| Notes | COMMON STOCK | ADDITIONAL PAD-IN CAPITAL | OTHER EQUITY RESERVES | RETAINED EARNINGS | TOTAL CONTROLLING INTEREST | NON-CONTROLLING INTERES | TOTAL STOCKHOLDERS' EQUITY | ||
|---|---|---|---|---|---|---|---|---|---|
| Balance at December 31, 2008 | $ | 4,117 | 70,171 | 28,730 | 87,674 | 190,692 | 46,575 | 237,267 | |
| Currency translation of foreign subsidiaries | 16B | – | – | (904) | – | (904) | – | (904) | |
| Hedge derivative financial instruments | 12 | - | – | 450 | – | 450 | – | 450 | |
| Deferred income tax recognized directly in equity | 15 | - | – | 941 | – | 941 | – | 941 | |
| Net income | – | – | – | 1,409 | 1,409 | 240 | 1,649 | ||
| Comprehensive income for the period | – | – | 487 | 1,409 | 1,896 | 240 | 2,136 | ||
| Adoption of new Mexican Financial Reporting Standards |
15A | – | – | – | (2,245) | (2,245) | – | (2,245) | |
| Capitalization of retained earnings | 16A | 3 | 4,370 | – | (4,373) | – | – | – | |
| Issuance of common stock | 16A | 7 | 14,633 | - | - | 14,640 | – | 14,640 | |
| Treasury shares owned by subsidiaries | 16 | – | 9,623 | – | - | 9,623 | - | 9,623 | |
| Issuance and effects of convertible securities | 16B | – | – | 1,971 | - | 1,971 | 1,971 | ||
| Effects of perpetual debentures | 16D | – | – | (2,704) | - | (2,704) | (1,636) | (4,340) | |
| Changes in non-controlling interest | 16D | – | – | – | - | - | (1,482) | (1,482) | |
| Balance at December 31, 2009 | 4,127 | 98,797 | 28,484 | 82,465 | 213,873 | 43,697 | 257,570 | ||
| Currency translation of foreign subsidiaries | 16B | – | – | (12,050) | - | (12,050) | - | (12,050) | |
| Deferred income tax recognized directly in equity | 15 | – | – | 737 | - | 737 | - | 737 | |
| Net loss | – | – | – | (16,516) | (16,516) | 27 | (16,489) | ||
| Comprehensive loss for the period | - | - | (11,313) | (16,516) | (27,829) | 27 | (27,802) | ||
| Adoption of new Mexican Financial Reporting Standards | 15A | - | - | - | 2,806 | 2,806 | - | 2,806 | |
| Capitalization of retained earnings | 16A | 5 | 5,476 | – | (5,481) | – | – | – | |
| Issuance of common stock | 16A | - | 317 | - | - | 317 | - | 317 | |
| Issuance and effects of convertible securities | 16B | - | - | 1,232 | - | 1,232 | - | 1,232 | |
| Effects of perpetual debentures | 16D | - | - | 3,777 | - | 3,777 | (23,549) | (19,772) | |
| Changes in non-controlling interest | 16D | - | - | - | - | - | (651) | (651) | |
| Balance at December 31, 2010 | 4,132 | 104,590 | 22,180 | 63,274 | 194,176 | 19,524 | 213,700 | ||
| Currency translation of foreign subsidiaries | 16B | - | - | 12,495 | - | 12,495 | - | 12,495 | |
| Effects from available-for-sale investments | 9B | - | - | (58) | - | (58) | - | (58) | |
| Deferred income tax recognized directly in equity | 15 | - | - | (1,374) | - | (1,374) | - | (1,374) | |
| Net loss | - | - | - | (19,127) | (19,127) | (37) | (19,164) | ||
| Comprehensive loss for the period | 16A | - | - | 11,063 | (19,127) | (8,064) | (37) | (8,101) | |
| Capitalization of retained earnings | 16A | 3 | 4,213 | - | (4,216) | - | - | - | |
| Issuance of common stock | 16A | - | 506 | - | - | 506 | - | 506 | |
| Issuance and effects of convertible securities | 16B | - | - | 3,959 | - | 3,959 | - | 3,959 | |
| Effects of perpetual debentures | 16D | - | - | 827 | - | 827 | (3,221) | (2,394) | |
| Changes in non-controlling interest | 11A , 16D | - | - | (387) | - | (387) | 454 | 67s | |
| Balance at December 31, 2011 | $ | 4,135 | 109,309 | 37,642 | 39,931 | 191,017 | 16,720 | 207,737 |