost collars [Member] | Other income (expenses) - Others [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Statement of Operations on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	222	365	(309)
Zero cost collars [Member] | Net sales [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Statement of Operations (Effective Portion)	$ (500)	$ (1,416)	$ 1,100