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Investment in associate - Schedule of Associate of Company (Detail) - SCL Terminal Aerea De Santiago S. A. [Member]
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Significant Investments In Associates [Line Items]      
Percentage of stake by the company 14.77% 14.77% 14.77%
CHILE      
Disclosure Of Significant Investments In Associates [Line Items]      
Name of associate SCL Terminal Aérea de Santiago, S. A.    
Place of constitution and operation Santiago de Chile, Chile    
Percentage of stake by the company 14.77%