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WORKERS' PARTICIPATION: (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statutory workers' participation
Current	$ 263.1	$ 274.7	$ 233.6
Deferred	14.3	(18.0)	10.7
Workers' participation expense (in USD)	277.4	256.7	244.3
Peru
Statutory workers' participation
Provision for workers' participation as a percentage of pre-tax earnings	8.00%
Number of months for which an individual worker's salary is capped for consideration of annual individual worker participation	18
Maximum taxable units contributed by employer to benefit fund (in Peruvian taxable units)	2,200
Maximum employer contribution to benefit fund (in USD)	$ 3.2
Mexican Operations
Statutory workers' participation
Provision for workers' participation as a percentage of pre-tax earnings	10.00%

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- Details

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- Definition

Represents the maximum employer contribution to benefit fund.

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No definition available.

+ Details

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- Definition

Represents the maximum taxable units contributed by employer to benefit fund.

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No definition available.

+ Details

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X

- Definition

Represents the number of periods for which an individual worker's salary is capped for determining the maximum annual amount payable as worker's participation to each individual worker.

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No definition available.

+ Details

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- Definition

Represents the provision for workers' participation as a percentage of pre-tax earnings.

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No definition available.

+ Details

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- Definition

Represents the workers' participation expenses incurred by the entity during the period.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Represents the current workers' participation expenses incurred by the entity during the period.

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No definition available.

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- Definition

Represents the deferred workers' participation expenses incurred by the entity during the period.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration