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Machinery, Equipment and Improvements on Leased Assets - Summary of Net Balances of Machinery, Equipment and Improvements on Leased Assets (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property plant and equipment $ 1,906,233 $ 1,655,688 $ 1,630,393 $ 1,555,593
Machinery and equipment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property plant and equipment 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]        
Property plant and equipment 165,061 123,805 100,623  
Computer equipment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property plant and equipment 228,427 251,071 219,619  
Transportation equipment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property plant and equipment 18,236 12,510 11,663  
Communication equipment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property plant and equipment 12,810 13,656 13,943  
Improvements on leased assets [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Property plant and equipment $ 54,871 $ 57,297 $ 30,076