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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance $ 1,655,688 $ 1,630,393 $ 1,555,593
Additions 240,811 68,046 16,120
Divestitures (9,737) (18,870) (3,227)
Currency translation effect 19,471 (23,881) 61,907
Ending balance 1,906,233 1,655,688 1,630,393
Machinery and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 1,197,349 1,254,469  
Ending balance 1,426,828 1,197,349 1,254,469
Office furniture and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 123,805 100,623  
Ending balance 165,061 123,805 100,623
Computer equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 251,071 219,619  
Ending balance 228,427 251,071 219,619
Transportation equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 12,510 11,663  
Ending balance 18,236 12,510 11,663
Communication equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 13,656 13,943  
Ending balance 12,810 13,656 13,943
Improvements on leased assets [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 57,297 30,076  
Ending balance 54,871 57,297 30,076
Investment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 3,369,500 3,098,352 2,672,140
Additions 632,455 392,506 317,000
Divestitures (81,194) (70,546) (61,993)
Currency translation effect 22,392 (50,812) 171,205
Ending balance 3,943,153 3,369,500 3,098,352
Investment [Member] | Machinery and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 2,268,920 2,181,305 1,907,231
Additions 444,495 175,457 155,957
Divestitures (62,642) (49,970) (16,257)
Currency translation effect 15,759 (37,872) 134,374
Ending balance 2,666,532 2,268,920 2,181,305
Investment [Member] | Office furniture and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 240,898 208,676 174,688
Additions 61,414 40,958 39,878
Divestitures (1,455) (6,427) (14,182)
Currency translation effect 469 (2,309) 8,292
Ending balance 301,326 240,898 208,676
Investment [Member] | Computer equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 710,584 596,652 508,373
Additions 107,381 136,915 90,195
Divestitures (9,104) (12,751) (28,346)
Currency translation effect 5,602 (10,232) 26,430
Ending balance 814,463 710,584 596,652
Investment [Member] | Transportation equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 47,068 42,037 36,847
Additions 13,537 6,650 4,081
Divestitures (3,072) (1,220) (1,000)
Currency translation effect 562 (399) 2,109
Ending balance 58,095 47,068 42,037
Investment [Member] | Communication equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 30,432 28,224 28,528
Additions 1,633 2,386 1,904
Divestitures (911) (178) (2,208)
Ending balance 31,154 30,432 28,224
Investment [Member] | Improvements on leased assets [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 71,598 41,458 16,473
Additions 3,995 30,140 24,985
Divestitures (4,010)    
Ending balance 71,583 71,598 41,458
Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (1,713,812) (1,467,959) (1,116,547)
Additions (391,644) (324,460) (300,880)
Divestitures 71,457 51,676 58,766
Currency translation effect (2,921) 26,931 (109,298)
Ending balance (2,036,920) (1,713,812) (1,467,959)
Accumulated depreciation and amortisation [member] | Machinery and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (1,071,571) (926,836) (681,636)
Additions (221,674) (195,382) (189,241)
Divestitures 55,770 33,308 15,838
Currency translation effect (2,229) 17,339 (71,797)
Ending balance (1,239,704) (1,071,571) (926,836)
Accumulated depreciation and amortisation [member] | Office furniture and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (117,093) (108,053) (100,130)
Additions (20,839) (16,363) (10,238)
Divestitures 1,864 5,641 12,330
Currency translation effect (197) 1,682 (10,015)
Ending balance (136,265) (117,093) (108,053)
Accumulated depreciation and amortisation [member] | Computer equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (459,513) (377,033) (293,648)
Additions (135,272) (101,207) (86,520)
Divestitures 9,054 11,373 27,888
Currency translation effect (305) 7,354 (24,753)
Ending balance (586,036) (459,513) (377,033)
Accumulated depreciation and amortisation [member] | Transportation equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (34,558) (30,374) (23,172)
Additions (8,177) (5,960) (5,469)
Divestitures 3,066 1,220 1,000
Currency translation effect (190) 556 (2,733)
Ending balance (39,859) (34,558) (30,374)
Accumulated depreciation and amortisation [member] | Communication equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (16,776) (14,281) (13,112)
Additions (2,354) (2,629) (2,879)
Divestitures 786 134 1,710
Ending balance (18,344) (16,776) (14,281)
Accumulated depreciation and amortisation [member] | Improvements on leased assets [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (14,301) (11,382) (4,849)
Additions (3,328) (2,919) (6,533)
Divestitures 917    
Ending balance $ (16,712) $ (14,301) $ (11,382)