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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2017
Cash And Cash Equivalents [Abstract]  
Summary of Cash and Cash Equivalents

As of December 31, 2015, 2016 and 2017, the balances are comprised of the following:

 

 

 

December 31,

2015

 

 

December 31,

2016

 

 

December 31,

2017

 

Cash

 

Ps.

 

1,171,725

 

 

Ps.

 

1,560,536

 

 

Ps.

 

1,616,408

 

Investments of cash surpluses

 

 

 

1,824,774

 

 

 

 

3,326,662

 

 

 

 

5,855,824

 

Cash equivalents designated for expenditure, held in trust

 

 

 

—

 

 

 

 

300,940

 

 

 

 

257,911

 

 

 

Ps.

 

2,996,499

 

 

Ps.

 

5,188,138

 

 

Ps.

 

7,730,143