Financial risk management (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Financial Instruments [Abstract]

Summary of Financial Instruments Held by the Company

At December 31, 2015, 2016 and 2017, financial instruments held by the Company are comprised of the following:

	December 31, 2015			December 31, 2016			December 31, 2017
Financial assets
Cash and cash equivalents	Ps.	2,996,499		Ps.	5,188,138		Ps.	7,730,143
Receivables			159,196			607,544			997,370
Derivative financial instruments			—			72,454			106,815
Financial liabilities at amortized cost
Long-term debt securities	Ps.	2,600,000		Ps.	5,200,000		Ps.	9,000,000
Current and long term bank loans			3,950,465			4,614,276			4,252,258
Accounts payable			586,875			891,611			1,037,155

Summary of Company's Contractual Maturities for its Financial Liabilities, Including the Interest to be Paid

Following is a table with a summary of the Company’s contractual maturities for its financial liabilities, including the interest to be paid, as of December 31, 2015, 2016 and 2017:

	December 31, 2015
	Weighted average of effective interest rate			Less than 1 month			From 1 to 3 months			From 3 months to 1 year			From 1 year to 5 years			More than 5 years			Total
Long-term debt securities (fixed rate)				Ps.		—	Ps.		—	Ps.		—	Ps.		—	Ps.		1,500,000	Ps.		1,500,000
Long-term debt securities (variable rate)						—			—			—			1,100,000			—			1,100,000
Fixed rate loans						516			1,569			201,860			31,709			5,529			241,183
Variable rate bank loans						—			3,286,442			38,715			358,316			25,809			3,709,282
Fixed rate interest		9.85	%			1,405			5,949			128,836			436,654			483,357			1,056,201
Variable rate interest		3.62	%			5,485			7,014			42,028			160,328			—			214,855
Trade accounts payable	N/A					196,757			240,481			—			—			—			437,238
AMP	N/A					—			—			149,637			—			—			149,637
				Ps.	204,163		Ps.	3,541,455		Ps.	561,076		Ps.	2,087,007		Ps.	2,014,695		Ps.	8,408,396

	December 31, 2016
	Weighted average of effective interest rate			Less than 1 month			From 1 to 3 months			From 3 months to 1 year			From 1 year to 5 years			More than 5 years			Total
Long-term debt securities (fixed rate)				Ps.		—	Ps.		—	Ps.		—	Ps.		—	Ps.	1,500,000		Ps.	1,500,000
Long-term debt securities (variable rate)						—			—			—			3,700,000			—			3,700,000
Fixed rate loans						667			2,027			5,608			37,756			236,538			282,596
Variable rate bank loans						—			—			76,457			4,255,223			—			4,331,680
Fixed rate interest		9.85	%			3,104			6,398			109,563			435,591			375,830			930,486
Variable rate interest		4.73	%			16,626			38,363			162,507			531,713			—			749,209
Trade accounts payable	N/A					358,587			334,512			—			—			—			693,099
AMP	N/A					—			—			198,512			—			—			198,512
				Ps.	378,984		Ps.	381,300		Ps.	552,647		Ps.	8,960,283		Ps.	2,112,368		Ps.	12,385,582

	December 31, 2017
	Weighted average of effective interest rate			Less than 1 month			From 1 to 3 months			From 3 months to 1 year			From 1 year to 5 years			More than 5 years			Total
Long-term debt securities (fixed rate)				Ps.		—	Ps.		—	Ps.		—	Ps.		—	Ps.	1,500,000		Ps.	1,500,000
Long-term debt securities (variable rate)						—			—			—			7,500,000			—			7,500,000
Fixed rate loans						694			1,403			6,548			26,725			225,908			261,278
Variable rate bank loans						—			73,021			59,688			3,858,271			—			3,990,980
Fixed rate interest		9.85	%			232			54,138			55,470			432,382			268,450			810,672
Variable rate interest		5.83	%			54,308			124,786			520,229			1,656,383			—			2,355,706
Trade accounts payable	N/A					200,056			584,477			—			—			—			784,533
AMP	N/A					—			—			252,622			—			—			252,622
				Ps.	255,290		Ps.	837,825		Ps.	894,557		Ps.	13,473,761		Ps.	1,994,358		Ps.	17,455,791

Summary of Sensitivity Analysis of the Company Financial Assets and Liabilities

Following is a sensitivity analysis of the Company financial assets and liabilities denominated in USD, if the peso were to depreciate or appreciate by 10%, which is the amount management considers reasonably possible of occurring at year end:

	USD amounts at December 31, 2017				Peso amounts at exchange rate of Ps. 19.7354 at December 31, 2017				Peso amounts if exchange rate would depreciate 10%				Peso amounts if exchange rate would appreciate 10%
Thousands of U.S. dollars:
Financial assets:
Cash and cash equivalents		81,530		Ps.		1,609,022		Ps.		1,769,920		Ps.		1,462,749
Trade accounts receivable		10,663				210,431				231,473				191,300
		92,193				1,819,453				2,001,393				1,654,049
Financial liabilities:
Accounts payable		(27,117	)			(535,166	)			(588,681	)			(486,515	)
Bank loans		(215,464	)			(4,252,258	)			(4,677,476	)			(3,865,695	)
Net liability position		(150,388	)	Ps.		(2,967,971	)	Ps.		(3,264,764	)	Ps.		(2,698,161	)

Summary of Variable Interest Rates to the Company is Exposed had been 100 Basis Points (Higher) or Lower Than the Interest Rate

The Company has financial debt denominated in pesos and U.S. dollars, which accrues interest at a variable rate based on TIIE 28-days, LIBOR 30-days in Mexico and LIBOR in MBJA, respectively. If the date of year end 2017, variable interest rates to which the Company is exposed had been 100 basis points (higher) or lower than the interest rate at year-end with the other variables remaining constant, the effect on net income and shareholders’ equity for the years ended December 31, 2015, 2016 and 2017 would be as follows:

	2015			2016			2017
Effect in case of interest rate increase in 100 basis points
Variable rate long term debt	Ps.	(40,370	)	Ps.	(64,031	)	Ps.	(112,134	)
Effect in case of interest rate decrease in 100 basis points
Variable rate long term debt	Ps.	40,370		Ps.	64,031		Ps.	112,134

Summary of Ratio of the Shareholders' Equity to Total Liabilities

Following is the ratio of shareholders’ equity to total liabilities of the Company at the end of the reporting period:

	2015		2016		2017
Stockholders’ equity –controlling interest	Ps.	21,273,951	Ps.	21,333,015	Ps.	21,028,215
Total liabilities		9,317,356		13,646,893		17,440,763
Ratio of total stockholders’ equity to liabilities		2.3		1.6		1.2