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Finance Cost - Net - Summary of Net Finance (Cost) Income (Detail) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Finance Income Expense [Abstract]      
Interest income from cash equivalents $ 354,439 $ 182,426 $ 81,489
Interest on recovered taxes 8,791 16,199 3,465
Gain on derivative financial investments 34,361 68,261  
Other 23,144 12,684 5,935
Total interest income 420,735 279,570 90,889
Interest cost from bank loans (124,438) (107,680) (71,881)
Loss on financial investments held for trading purposes   (2) (242)
Commissions for bank loans (32)   (1,901)
Other financing costs (18,362) (24,620) (8,594)
Interest cost for debt securities (476,375) (249,406) (126,686)
Total interest expense (619,207) (381,708) (209,304)
Foreign exchange gains 1,025,183 759,965 222,292
Foreign exchange loss (926,100) (1,260,859) (560,687)
Foreign exchange gains (loss) - Net 99,083 (500,894) (338,395)
Finance cost - Net $ (99,389) $ (603,032) $ (456,810)