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STOCKHOLDERS' EQUITY: - Directors' Stock Award Plan (Details) - shares | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Share based Compensation Plan |  |
Total SCC shares reserved for the plan | 600,000 | 600,000
Activity in directors' stock award plan |  |
Total shares granted at the beginning of the period (in shares) | (346,800) | (334,800)
Granted in the period | (16,000) | (12,000)
Total shares granted at the end of the period (in shares) | (362,800) | (346,800)
Remaining shares reserved | 237,200 | 253,200
Parent Company (Grupo Mexico) common shares |  |
Activity in directors' stock award plan |  |
Treasury stock balance at the end of the period (in shares) | 100,248,326 | 110,941,769
Directors' Stock Award Plan |  |
Share based Compensation Plan |  |
Common shares received on election as director | 1,200 |
Additional shares issued at each annual general meeting | 1,200 |
Total SCC shares reserved for the plan | 600,000 |
Period of extension of plan | 5 years |
Increased share awards issued to directors | 1,600 |

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- Definition Represents the additional number of shares issued to the director at each annual general meeting. + References No definition available. + Details
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- Definition Represents the extension term of plan for issuance of shares to employees and other management personnel. + References No definition available. + Details
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- Definition Represents the increased number of shares issued to the director at each annual general meeting. + References No definition available. + Details
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- Definition Represents the number of shares issued to the director at the time of election. + References No definition available. + Details
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- Definition Represents the number of shares granted under the share based compensation arrangement plan as of the balance sheet date. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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