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Financial Risk Management - Summary of Company's Contractual Maturities for its Financial Liabilities, Including the Interest to be Paid (Detail) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities $ 730,361 $ 784,533 $ 693,099
Fixed Rate Interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Weighted average of effective interest rate 9.83% 9.85% 9.85%
Variable rate interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Weighted average of effective interest rate 6.91% 5.83% 4.73%
Contractual maturities [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities $ 17,815,500 $ 17,455,791 $ 12,385,582
Contractual maturities [Member] | AMP [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 298,376 252,622 198,512
Contractual maturities [Member] | Trade accounts payable [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 730,361 784,533 693,099
Contractual maturities [Member] | Long-term debt securities (fixed rate) [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 1,500,000 1,500,000 1,500,000
Contractual maturities [Member] | Long-term debt securities (variable rate) [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 7,500,000 7,500,000 3,700,000
Contractual maturities [Member] | Variable rate bank loans [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 4,310,556 3,990,980 4,331,680
Contractual maturities [Member] | Fixed rate bank loans [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 225,307 261,278 282,596
Contractual maturities [Member] | Fixed Rate Interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 1,084,954 810,672 930,486
Contractual maturities [Member] | Variable rate interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 2,165,946 2,355,706 749,209
1 to 30 Days Past Due [Member] | Contractual maturities [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 256,859 255,290 378,984
1 to 30 Days Past Due [Member] | Contractual maturities [Member] | Trade accounts payable [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 189,894 200,056 358,587
1 to 30 Days Past Due [Member] | Contractual maturities [Member] | Fixed rate bank loans [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities   694 667
1 to 30 Days Past Due [Member] | Contractual maturities [Member] | Fixed Rate Interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 2,664 232 3,104
1 to 30 Days Past Due [Member] | Contractual maturities [Member] | Variable rate interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 64,301 54,308 16,626
From 1 to 3 months [Member] | Contractual maturities [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 724,487 837,825 381,300
From 1 to 3 months [Member] | Contractual maturities [Member] | Trade accounts payable [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 540,467 584,477 334,512
From 1 to 3 months [Member] | Contractual maturities [Member] | Variable rate bank loans [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities   73,021  
From 1 to 3 months [Member] | Contractual maturities [Member] | Fixed rate bank loans [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities   1,403 2,027
From 1 to 3 months [Member] | Contractual maturities [Member] | Fixed Rate Interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 56,198 54,138 6,398
From 1 to 3 months [Member] | Contractual maturities [Member] | Variable rate interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 127,822 124,786 38,363
Less than 1 month [Member] | Contractual maturities [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 996,564 894,557 552,647
Less than 1 month [Member] | Contractual maturities [Member] | AMP [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 298,376 252,622 198,512
Less than 1 month [Member] | Contractual maturities [Member] | Variable rate bank loans [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities   59,688 76,457
Less than 1 month [Member] | Contractual maturities [Member] | Fixed rate bank loans [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities   6,548 5,608
Less than 1 month [Member] | Contractual maturities [Member] | Fixed Rate Interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 79,990 55,470 109,563
Less than 1 month [Member] | Contractual maturities [Member] | Variable rate interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 618,198 520,229 162,507
Between 1 and 5 years [Member] | Contractual maturities [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 13,608,013 13,473,761 8,960,283
Between 1 and 5 years [Member] | Contractual maturities [Member] | Long-term debt securities (variable rate) [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 7,500,000 7,500,000 3,700,000
Between 1 and 5 years [Member] | Contractual maturities [Member] | Variable rate bank loans [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 4,200,331 3,858,271 4,255,223
Between 1 and 5 years [Member] | Contractual maturities [Member] | Fixed rate bank loans [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities   26,725 37,756
Between 1 and 5 years [Member] | Contractual maturities [Member] | Fixed Rate Interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 555,088 432,382 435,591
Between 1 and 5 years [Member] | Contractual maturities [Member] | Variable rate interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 1,352,594 1,656,383 531,713
More than 5 years [Member] | Contractual maturities [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 2,229,577 1,994,358 2,112,368
More than 5 years [Member] | Contractual maturities [Member] | Long-term debt securities (fixed rate) [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 1,500,000 1,500,000 1,500,000
More than 5 years [Member] | Contractual maturities [Member] | Variable rate bank loans [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 110,225    
More than 5 years [Member] | Contractual maturities [Member] | Fixed rate bank loans [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 225,307 225,908 236,538
More than 5 years [Member] | Contractual maturities [Member] | Fixed Rate Interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities 391,014 $ 268,450 $ 375,830
More than 5 years [Member] | Contractual maturities [Member] | Variable rate interest [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities $ 3,031