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Accrued Severance Benefits - Changes in Accrued Severance Benefits (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Postemployment Benefits [Abstract]
Beginning balance	$ 140,405	$ 135,356
Provisions	7,260	4,034
Severance payments	(1,341)	(1,514)
Translation adjustments	(726)	(1,700)
Ending balance	145,598	136,176
Less: Cumulative contributions to the National Pension Fund	(343)	(375)
Group severance insurance plan	(764)mx_GroupSeveranceInsurancePlan	(788)mx_GroupSeveranceInsurancePlan
Accrued severance benefits, net	$ 144,491	$ 135,013	$ 139,289

The carrying amount as of the balance sheet date of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement.

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