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Machinery, Equipment and Improvements on Leased Assets - Summary of Property Plant and Equipment (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance $ 1,906,233 $ 1,655,688 $ 1,630,393
Additions (2,255) 240,811 68,046
Divestitures (7,417) (9,737) (18,870)
Currency translation effect 9,123 19,471 (23,881)
Ending balance 1,905,684 1,906,233 1,655,688
Machinery and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 1,426,828 1,197,349  
Ending balance 1,393,985 1,426,828 1,197,349
Office furniture and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 165,061 123,805  
Ending balance 196,928 165,061 123,805
Computer equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 228,427 251,071  
Ending balance 225,984 228,427 251,071
Transportation equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 18,236 12,510  
Ending balance 25,058 18,236 12,510
Communication equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 12,810 13,656  
Ending balance 11,637 12,810 13,656
Improvements on leased assets [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 54,871 57,297  
Ending balance 52,092 54,871 57,297
Investment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 3,943,153 3,369,500 3,098,352
Additions 437,405 632,455 392,506
Divestitures (86,332) (81,194) (70,546)
Currency translation effect (21,532) 22,392 (50,812)
Ending balance 4,272,694 3,943,153 3,369,500
Investment [Member] | Machinery and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 2,666,532 2,268,920 2,181,305
Additions 224,218 444,495 175,457
Divestitures (39,546) (62,642) (49,970)
Currency translation effect (12,481) 15,759 (37,872)
Ending balance 2,838,723 2,666,532 2,268,920
Investment [Member] | Office furniture and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 301,326 240,898 208,676
Additions 60,415 61,414 40,958
Divestitures (12,209) (1,455) (6,427)
Currency translation effect (1,965) 469 (2,309)
Ending balance 347,567 301,326 240,898
Investment [Member] | Computer equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 814,463 710,584 596,652
Additions 133,162 107,381 136,915
Divestitures (30,576) (9,104) (12,751)
Currency translation effect (6,301) 5,602 (10,232)
Ending balance 910,748 814,463 710,584
Investment [Member] | Transportation equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 58,095 47,068 42,037
Additions 17,585 13,537 6,650
Divestitures (1,178) (3,072) (1,220)
Currency translation effect (785) 562 (399)
Ending balance 73,717 58,095 47,068
Investment [Member] | Communication equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 31,154 30,432 28,224
Additions 1,261 1,633 2,386
Divestitures (2,823) (911) (178)
Ending balance 29,592 31,154 30,432
Investment [Member] | Improvements on leased assets [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 71,583 71,598 41,458
Additions 764 3,995 30,140
Divestitures   (4,010)  
Ending balance 72,347 71,583 71,598
Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (2,036,920) (1,713,812) (1,467,959)
Additions (439,660) (391,644) (324,460)
Divestitures 78,915 71,457 51,676
Currency translation effect 30,655 (2,921) 26,931
Ending balance (2,367,010) (2,036,920) (1,713,812)
Accumulated depreciation and amortisation [member] | Machinery and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (1,239,704) (1,071,571) (926,836)
Additions (260,223) (221,674) (195,382)
Divestitures 37,221 55,770 33,308
Currency translation effect 17,968 (2,229) 17,339
Ending balance (1,444,738) (1,239,704) (1,071,571)
Accumulated depreciation and amortisation [member] | Office furniture and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (136,265) (117,093) (108,053)
Additions (26,821) (20,839) (16,363)
Divestitures 11,059 1,864 5,641
Currency translation effect 1,388 (197) 1,682
Ending balance (150,639) (136,265) (117,093)
Accumulated depreciation and amortisation [member] | Computer equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (586,036) (459,513) (377,033)
Additions (136,589) (135,272) (101,207)
Divestitures 26,949 9,054 11,373
Currency translation effect 10,912 (305) 7,354
Ending balance (684,764) (586,036) (459,513)
Accumulated depreciation and amortisation [member] | Transportation equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (39,859) (34,558) (30,374)
Additions (10,210) (8,177) (5,960)
Divestitures 1,023 3,066 1,220
Currency translation effect 387 (190) 556
Ending balance (48,659) (39,859) (34,558)
Accumulated depreciation and amortisation [member] | Communication equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (18,344) (16,776) (14,281)
Additions (2,274) (2,354) (2,629)
Divestitures 2,663 786 134
Ending balance (17,955) (18,344) (16,776)
Accumulated depreciation and amortisation [member] | Improvements on leased assets [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (16,712) (14,301) (11,382)
Additions (3,543) (3,328) (2,919)
Divestitures   917  
Ending balance $ (20,255) $ (16,712) $ (14,301)