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WORKERS' PARTICIPATION: (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Statutory workers' participation |  |  |
Workers' participation expense (in USD) | $ 276.7 | $ 234.4 | $ 134.7
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) | $ 2.9 |  |
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. + References No definition available. + Details
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- Definition Represents the maximum taxable units contributed by employer to benefit fund. + References No definition available. + Details
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- 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. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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- Definition Represents the provision for workers' participation as a percentage of pre-tax earnings. + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Represents the workers' participation expenses incurred by the entity during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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