Grupo TMM, S.A.B. (GTMAY) 20-F 30 Apr 19 2018 FY Annual report (foreign) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2018shares
Document and Entity Information [Abstract]
Entity Registrant Name	GRUPO TMM SAB
Entity Central Index Key	0001163560
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding	102,182,841
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY

Consolidated statements of fina

Consolidated statements of financial position - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current
Cash and cash equivalents (Note 5)	$ 278,842	$ 422,083
Restricted cash (Note 5)	39,313	39,471
Trade receivables, net (Note 6)	248,183	250,637
Other accounts receivable (Note 7)	410,434	319,193
Related parties (Note 15)	207,964	217,188
Materials and supplies	56,621	58,061
Prepayments	24,873	11,527
Total current assets	1,266,230	1,318,160
Non-current
Property, vessels and equipment, net (Note 9)	2,313,437	2,623,535
Intangible assets (Note 12)	126,437	127,890
Concession rights, net (Note 10)	9,459	13,244
Other non-current assets (Note 11)	65,521	41,383
Total non-current assets	2,514,854	2,806,052
Total assets	3,781,084	4,124,212
Short-term
Short-term portion of the financial debt (Note 14)	223,362	502,361
Trade payables	262,090	169,072
Accounts payable and accrued expenses (Note 16)	357,523	341,918
Related parties (Note 15)	18,379	34,756
Total short-term liabilities	861,354	1,048,107
Long-term
Long-term portion of the financial debt (Note 14)	392,063	396,257
Employee benefits (Note 23)	176,606	175,560
Deferred income tax (Note 21)	226,803	275,226
Total long-term liabilities	795,472	847,043
Total liabilities	1,656,826	1,895,150
Stockholders' equity (Note 17):
Share capital (103,760,541 shares authorized and issued)	2,216,733	2,216,733
Treasury shares (1,577,700 shares)	(46,805)	(46,805)
Other components of equity	706,944	849,466
Accumulated losses	(799,818)	(859,159)
Controlling interest	2,077,054	2,160,235
Non-controlling interest	47,204	68,827
Total stockholders' equity	2,124,258	2,229,062
Total liabilities and stockholders' equity	$ 3,781,084	$ 4,124,212

Consolidated statements of fi_2

Consolidated statements of financial position (Parenthetical) - shares	Dec. 31, 2018	Dec. 31, 2017
Stockholders' equity
Common stock, shares authorized (in shares)	103,760,541	103,760,541
Common stock, shares issued (in shares)	103,760,541	103,760,541
Treasury shares (in shares)	1,577,700	1,577,700

Consolidated statements of prof

Consolidated statements of profit or loss - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated statements of profit or loss [Abstract]
Revenue from transportation	$ 1,523,066	$ 2,464,939	$ 2,647,484
Costs and expenses:
Salaries, wages and employee benefits	368,614	571,775	639,913
Leases	436,469	622,908	621,990
Contracted services	413,060	545,541	550,287
Fuel, materials and supplies	211,793	317,525	218,960
Depreciation, amortization and loss from revaluation	80,277	562,915	555,244
Other costs and expenses	17,221	22,231	23,232
Total costs and expenses	1,527,434	2,642,895	2,609,626
Transportation (loss) profit	(4,368)	(177,956)	37,858
Other income, net (Note 19)	102,625	3,217,746	52,870
Operating income	98,257	3,039,790	90,728
Comprehensive financing cost:
Interest income	9,137	24,829	24,719
Interest expense and other financial costs (Note 20)	(84,890)	(1,210,486)	(869,267)
Exchange gain (loss), net	5,844	(7,822)	(21,359)
Total comprehensive financing cost	(69,909)	(1,193,479)	(865,907)
Profit (loss) before taxes	28,348	1,846,311	(775,179)
Income tax (expense) benefit (Note 21)	(4,799)	(516,732)	268,615
Net profit (loss) for the year	23,549	1,329,579	(506,564)
Attributable to:
Non-controlling interest	4,543	1,989	1,480
Controlling interest	$ 19,006	$ 1,327,590	$ (508,044)
Profit (loss) per share for the year (Note 24)
Profit (loss) per share for the year	$ 0.186	$ 12.992	$ (4.972)
Weighted average number of shares for the year (in shares)	102,182,841	102,182,841	102,182,841

Consolidated statements of comp

Consolidated statements of comprehensive income - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated statements of comprehensive income [Abstract]
Net profit (loss) for the year	$ 23,549	$ 1,329,579	$ (506,564)
Items that will not be subsequently reclassified to profit or loss
Actuarial gains, net (Note 23)	15,430	319	24,863
Revaluation surplus (Note 25)	(161,411)	941,957	424,634
Income tax on other comprehensive income	43,794	(282,683)	(134,849)
Total of other comprehensive income for the year	(102,187)	659,593	314,648
Comprehensive (loss) income for the year	(78,638)	1,989,172	(191,916)
Attributable to:
Non-controlling interest	4,543	1,989	1,480
Controlling interest	$ (83,181)	$ 1,987,183	$ (193,396)

Consolidated statements of chan

Consolidated statements of changes in stockholders' equity - MXN ($) $ in Thousands	Total	Share Capital [Member]	Treasury Shares [Member]	Mandatory Convertible Debentures Into Shares [Member]	Accumulated Losses [Member]	Other Components of Equity [Member]	Subtotal [Member]	Non Controlling Interest [Member]	Number of Outstanding Common Shares [Member]
Balance, beginning of period at Dec. 31, 2015	$ 431,806	$ 2,216,733	$ (46,805)	$ 0	$ (3,902,996)	$ 2,099,516	$ 366,448	$ 65,358
Balance, beginning of period (in shares) at Dec. 31, 2015									102,182,841
Net income (loss) for the year	(506,564)	0	0	0	(508,044)	0	(508,044)	1,480
Other comprehensive income	314,648	0	0	0	151,056	163,592	314,648	0
Comprehensive income (loss) for the year	(191,916)	0	0	0	0	0	(193,396)	1,480
Equity portion of mandatorily convertible debentures into shares	724,100	0	0	724,100	0	0	724,100	0
Balance, end of period at Dec. 31, 2016	963,990	2,216,733	(46,805)	724,100	(4,259,984)	2,263,108	897,152	66,838
Balance, end of period (in shares) at Dec. 31, 2016									102,182,841
Net income (loss) for the year	1,329,579	0	0	0	1,327,590	0	1,327,590	1,989
Other comprehensive income	659,593	0	0	0	2,073,235	(1,413,642)	659,593	0
Comprehensive income (loss) for the year	1,989,172	0	0	0	0	0	1,987,183	1,989
Cancellation of mandatorily convertible debentures into shares	(724,100)	0	0	(724,100)	0	0	(724,100)	0
Balance, end of period at Dec. 31, 2017	$ 2,229,062	2,216,733	(46,805)	0	(859,159)	849,466	2,160,235	68,827
Balance, end of period (in shares) at Dec. 31, 2017	102,182,841								102,182,841
Net income (loss) for the year	$ 23,549	0	0	0	19,006	0	19,006	4,543
Other comprehensive income	(102,187)	0	0	0	40,335	(142,522)	(102,187)	0
Comprehensive income (loss) for the year	(78,638)	0	0	0	0	0	(83,181)	4,543
Dividends paid to non-controlling interests	(26,166)	0	0	0	0	0	0	(26,166)
Balance, end of period at Dec. 31, 2018	$ 2,124,258	$ 2,216,733	$ (46,805)	$ 0	$ (799,818)	$ 706,944	$ 2,077,054	$ 47,204
Balance, end of period (in shares) at Dec. 31, 2018	102,182,841								102,182,841

Consolidated statements of cash

Consolidated statements of cash flow - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Cash flows from operating activities:
Profit (loss) before taxes	$ 28,348		$ 1,846,311		$ (775,179)
Adjustments to reconcile the profit (loss) with cash used in operating activities:
Depreciation, amortization and loss from revaluation	80,277		562,915		555,244
Other amortizations	5,259		84,615		76,020
Loss (gain) from the sale of property, vessels and equipment, net	1,849		(330)		(56,491)
Accrued interests	80,580		1,039,856		783,458
Interest income	(9,137)		(24,829)		(24,719)
Gain from the loss of control of subsidiary	0		(3,458,467)		0
Exchange (gain) loss	(8,312)		(4,545)		69,826
Loss (gain) from the sale of subsidiaries	(111,484)	[1]	273,032	[1]	0
Changes in assets and liabilities:
Accounts receivable	2,454		7,924		267,891
Other accounts receivable and related parties	(98,394)		(150,154)		(54,580)
Materials and supplies	1,440		(38,936)		(3,845)
Prepayments	(13,346)		3,753		6,403
Other accounts payable and accrued expenses	117,065		162,094		(247,901)
Other non-current assets	(22,685)		42,269		36,971
Employee benefits	1,046		11,353		(47,035)
Total adjustments	26,612		(1,489,450)		1,361,242
Cash from operating activities	54,960		356,861		586,063
Cash from investment activities
Proceeds from sale of property, vessels and equipment	169,627		7,059		87,720
Acquisition of property, vessels and equipment	(86,283)		(80,222)		(162,072)
Proceeds from sale of subsidiaries	50,331		66,987		0
Decrease of cash and cash equivalents from the loss of control of subsidiary (TMM DM)	0		(212,332)		0
Dividends paid to non-controlling interests	(26,166)		0		0
Interest charged	9,137		24,829		24,719
Cash from (used in) investment activities	116,646		(193,679)		(49,633)
Cash flow from financing activities
Debt contracted	124,010		0		166,509
Debt payments	(397,458)		(172,592)		(173,439)
Interest paid	(40,792)		(409,146)		(737,548)
Cash used in financing activities	(314,240)		(581,738)		(744,478)
Exchange effect on cash	(607)		(20,737)		57,884
(Decrease) increase in cash and cash equivalents	(143,241)		(439,293)		(150,164)
Cash and cash equivalents, beginning of year	422,083		861,376		1,011,540
Cash and cash equivalents, end of year	278,842		422,083		861,376
Complementary information:
Income tax paid	$ 4,799		$ 3,000		$ 3,433
[1]	In 2018 and 2017, corresponds to the income from the sale of subsidiaries (see Note 4).

General information

General information	12 Months Ended
	Dec. 31, 2018
General information [Abstract]
General information	1 General information Principal activity Grupo TMM, S.A.B. (‘Grupo TMM’ or the ‘Company’) is a Mexican company whose principal activity is providing multimodal transport and logistics services to premium customers throughout Mexico. Grupo TMM’s shares are listed on the Mexican Stock Exchange and on ‘Over-The-Counter’ market on the New York Stock Exchange in the United States. Grupo TMM’s head office is located at Avenida de la Cúspide N° 4755, Colonia Parques del Pedregal, Delegación Tlalpan, C.P. 14010, Mexico City. In addition, a significant portion of its maritime division activities is conducted at Calle 55 N° 2 Col. Electricistas C.P. 24120 Cd. del Carmen, Campeche. The Company’s activities are grouped together under the following service divisions: • Maritime: • Ports and terminals: • Logistics: • Warehousing: As discussed in Note 4 below, the Stockholders’ Meeting approved its corporate restructuring, which contemplated transferring 85% of the shares of its subsidiary TMM Division Marítima, S.A. de C.V. (‘TMM DM’), one of the main subsidiaries of the Group. Pursuant to the foregoing, Grupo TMM no longer included the assets, liabilities and profit or loss of TMM DM in its consolidated financial statements, which generated a significant reduction in its level of weighting and its financial cost, as well as an improvement in its net income for the year. Moreover, pursuant to a maritime service-rendering contract, Grupo TMM maintains the operation and management of the vessels of TMM DM. The foregoing forms part of the strategic plan of the Group for positioning itself as the best option in maritime transportation and logistics services, through each one of its divisions, by offering high quality services to all participants in the energy sector in our country, by taking advantage of its gradual recovery. Grupo TMM has efficiently implemented customer diversification strategies, reduction of indebtedness, and cost effectiveness, which enables it to adapt to the variable circumstances on the domestic and international markets. Likewise, it continues to develop strategies for improving the performance of its service units. Structure of Grupo TMM At December 31, 2018 and 2017, Grupo TMM holds the percentage of equity interest in various subsidiaries, the most significant are as follows: % of ownership 2018 2017 Maritime Transportación Marítima Mexicana, S.A. de C.V. 100 % 100 % Inmobiliaria Dos Naciones, S. de R.L. de C.V. 100 % 100 % TMM Parcel Tankers, S.A. de C.V. 100 % 100 % Logistics Almacenadora de Depósito Moderno, S.A. de C.V. (Warehouse) 100 % 100 % Autotransportación y Distribución Logística, S.A. de C.V. 100 % 100 % Ports and terminals TMM Logistics, S.A. de C.V. 100 % 100 % Prestadora de Servicios MTR, S.A. de C.V. 100 % 100 % Servicios Administrativos API Acapulco, S.A. de C.V. 51 % 51 % Administración Portuaria Integral de Acapulco S.A. de C.V. 51 % 51 % Payroll outsourcing Mexschiff Operación de Personal, S.A.P.I. de C.V. 100 % 100 % Omexmar Operadora Mexicana Marítima, S.A.P.I. de C.V. 100 % 100 % Perhafen Services Marítimos, S.A.P.I. de C.V. 100 % 100 % TMM Dirección Corporativa, S.A.P.I. de C.V. 100 % 100 % Perjomar Operadora, S.A.P.I. de C.V. 44 % 44 % Property leasing Inmobiliaria TMM, S.A. de C.V. 100 % 100 % TMM División Marítima, S.A. de C.V. (‘TMM DM’) was one of the main subsidiaries of Grupo TMM, until the date of loss of control mentioned in Note 4 below. The Company’s subsidiaries are incorporated in Mexico, where most of their activities take place. Non-controlling interest in subsidiaries Grupo TMM holds equity interest in the subsidiaries Administración Portuaria Integral de Acapulco, S.A. de C.V., Servicios Administrativos API Acapulco, S.A. de C.V., and Perjomar Operadora, S.A.P.I. de C.V., for which there is non-controlling interest, associated effect on the Company’s consolidated financial statements is considered immaterial. These companies are established and conduct their activities in Mexico.

Changes in accounting policies

Changes in accounting policies	12 Months Ended
	Dec. 31, 2018
Changes in accounting policies [Abstract]
Changes in accounting policies	2 Changes in accounting policies New Standards adopted as at 1 January 2018 IFRS 15 ‘Revenue from Contracts with customers’ IFRS 15 ‘Revenue from Contracts with Customers’ and the related ‘Clarifications to IFRS 15 Revenue from Contracts with Customers’ (hereinafter referred to as ‘IFRS 15’) replace IAS 18 ‘Revenue’,IAS 11 ‘Construction Contracts’, and several revenue-related Interpretations. The new Standard has been applied retrospectively without restatement, with the cumulative effect of initial application recognized as an adjustment to the opening balance of retained earnings at 1 January 2018; nevertheless, as described following there were no adjustments due to the adoption. In accordance with the transition guidance, IFRS 15 has only been applied to contracts that are incomplete as at 1 January 2018. In connection with the revenue recognition of the Group, the main considerations in the adoption of IFRS 15 were: • Specialized maritime: • Ports and terminals • Logistics: • Warehousing: The Group considers contract costs to be immaterial. Moreover, they correspond to contracts for periods of less than one year. Toward that end, the Company recognizes these costs in income as incurred. The foregoing is consistent with the accounting treatment under the above standards. None of the revenue transactions qualifies to be considered a series of goods or services, insofar as the transfer pattern is not the same because the services vary based on the type of shipment, characteristics of the products transported or stored, services by type of shipment, formalities in port or repairs, as appropriate. None of the service contracts meets the characteristics to be combined with other contracts. Finally, as at the opening date of application, the Group has not identified liabilities for unsatisfied performance obligations. There are contractual assets where the Group has met the performance obligation before receiving the corresponding consideration. The foregoing is consistent with the foregoing journal entries, and only contract asset balances were reclassified that had previously been included in the trade accounts receivable balance. Moreover, no loss contracts were identified in accordance with the contracts evaluated by the Group. The remaining effects concern matters of disclosure in the notes to the consolidated financial statements. IFRS 9 ‘Financial Instruments’ IFRS 9 replaces IAS 39 ‘Financial Instruments: Recognition and Measurement’. It makes major changes to the previous guidance on the classification and measurement of financial assets and introduces an ‘expected credit loss’ model for the impairment of financial assets. When adopting IFRS 9, the Group has applied transitional relief and opted not to restate prior periods. Pursuant to the analysis performed by the Group, adoption of this standard did not have any effect on the recognition and measurement of its financial instruments, with regard to the accounting policies for financial instruments of the Group, based on the above applicable standards. The main effects correspond to matters concerning classification and disclosures in the notes to the consolidated financial statements. In connection with the financial assets of the Group, the main considerations in the adoption of IFRS 9 were: • the classification and measurement of financial assets of the Group. • impairment of financial assets by applying the expected credit loss model There have been no changes to the classification or measurement of financial liabilities as a result of the application of IFRS 9. Standards, amendments and Interpretations to existing Standards that are not yet effective and have not been adopted early by the Group At the date of authorization of these financial statements, several new, but not yet effective, Standards, amendments to existing Standards, and Interpretations have been published by the Management anticipates that all relevant pronouncements will be adopted for the first period beginning on or after the effective date of the pronouncement. New Standards, amendments and Interpretations neither adopted nor listed below have not been disclosed as they are not expected to have a material impact on the Group’s financial statements, except for IFRS 16 ‘Leases’, which is described below. IFRS 16 ‘Leases’ IFRS 16 will replace IAS 17 ‘Leases’ and three related Interpretations. It completes the IASB’s long-running project to overhaul lease accounting. Leases will be recorded in the statement of financial position in the form of a right-of-use asset and a lease liability. There are two important reliefs provided by IFRS 16 for assets of low value and short-term leases of less than 12 months. IFRS 16 is effective from periods beginning on or after 1 January 2019. Early adoption is permitted; however, the Group have decided not to early adopt. Management is in the process of evaluating the total impact of this standard. So far, the Group: • has decided to use the practical expedient for not performing a complete review of existing leases and applying IFRS 16 only to new or modified contracts. Leases that will be modified or renewed in 2019 are considered immaterial, and it is estimated that an exemption may be applied to low-value assets or short-term leases; • considers that the most significant impact will be that the Group will have to recognize a right-of-use asset and a lease liability for the offices and certain operating equipment (tow-trucks) that are currently treated as operating leases. As at December 31, 2018, future minimum lease payments amount to $46.1 million dollars. This means that the nature of the expense will change from being an operating lease expense to depreciation and interest expense; and • it concludes that there will not be any significant impact on the financial lease that is currently maintained in the statement of financial position. The Group is planning to adopt IFRS 16 on 1 January 2019 using the Standard’s modified retrospective approach. Under this approach the cumulative effect of initially applying IFRS 16 is recognized as an adjustment to equity at the date of initial application. Comparative information is not restated. Choosing this transition approach results in further policy decisions the Group need to make as there are several other transitional reliefs that can be applied. These relate to those leases previously held as operating leases and can be applied on a lease-by-lease basis. The Group are currently assessing the impact of applying these other transitional reliefs. IFRS 16 has not generated significant changes in the journal entries of the lessors. It is important to note that the lease agreements in which the Group acts as a lessor are immaterial.

Summary of significant accounti

Summary of significant accounting policies	12 Months Ended
	Dec. 31, 2018
Summary of significant accounting policies [Abstract]
Summary of significant accounting policies	3 Summary of significant accounting policies Grupo TMM and its subsidiaries prepare their consolidated financial statements in accordance with International Financial Reporting Standards (‘IFRS’), as issued by the IASB, and these are presented in thousands of Mexican pesos. They have been prepared under the assumption that the Group operates on a going concern basis. The Company has decided to present in its consolidated statements of income a subtotal of ‘Operating income’ which reconciles with the ‘Net profit (loss) of the year’ considering the items of ‘Comprehensive financing cost’ and ‘Income tax (expense) benefit’; with regard to the subtotal of ‘Transportation (loss) profit’, the latter reconciles with the ‘Operating income’ considering the item ‘Other income’. The most significant accounting policies are summarized as follows: 3.1 Basis of consolidation The consolidated financial statements include the accounts of Grupo TMM and those of its subsidiaries. Grupo TMM controls a subsidiary when it is exposed, or has rights, to variable returns resulting from its involvement with the subsidiary and has the ability to affect those returns through its power over the subsidiary. All subsidiaries have the reporting date of “December 31”, for all years reported. The balances and transactions among subsidiaries have been eliminated for the purposes of consolidation, including balances and unrealized gains on transactions between Grupo TMM’s companies. Unrealized losses on the sale of assets among the Group are eliminated in the consolidation and the asset involved is also reviewed for impairment from a group perspective. Accounting policies of subsidiaries have been adjusted where necessary to ensure consistency with the policies adopted by Grupo TMM. Profit or loss and other comprehensive income of subsidiaries acquired or disposed during the year are recognized from the effective date of acquisition, or up to the effective date of disposal, as applicable. Non-controlling interest, presented as part of the stockholders’ equity, represents the portion of the subsidiary’s profit or loss and net assets that are not held by Grupo TMM. The Company attributes the total comprehensive income or loss of the subsidiaries between the owners of the parent and the non-controlling interest based on their respective ownership interests. Associates and joint ventures Associates are all entities over which Grupo TMM has significant influence but not control, generally accompanying a shareholding between 20% and 50% of the voting rights. A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement having rights to the net assets of the arrangement. Investments in associates and joint ventures are accounted by the equity method and are initially recognized at their acquisition cost. The carrying amount of investments in associates and joint ventures is increased or decreased to recognize Grupo TMM’s share of the profit or loss and other comprehensive income of the associate and joint venture, adjusted where necessary to ensure consistency with the accounting policies of Grupo TMM. Unrealized gains on transactions between Grupo TMM and its associates and joint ventures are eliminated to the extent of Grupo TMM’s interest on those entities. When unrealized losses are eliminated, the asset involved is also tested for impairment. 3.2 Business combinations Grupo TMM applies the acquisition method to accounting for business combinations. The consideration transferred by Grupo TMM to obtain control of a subsidiary is calculated as the sum of the fair values on the acquisition-date of the assets transferred, liabilities incurred, and the equity interests issued by Grupo TMM, which includes, accordingly, the fair value of any asset or liability that arises from the contingent consideration arrangement. Acquisition costs are expensed as incurred. Grupo TMM recognizes identifiable assets acquired and liabilities assumed in the business combination independent of whether these were recognized in acquirer’s financial statements prior to the acquisition. Assets acquired and liabilities assumed are generally measured at their acquisition-date fair value. Goodwill is stated after the individual recognition of identifiable intangible assets. It is calculated as the excess of the sum of a) the fair value of the consideration transferred, b) the amount recognized for any non-controlling interest in the entity acquired, and c) the fair value on the acquisition date of any equity interest in the acquire, over the acquisition-date the fair values of the identifiable net assets. If the fair values of the identifiable net assets exceed the sum calculated above, this excess amount (e.g. gain on a bargain purchase) is immediately recognized in profit or loss. 3.3 Foreign currency translation Functional and presentation currency The consolidated financial statements are reported in Mexican pesos, which is also the functional currency of the parent company. Foreign currency balances and transactions Foreign currency transactions are translated into the functional currency of the respective Group entity, using the exchange rates prevailing at the dates of the transactions (spot exchange rate). Foreign exchange gains and losses resulting from the settlement of such transactions and from the measurement of monetary items denominated in foreign currency at year-end exchange rates are recognized in profit or loss. Non-monetary items are not retranslated at year-end and are measured at historical cost (translated using the exchange rates at the transaction date), except for non-monetary items measured at fair value which are translated using the exchange rates at the date when fair value was determined. In the consolidated financial statements of Grupo TMM, all the assets, liabilities, and operations of Grupo TMM’s entities operated in a functional currency other than the Mexican peso (Grupo TMM’s reporting currency) are converted to pesos on consolidation. 3.4 Cash and cash equivalents Cash and cash equivalents comprise cash on hand and demand deposits, together with other highly liquid and short-term investments that are readily convertible into known amounts of cash and which are subject to insignificant risk of change in their value. 3.5 Materials and supplies Materials and supplies, consisting mainly of fuel and items for the maintenance of property, vessels and equipment, are valued at the lower of the average cost and the net realizable value. 3.6 Prepayments Represent prepayments for services that will be received in the future and are amortized in the period when said services are received. 3.7 Property, vessels and equipment Properties and vessels The properties (land and buildings) are measured at fair value, which are determined by external professional valuers every three years or before if the market factors indicate a significant change in the fair value. The last valuation of these assets was in December 2016. The vessels are measured at fair value and at December 31, 2018 and 2017, the revalued amounts were determined using the revenue technique (expected future cash flows). The frequency of the revaluations for this class of assets will be based on the changes of the fair values, meaning when these values significantly differ from their carrying value. The Company has revaluated this class of assets at December 31, 2018 and 2017. The revaluation surplus that is derived from the valuation of properties and vessels is recognized as part of ‘Other comprehensive income items’ and forms part of ‘other capital components’ in stockholders’ investment. A revaluation surplus is credited to income up to an amount equivalent to any revaluation write-down or impairment loss previously recognized income. Any excess is recognized in ‘Other comprehensive income items’ and in stockholders’ equity in the item of ‘Revaluation surplus’. Revaluation write-downs or impairment losses are recognized in ‘Other comprehensive income items’ up to the amount previously recognized on that asset in stockholders’ equity in the item of ‘Revaluation surplus’. Any remaining decrease is recognized in income for the year. Any remaining balance of the revaluation surplus in stockholders’ equity at the time of disposing of the asset that gave rise thereto is reclassified to retained earnings. Moreover, any remaining balance of the revaluation surplus in stockholders’ equity may not be distributed to stockholders. The depreciation of properties and vessels is recognized using the straight-line method to write down its carrying value less its estimated residual value. As no finite useful life for land can be determined, the related carrying amounts are not depreciated. Machinery and equipment Machinery and equipment are stated at construction or acquisition cost, including any cost directly attributable to bringing the assets to the location and condition necessary for them to be capable of operating in the manner intended by Grupo TMM’s Management. Acquisitions through capital leases or charter arrangements with an obligation to purchase are capitalized based on the present value of future minimum payments, recognizing the related liability. Depreciation of machinery and equipment is computed using the straight-line method based on the useful lives of the assets net of the estimated residual value. Recurring maintenance and repair expenditures are charged to operating expenses as incurred. Major repairs to vessels (docks) are capitalized and amortized over the period in which benefits are expected to be received (two to five years for vessels). The material residual values and the estimated useful life are adjusted as necessary, at least once a year. Gains or losses from the disposal of property, vessels and equipment are determined as differences between the disposal proceeds and the carrying amount of the assets and are recognized in profit or loss as part of (‘Other income’), accordingly (see Note 19). Construction in progress Disbursements attributable to construction of assets that are identifiable and may be controlled by the Company are recognized as assets when they meet the following conditions: • it is technically possible to complete the construction of the asset so that it can be available to be used; • management has the intent of completing the asset to use it; • it can be proven that the asset will generate economic benefits in the future; • adequate technical, financial or another type of resources are available to complete the asset; and • the disbursement attributable to the asset during its construction can be determined reliably. 3.8 Intangible assets Recognition of intangible assets Concession rights Concession rights correspond to payments made for the rights to operate assets under concession, which are stated at cost and are amortized over the terms specified in the corresponding agreements. Software Software licenses acquired are capitalized on the basis of costs incurred to acquire and install the specific software. Trademark The trademark acquired in a business combination that qualifies for separate recognition is considered an intangible asset and is recorded at its fair value. Subsequent measuring All finite-lived intangible assets are accounted for using the cost model by which the net capitalized costs of their residual value are amortized using the straight-line method throughout their estimated useful lives, in the case of the concession rights; these are amortized according to the term specified in the corresponding agreement. The residual values and useful lives are reviewed at each reporting date. The trademark is considered an intangible asset with an indefinite life; therefore it is subject to impairment tests annually as described in Note 13. The amortization is included in the consolidated statement of operations as part of the depreciation, amortization, and loss on revaluation item. Subsequent expenditures to preserve software and trademarks are expensed as incurred. 3.9 Impairment testing of long-lived assets For impairment assessment purposes, assets are grouped at the lowest levels for which there are largely independent cash inflows (cash-generating units). As a result, some assets are tested individually for impairment and some are tested at cash-generating unit level. Trademark is allocated to those cash-generating units that are expected to benefit from synergies of a related business combination and represent the lowest level within the Company at which management monitors the trademark. Cash-generating units to which trademark has been allocated (determined by the Grupo TMM’s Management as equivalent to its operating segments) are tested for impairment at least annually. All other individual assets or cash-generating units are tested for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognized for the amount by which the asset’s (or cash-generating unit’s) carrying amount exceeds its recoverable amount, which is the higher of fair value less costs of disposal and value-in-use. To determine the value-in-use, management estimates expected future cash flows from each cash-generating unit and determines a suitable discount rate in order to calculate the present value of those cash flows. The data used for impairment testing procedures are directly linked to the Grupo TMM’s latest approved budget, adjusted as necessary to exclude the effects of future reorganizations and asset enhancements. Discount factors are determined individually for each cash-generating unit and reflect current market assessments of the time value of money and asset-specific risk factors. Impairment losses for cash-generating units reduce first the carrying amount of any goodwill allocated to that cash-generating unit. Any remaining impairment loss is charged pro rata to the other assets in the cash-generating unit. With the exception of the trademark, all assets are subsequently reassessed for indications that an impairment loss previously recognized may no longer exist. An impairment loss is reversed if the asset’s or cash-generating unit’s recoverable amount exceeds its carrying amount. 3.10 Leased assets Financial leases Management applies judgment in considering the substance of a lease agreement. The economic ownership of the leased asset is transferred to the leaseholder if they substantially assume all the risks and rewards related to the ownership of the leased asset. The corresponding asset is then recognized at the start of the lease at the fair value of the leased asset, or if lower, at the present value of the lease payments. A corresponding amount is recognized as a liability for financial leasing, independent of whether some of the lease payments are settled in advance of the lease start date. The corresponding liability decreases by the lease payments net of the financial expenses. The interest component in the lease payment represents a portion of the capital balance outstanding and is recognized in operations as financial costs over the lease period. Notes 3.7 above and 9 describe the depreciation methods and estimated useful lives, respectively, for assets under financial leases. Operating leases All other leases are treated as operating leases. Payments on operating lease agreements are recognized as an expense on a straight-line basis over the lease term. The associated costs, such as maintenance and insurance, are expensed as incurred. 3.11 Financial instruments Recognition and derecognition Financial assets and financial liabilities are recognised when the Group becomes a party to the contractual provisions of the financial instrument. Financial assets are derecognized when the contractual rights to the cash flow from a financial asset expire, or when the financial asset and all the substantial risks and benefits have been transferred. A financial liability is derecognized as extinguished, discharged, canceled, or expired. Classification and initial measurement of financial assets Except for those trade receivables that do not contain a significant financing component and are measured at the transaction price in accordance with IFRS 15, all financial assets are initially measured at fair value, adjusted by transaction costs (where applicable). Financial assets are classified into the following categories: • amortized cost • fair value through profit or loss (FVTPL) • fair value through other comprehensive income (FVOCI). In the periods presented the Group does not have any financial assets categorized as FVTPL or FVOCI. The classification is determined by both: • the Group’s business model for managing the financial asset; and • the contractual cash flow characteristics of the financial asset. All income and expenses relating to financial assets that are recognized in profit or loss are presented within finance costs, finance income or other financial items, except for impairment of trade receivables which is presented within other expenses. Subsequent measurement of financial assets Financial assets at amortized cost Financial assets are measured at amortized cost if the assets meet the following conditions (and are not designated as FVTPL): • they are held within a business model whose objective is to hold the financial assets and collect its contractual cash flows; and • the contractual terms of the financial assets give rise to cash flows that are solely payments of principal and interest on the principal amount outstanding. After initial recognition, these are measured at amortized cost using the effective interest method. Discounting is omitted where the effect of discounting is immaterial. The Group’s cash and cash equivalents, trade and most other receivables fall into this category of financial instruments. Impairment of financial assets IFRS 9’s impairment requirements use more forward-looking information to recognize expected credit losses – the ‘expected credit loss (ECL) model’. This replaces IAS 39’s ‘incurred loss model’. Instruments within the scope of the new requirements included mainly trade receivables, contract assets recognized and measured under IFRS 15 and other receivables. Recognition of credit losses is no longer dependent on the Group first identifying a credit los event. Instead the Group considers a broader range of information when assessing credit risk and measuring expected credit losses, including past events, current conditions, reasonable and supportable forecasts that affect the expected collectability of the future cash flows of the instrument. The Group makes use of a simplified approach in accounting for trade and other receivables as well as contract assets and records the loss allowance as lifetime expected credit losses. These are the expected shortfalls in contractual cash flows, considering the potential for default at any point during the life of the financial instrument. In calculating, the Group uses its historical experience, external indicators and forward-looking information to calculate the expected credit losses using a provision matrix. The Group assess impairment of trade receivables based on the characteristics of the business segment, when appropriate this assessment is made on a collective basis as they possess shared credit risk characteristics they have been grouped based on the days past due. Refer to Note 26, for a detailed analysis of how the impairment requirements of IFRS 9 are applied. Previous financial asset impairment under IAS 39 In the prior year, the impairment of trade receivables was based on the incurred loss model. Individually significant receivables were considered for impairment when they were past due or when other objective evidence was received that a specific counterparty will default. Classification and measurement of financial liabilities As the accounting for financial liabilities remains largely the same under IFRS 9 compared to IAS 39, the Group’s financial liabilities were not impacted by the adoption of IFRS 9. However, for completeness, the accounting policy is disclosed below. The Group’s financial liabilities include borrowings, trade and other payables. Financial liabilities are initially measured at fair value, and, where applicable, adjusted for transaction costs. Subsequently, financial liabilities are measured at amortized cost using the effective interest method. All interest-related charges are included within finance costs or finance income and included in financing costs or financing income. 3.12 Provisions, contingent liabilities and contingent assets Provisions are recognized when the present obligations resulting from a past event will probably lead to an outflow of Grupo TMM economic resources and the amounts can be reliably estimated. Timing or amount of the outflow may still be uncertain. A present obligation arises from a presence of a legal or constructive commitment that has resulted from past events. Provisions are not recognized for future operating losses. Provisions are the estimated amounts required to be expended to settle the present obligation based on the most reliable evidence available at the date of the consolidated financial statements, including the risks and uncertainties associated with the present obligation. Provisions are discounted at their present value, where the time value of money is material. Any reimbursement that Grupo TMM can be virtually certain to collect from a third party regarding an obligation is recognized as a separate asset. However, this asset may not exceed the amount for the related provision. All provisions are reviewed on the issuance of the financial statements and adjusted to reflect the current best estimate. When an outflow of economic resources for present obligations is not probable, this is not recognized as a liability, unless it was assumed in the course of a business combination. Such cases are disclosed as contingent liabilities unless the outflow of resources is remote. 3.13 Taxes on earnings Calculation of current income tax is based on tax rates and tax laws that have been enacted or substantially enacted to the reporting date of the consolidated financial statements. Deferred income tax is determined using the liability method, based on temporary differences arising between the tax basis of assets and liabilities and their carrying amounts in the financial statements. Determination of deferred income tax has considered tax rates that will be effective at the time of reversion of the temporary differences. The income tax expense in the statement of profit or loss includes the sum of the deferred tax, which has not been recognized in other comprehensive income or directly in stockholders’ equity, and the current income tax for the year. Deferred tax assets are recognized to the extent that it is probable that future taxable profit against which temporary differences can be utilized will be available (see Note 21). This is assessed based on the Company’s forecast of future operating results, adjusted for significant items that are reconciled for the taxable income and the limits on the use of tax losses and other tax asset carryforwards. Deferred income tax is provided on temporary differences arising on investments in subsidiaries and associates, except where the timing of the reversal of the temporary difference can be controlled and it is probable that the temporary difference will not reverse in the foreseeable future. 3.14 Statutory employee profit sharing The statutory employee profit sharing is determined applying the rate of 10% on taxable income, adjusted as provided for by the Income Tax Law. The statutory employee profit sharing accrued is considered an ordinary expense associated with employee benefits. 3.15 Post-employment benefits and benefits for short-term employees Post-employment benefits Defined benefit plans The seniority pension to which employees are entitled after 15 years of service and after having retired at the age of 60, are expensed in the years in which the services are rendered (see Note 23). In addition, the Company has pension plans for certain employees who retire after the age of 65 (or early retirement at 60 or 55), in addition to having completed a minimum 15 years of service, which are expensed in the years in which the services are rendered (see Note 23). Under the defined benefits plan, the pension amount an employee will receive upon retirement is determined in reference to the time of service and salary determined for each case based on the plan. The legal obligation of the benefits lies with Grupo TMM, even if the plan’s assets to finance the defined benefits plan are separate. The plan’s assets may include assets specifically designated in a long-term benefit fund. The liability recognized in the consolidated statement of financial position for the defined benefits plans is the present value of the defined benefits obligation (DBO) as of the reporting date less the fair value of the plan assets. Management estimates the DBO annually with the assistance of independent actuaries, based on the standard inflation rate, the salary growth rates, and the mortality rate. The discount factors are determined near the close of each year in reference to the high-quality corporate bonds that are denominated in the currency in which the benefits will be paid and which have maturities similar to the terms of the corresponding pension liability. The net cost for the defined benefits liability period is included in the item ‘Salaries, wages and employee benefits’ in the consolidated statements of profit or loss. Indemnifications Indemnifications that are not substitutive of retirement, paid to personnel who leave the company due to restructuring or any other reason, are charged to the operations for the period when incurred or provisions are created when there is a present obligation of these events, with a probability of an outflow of resources and this obligation can be reasonably estimated. Short-term employee benefits Short-term employee benefits, including vacation entitlement, are current liabilities included in ‘Accounts payable and accrued expenses’, measured at the amount Grupo TMM expects to pay as a result of time not taken; as these liabilities are short-term, they were not discounted as their effect is considered immaterial. 3.16 Stockholders’ equity Common shares are classified as equity. Grupo TMM does not have other equity instruments in addition to its common shares. Incremental costs directly attributable to the issue of new shares or options are shown in equity as a deduction, net of taxes, from the proceeds. Incremental costs directly attributable to the issue of new shares or options are included in the cost of acquisition as part of the purchase consideration. The accumulated losses include all current profits or losses and for previous periods. Other components of equity capital include: • revaluation surplus, including gains from the reevaluation of vessels and properties; • statutory reserve corresponds to the separation of earnings withheld to this reserve; • additional paid-in capital is equivalent to the amount received in excess of the par value of the shares; and • translation result represents the accumulated effect of the change in functional currency. 3.17 Recognition of revenue, costs and expenses, and financing costs Revenues Group’s revenue arises mainly from services of maritime transportation, logistics and warehousing. To determine whether to recognize revenue, the Group follows a 5-step process: 1. Identifying the contract with a customer 2. Identifying the performance obligations 3. Determining the transaction price 4. Allocating the transaction price to the performance obligations 5. Recognizing revenue when/as performance obligation(s) are satisfied. The Group does not carry out transactions that involve different contracts and on which their characteristics must be combined in accordance with IFRS. Moreover, transactions are not usually carried out that involve different services as part of the same contract; therefore, the total price of the transaction for a contract in all cases is allocated to a single performance obligation, based on their relative independent sales prices. The transaction price for contracts does not consider variable payments, except for certain service payments that are not considered significant in connection with the total revenues of the Group, nor are payments in kind, nor amounts collected on behalf of third parties and nor contemplate a financing component. All revenues are recognized over time, as the Group meets performance obligations by transferring the services promised to its customers. When the Company meets a performance obligation before receiving the payment, the Company already recognizes either a contract asset or a receivable in its consolidated statement of financial position, depending upon if something else is required than only passage of time before the consideration becomes due. The Group generally does not receive payments in connection with performance obligations; therefore, contractual liabilities are not required to be recognized. In obtaining these contracts, the Group incurs immaterial incremental costs. Since the amortization period of these costs would be less than one year, if capitalized, and also that those costs are immaterial, the Group makes use of the practical expedient in IFRS 15.94 and expenses them as they incur. Parcel vessels and Bulk Carriers These revenues are derived from the transportation of merchandise through the Group’s own shipments or third parties, usually in periods ranging between 7 and 30 days. The rate is fixed and it is set at the beginning of the contract, based on the space or capacity required by the customer. The performance obligation is met as the merchandise is transported from the point of origin to the destination Revenues are recognized over time on a straight-line basis during the term of each contract. Given that the costs required for rendering the service under these contracts do not vary significantly, that method provides a reasonable representation of the services transferred. The amounts that remain unbilled at the end of the reporting period are presented in the consolidated statement of financial position as contractual assets, since something additional is required in addition to time elapsed in order for those amounts to become due and payable. The Group generally does not receive advances that exceed the amount of obligations met; therefore, contract liability balances are not generated. Maritime administration services They correspond to revenues for services rendered for contracting, operating, and managing shipments, mainly offshore service providers. The rate for these services is determined by applying a 2.85% profit margin to the costs incurred by the Group for rendering services. This percentage is reviewed annually, and it can be increased under certain circumstances, but by applying it beginning the year subsequent to its modification, these services are considered a single performance obligation. Accordingly, the consideration is totally allocated; revenues are recognized over time as the related costs are incurred by applying the corresponding profit margin. The amounts are billed monthly, in accordance with these referred to above; therefore, neither asset balances nor contract liabilities are generally generated. Ship repair services (Shipyard) and containers They correspond to revenues for minor and major repairs and maintenance to ships made at the facilities of the Group (Shipyard), as well as containers of shipping companies and others such as wharfage. The consideration for the services is fixed, and it is determined in the contract based on the work ordered, including materials and replacement parts, which must be realized in an estimated period for the work, which ranges from 2 days up to 60 days for ships, and from 1 day up to 6 days for containers. Wharfage depends on the considerations of the ship from 1 to 365 days, due to the high degree of interdependence among the various elements of these services. They are recorded in the accounting as a single performance obligation. These revenues are recognized over time in conformity with the completion of the services agreed upon. The Group measures its completion toward total compliance of the performance obligation by comparing real hours invested up to the date with the total estimated hours required to perform the repair or

Acquisitions and disposals

Acquisitions and disposals	12 Months Ended
	Dec. 31, 2018
Acquisitions and disposals [Abstract]
Acquisitions and disposals	4 Acquisitions and disposals Year 2018 Disposal of subsidiaries Grupo TMM sold 100% of the shares of the subsidiaries Impact Engine, S.A. de C.V., Talocaan Services, S.A. de C.V., and Ditermax Corporate, S.A. de C.V. to an unrelated third party in 2018. These divestitures form part of the business plan of Grupo TMM, which contemplates focusing its resources and operation in the specialized maritime segment. The gain on the sale of these subsidiaries amounted to $111,484, which is shown in the item of ‘Other income’ in the consolidated statements of income (see Note 19). The value of the net assets of those subsidiaries was immaterial as at the date of the sale. Year 2017 Disposal of subsidiaries As at December 21, 2017, pursuant to the General Extraordinary Stockholders’ Meeting of TMM DM, subsidiary to 100% of Grupo TMM at that date, the stockholders approved a variable capital increase in the amount of $35, equivalent to 42,500,000 Class II Series B registered common shares with no par value shown. This increase was subscribed for and issued in cash by Intercam Banco, S.A., Instituticion de Banca Multiple, Intercam Grupo Financiero (‘Intercam’), on behalf of Management Trust number F/3192 (‘Trust F/3192’), formed by Value Automotriz, S. A. de C. V., in the capacity of Trustor and Intercam as Trustee. Trust F/3192 was created based on the resolutions of the trust certificates Holders’ Meeting held on November 28, 2017, wherein the Holders resolved to transfer 85% of the shares of TMM DM in benefit of the Holders of those trust certificates. Derived from the above, the participation of Grupo TMM was diluted to 15% as of that date, which accounted for the loss of control of that subsidiary. Therefore, beginning on that date, the assets, liabilities, and profit or loss of this subsidiary were no longer included in the consolidated financial statements of Grupo TMM. Finally, since Grupo TMM retains significant influence over TMM DM, the remaining 15% investment is accounted for as an investment in associate (see Note 11). Additionally, during 2017, Grupo TMM sold the subsidiaries Dibacar Servicios, S.A.P.I. de C.V., Darcot Services, S.A. de C.V., Logistica Asociada a su Negocio, S.A. de C.V., STK Logistics, S.A. de C.V., Logistica en Administracion, and Construcciones EDAC, S.A. de C.V. for 100% of its stock, all to an unrelated party. These divestitures form part of the business plan of Grupo TMM, which contemplates focusing its resources and operation in the specialized maritime segment. As at the date of the sale, the carrying value of net assets and the consideration received were as follows: TMM DM Other subsidiaries Total Current assets Cash and cash equivalents $ 212,332 $ - $ 212,332 Trade receivables 537,808 - 537,808 Other current assets 142,956 - 142,956 Total current assets 893,096 - 893,096 Non-current Vessels and equipment, net 7,442,415 - 7,442,415 Other non-current assets 8,530 340,019 348,549 Total assets $ 8,344,041 $ 340,019 $ 8,684,060 Short-term liabilities Trust certificates $ 709,589 - $ 709,589 Other short-term liabilities 439,265 - 439,265 Total short-term liabilities 1,148,854 - 1,148,854 Long-term liabilities Trust certificates 9,731,357 - 9,731,357 Other long-term liabilities 922,297 - 922,297 Total liabilities 11,802,508 - 11,802,508 Total net assets $ (3,458,467 ) 340,019 $ (3,118,448 ) Consideration transferred - (66,987 ) (66,987 ) Investment retained by Grupo TMM - - - (Gain) loss on the disposition of subsidiaries $ (3,458,467 ) $ 273,032 $ (3,185,435 ) The gain derived from the loss of control of TMM DM is shown in the item of ‘Other income’ in the consolidated statement of income (see Note 19); due to the stockholders’ equity deficit of TMM DM, the fair value of the investment in an associate retained by Grupo TMM was determined nil, which is consistent with the subsequent valuation under the equity method. The loss on the sale of other subsidiaries amounted to $273,032, which is shown in the item of ‘Other income’ in the consolidated statements of profit or loss (see Note 19). These divestitures form part of the business plan and financial restructuring of Grupo TMM, which contemplates focusing its resources and operation in the specialized maritime segment, through a more efficient operating structure.

Cash and cash equivalents

Cash and cash equivalents	12 Months Ended
	Dec. 31, 2018
Cash and cash equivalents [Abstract]
Cash and cash equivalents	5 Cash and cash equivalents Cash and cash equivalents at December 31, 2018 and 2017, are summarized as follows: 2018 2017 Cash on hand $ 864 $ 925 Cash at banks 123,950 158,035 Short-term investments (a) 154,028 263,123 Restricted cash 39,313 39,471 $ 318,155 $ 461,554 (a) Includes fix-term deposits (promissory notes) and repurchase/resell agreements with terms up to 3 days. Restricted cash As at December 2018 and 2017, restricted cash represents the amount required to guarantee payments according to the obligations arising from the debt agreements for the acquisition of vessels and guarantee found for the sale of Terminal Marítima de Tuxpan, S.A. de C.V.

Trade receivables

Trade receivables	12 Months Ended
	Dec. 31, 2018
Trade receivables [Abstract]
Trade receivables	6 Trade receivables Trade receivables at December 31, 2018 and 2017, are summarized as follows: 2018 2017 Maritime Tugboats $ 26,149 $ 14,033 Shipyards 18,897 30,015 Offshore vessels 13,542 21,719 Parcel tankers 12,350 14,773 Bulk Carrier 1,017 - Others 182 167 Ports and terminals Shipping agencies 39,877 44,426 Port services 8,843 5,154 Commercial leases 233 434 Logistics, warehousing and other businesses Warehousing 47,695 52,034 Repair of containers 31,142 27,489 Automotive services 446 689 Other businesses 1,163 - Total trade receivables 201,536 210,933 Contract assets 68,950 68,014 Allowance for doubtful accounts (22,303 ) (28,310 ) $ 248,183 $ 250,637 All amounts are short-term. The net carrying value of trade accounts receivables is considered a reasonable approximation to fair value. The movement in the allowance for doubtful accounts is presented below: 2018 2017 Balance as at January 1 $ 28,310 $ 35,353 Receivables written off during the year (468 ) (10,482 ) Disincorporation of TMM DM - (9,311 ) Loss allowance (reversed) recognized during the year (5,539 ) 12,750 Balance as at December 31 $ 22,303 $ 28,310 Note 26 includes disclosures related to credit risk exposures and the analysis related to the allowance for expected credit losses. The impairment loss in 2017 was made by applying the incurred loss analysis in conformity with IAS 39, whereas it applied the expected loss model in accordance with IFRS 9 in the current year.

Other accounts receivable

Other accounts receivable	12 Months Ended
	Dec. 31, 2018
Other accounts receivable [Abstract]
Other accounts receivable	7 Other accounts receivable Other accounts receivable at December 31, 2018 and 2017, are summarized as follows: 2018 2017 Recoverable taxes $ 183,927 $ 175,268 Services for port, maritime and other operations 161,037 97,328 Insurance claims 12,286 958 Employees 4,466 8,561 Others 48,718 37,078 $ 410,434 $ 319,193

Leases

Leases	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Leases	8 Leases Financial leases as lessee The Company has a ship named ‘Subsea 88’ under a financial lease, which started in November 2013 and will terminate in October 2023. As of December 31, 2018 and 2017, the carrying value of equipment in finance leases amounts $191,377 and $413,298, respectively. The financial leasing liabilities are secured by the associated assets held under this modality. The minimum future financial leasing payments at the end of each reporting period are: Within the 1st year 1 to 3 years 3 to 5 years After 5 Years Total Balance at December 31, 2018 Lease payments $ 46,055 $ 79,029 $ 174,541 $ - $ 299,625 Financial charges (31,300 ) (46,290 ) (49,294 ) - (126,884 ) Present values, net $ 14,755 $ 32,739 $ 125,247 $ - $ 172,741 Within the 1st year 1 to 3 years 3 to 5 years After 5 Years Total Balance at December 31, 2017 Lease payments $ 39,619 $ 79,346 $ 96,999 $ 117,860 $ 333,824 Financial charges (28,665 ) (51,346 ) (58,456 ) (12,925 ) (151,391 ) Present values, net $ 10,954 $ 28,000 $ 38,543 $ 104,935 $ 182,433 The financial lease contract for ‘Subsea 88’ includes monthly lease payments and an option to buy at the end of the term. Operating leases as lessee At December 31, 2018, the operating leases report the following expiries: Leased assets Expire Building Apr. 2029 Cranes Jul. 2020 Major vessel maintenance Mar. 2020 Lift truck Dec. 2019 Computer equipment Oct. 2021 The contracts include an option to buy at certain times during the term or on expiry. The minimum future payments on operating leases are: Within the 1st year 1 to 3 years 3 to 5 years After 5 Years Total Lease payments At December 31, 2018 $ 82,836 $ 154,026 $ 169,440 $ 527,583 $ 933,885 At December 31, 2017 $ 77,589 $ 143,067 $ 158,278 $ 617,718 $ 996,652

Property, vessels and equipment

Property, vessels and equipment	12 Months Ended
	Dec. 31, 2018
Property, vessels and equipment [Abstract]
Property, vessels and equipment	9 Property, vessels and equipment Property, vessels and equipment at December 31, 2018 and 2017 are summarized as follows: 2018 Net balances at year start Additions Disposals Transfers and others Depreciation / loss from revaluation Net balances at year end Estimated useful lives (years) Vessels $ 1,118,250 $ 260 $ 125,019 (c) $ (162,962 ) (a) and (e) $ 47,856 $ 782,673 25 Shipyard 318 - - - 43 275 40 Major vessel maintenance 12,608 38,142 - 4,064 13,203 41,611 2.5 Buildings and facilities 242,204 5,732 - 604 9,639 238,901 20 y 25 Warehousing equipment 647 - 9 - 383 255 10 Computer equipment 556 459 - 47 481 581 3 y 4 Terminal equipment 6,885 2,252 - (125 ) 1,622 7,390 10 Ground transportation equipment 3,751 2,052 1,153 1,940 1,224 5,366 4,5 y 10 Other equipment 7,641 361 - 313 1,236 7,079 1,392,860 49,258 126,181 (156,119 ) 75,687 1,084,131 Land 1,184,427 - 45,295 (d) 7,120 - 1,146,252 Construction in progress 46,248 37,025 - (219 ) - 83,054 $ 2,623,535 $ 86,283 $ 171,476 $ (149,218 ) $ 75,687 $ 2,313,437 2017 Net balances at year start Additions Disposals Transfers and others Depreciation /loss from revaluation Net balances at year end Estimated useful lives (years) Vessels $ 8,028,276 $ 99 $ 2,113 $ (6,424,674 ) (a) $ 483,338 (b) $ 1,118,250 25 Shipyard 363 - - - 45 318 40 Major vessel maintenance 4,457 62,172 - (1,266 ) 52,755 12,608 2.5 Buildings and facilities 253,396 - - - 11,192 242,204 20 Warehousing equipment 1,242 - - - 595 647 10 Computer equipment 794 272 - - 510 556 3 and 4 Terminal equipment 3,319 425 - 4,118 977 6,885 10 Ground transportation equipment 4,203 508 - 1,247 2,207 3,751 4.5 and 10 Other equipment 9,556 226 - (67 ) 2,074 7,641 8,305,606 63,702 2,113 (6,420,642 ) 553,693 1,392,860 Land 1,060,661 - 41 148,807 25,000 1,184,427 Construction in progress 198,605 16,520 13,127 (155,750 ) - 46,248 $ 9,564,872 $ 80,222 $ 15,281 $ (6,427,585 ) $ 578,693 $ 2,623,535 All the amounts for depreciation and for loss from revaluation are included as part of the depreciation, amortization and loss from revaluation on the consolidated statements of profit or loss. The accumulated depreciation on property, vessels and equipment at December 31, 2018 and 2017 is $365,264 and $313,926, respectively. The decrease is basically due to the recognition of the fair value of the vessels; therefore, its accumulated depreciation was cancelled. (a) In 2018 is comprised primarily for revaluation surplus by $161,411. In 2017 is comprised primarily for revaluation surplus by $941,957 net of reduction for deconsolidation of TMM DM in a total of $7,445,415. (b) In 2017 includes $56,213 loss from revaluation of two vessels . (c) On May 7, 2018, was formalized the sale of the chemical tanker Maya to Yangzijiang Express Shipping PTE. LTD, by TMM Parcel Tankers, S.A. de C.V., subsidiary of Grupo TMM. (d) The sale agreement of the land located in Santiago Tlaltepoxco in the Municipality of Huehuetoca, State of Mexico, between Comercializadora Columbia, S.A. de C.V. and Inmobiliaria TMM, S.A. de C.V., a subsidiary of Grupo TMM , (e) At 2018 year end, the supply vessel ‘Subsea 88’ suffered a major mishap in one of its areas and for which it stopped operating. As at December 31, 2018, Grupo TMM was making the corresponding insurance claims without a final settlement having been issued on the mishap as of that date. Since the repair of the ship requires a substantial time that affects future cash flows, Management recognized a loss in fair value in the amount of $206,076 . If the cost model had been used, the revalued carrying amounts for vessels, land and properties at December 31, 2018 and 2017, would be as follows: 2018 2017 Vessels $ 400,098 $ 452,100 Lands 715,616 715,616 Properties 152,249 156,888 $ 1,267,963 $ 1,324,604 The revalued amounts include a revaluation surplus of $899,863 and $1,220,277 in 2018 and 2017, respectively, before taxes, which is not available for distribution to stockholders. Fair value measurement See Note 25 regarding the measuring of fair value for vessels and properties. Guarantees At December 31, 2018 and 2017 , and ‘B.V. Scheepswerf Damen Gorinchem’, as well as the financial lease with ‘FTAI Subsea 88’

Concession rights

Concession rights	12 Months Ended
	Dec. 31, 2018
Concession rights [Abstract]
Concession rights	10 Concession rights The Company holds concessions to operate the cruise and vehicle terminal at the port of Acapulco, Guerrero and the tugboat services at the port of Manzanillo, Colima. Under these concession agreements, the Company is obliged to keep the facilities included in the concession in good condition. At the end of the concessions, these facilities will revert to the federal government. Therefore, the concession rights and the partial rights assignments provide for rights in favor of the federal government (see Note 28). At December 31, 2018 and 2017, the Company was in compliance with its obligation to maintain the concessioned facilities in good condition. The concession rights at December 31, 2018 and 2017 are summarized as follows: 2018 2017 Years to amortize Administración Portuaria Integral de Acapulco (a) $ 94,607 $ 94,607 10 Transportación Marítima Mexicana (b) 30,266 30,266 - 124,873 124,873 Accumulated amortization (115,414 ) (111,629 ) Concession rights, net $ 9,459 $ 13,244 The amortization of the concession rights was $3,785 for the years ended December 31, 2018 and 2017. (a) Concession expires June 2021. (b) Renewal expires January 16, 2023, with the possibility of renewing for another 8 years. In January 2007, the total value of this concession was amortized prior to the renewal.

Other non-current assets

Other non-current assets	12 Months Ended
	Dec. 31, 2018
Other non-current assets [Abstract]
Other non-current assets	11 Other non-current assets Other non-current assets at December 2018 and 2017 are as follows: 2018 2017 Prepaid expenses $ 42,406 $ 29,535 Security deposits 18,344 7,076 Other equity investments 5,988 5,989 Services & Solutions Optimus, S.A. de C.V. (b) (1,217 ) (1,217 ) Almacenes de Jugos Cítricos de México, S.A.P.I. de C.V. (a) - - TMM División Marítima, S.A. de C.V. (c) - - $ 65,521 $ 41,383 (a) In July 2014, Grupo TMM contributed $40,000 to the capital stock of Almacenes de Jugos Citricos de Mexico, S.A.P.I. de C.V., which represents 21% of the voting shares. Since this entity has not started up operations as at the issue date of the consolidated financial statements, Company Management decided reserve the investment in its entirety. (b) On February 24, 2016, Grupo TMM entered into a ‘Project Development Contract’, through its subsidiary Services & Solutions Optimus, S. de R.L. de C. V. (Optimus) with TransCanada and Sierra Oil & Gas, through its subsidiary Caoba Energia, S. de R.L. de C.V. (an unrelated third party, henceforth ‘Caoba’), whereby a petroleum liquid terminal (‘Tuxpan Project’) will be developed. In accordance with the Project Development Contract, on February 29, 2016, Caoba contributed the capital stock of Optimus in the amount of $4,563, thereby diluting the equity of Grupo TMM to 50%, and granting joint control to the parties to this agreement. The foregoing is classified as a joint venture. In addition, Grupo TMM and Caoba would contribute $6.16 million dollars each one for a total contribution amounting to $12.333 million dollars in the capital stock of Optimus, which should be paid within a period of 3 years as of May 26, 2016. Caoba would make the payment on capital stock through a payment in kind of costs and expenses related to the Tuxpan Project, and Grupo TMM will capitalize that Optimus has in benefit of the Company, derived from the sale of the land (see Notes 19). As discussed in Note 29, on February 14, 2019, the Company acquired the remaining 50% of this joint venture (Optimus) from TransCanada and Sierra Oil & Gas. Consequently, effective on such date, Optimus will be a 100% subsidiary of Grupo TMM. The purpose of this acquisition is to continue to develop hydrocarbon and refined oil product storage and transportation infrastructure, such as gasoline, diesel, and turbosine in the Port of Tuxpan, to meet the growing demand thereof. (c) As discussed in Note 4, the Company lost control of its subsidiary TMM DM in 2017, retaining 15% equity in its capital and exercising significant influence. Accordingly, this investment has been classified as an investment in associate. As at December 31, 2018 and 2017, the value of this investment is nil, since the stockholders’ equity of TMM DM is negative. Moreover, in accordance with the statutes of TMM DM, the stockholders only assume obligation in connection with their equity up to the amount thereof.

Intangible assets

Intangible assets	12 Months Ended
	Dec. 31, 2018
Intangible assets [Abstract]
Intangible assets	12 Intangible assets Intangible assets at December 31, 2018 and 2017 are summarized as follows: 2018 Net balances at year start Additions (Disposals) Transfers and others Amortization Net balances at year end Estimated useful life (years) Software $ 2,362 $ - $ - $ 1,453 $ 909 3 and 5 Trademark (a) 125,528 - - - 125,528 Indefinite $ 127,890 $ - $ - $ 1,453 $ 126,437 2017 Net balances at year start Additions (Disposals) Transfers and others Amortization Net balances at year end Estimated useful life (years) Software $ 8,114 $ - $ (4,079 ) $ 1,673 $ 2,362 3 and 5 Trademark (a) 125,528 - - - 125,528 Indefinite $ 133,642 $ - $ (4,079 ) $ 1,673 $ 127,890 (a) Corresponds to the rights on the Marmex trademark associated with the specialized maritime division segment, specifically the offshore vessels operation. This trademark is subject to annual impairment testing. The accumulated amortization of intangible assets at December 31, 2018 and 2017 is $4,236 and $10,822, respectively.

Impairment of long-lived assets

Impairment of long-lived assets	12 Months Ended
	Dec. 31, 2018
Impairment of long-lived assets [Abstract]
Impairment of long-lived assets	13 Impairment of long-lived assets At December 31, 2018 and 2017, Grupo TMM had performed annual impairment tests. The recoverable amounts of the cash generating units were determined based on calculations of the value in use and fair value less costs of sale as follows: Vessels and trademark Vessels are identifiable assets that individually generate cash flows which are largely independent from the flows from other assets or groups of assets. The trademark is considered an asset that does not generate flows independently, therefore this was grouped with the vessels as a cash-generating unit (specialized maritime division segment) together with other long-lived assets in this segment. The recovery value for these assets was determined as the higher between their value in use and their market value, less selling costs. At December 31, 2018 and 2017, no impairment losses were determined for these assets. Properties The recoverable value of properties was determined as their fair value less costs of sale, which are considered immaterial in terms of the fair value. The determination of fair value is described in Note 25. At December 31, 2018 and 2017 no impairment losses were determined for these assets. Corporate assets and other long-lived assets These assets are not identified with any cash-generating unit, therefore these were evaluated at the Grupo TMM level. The recoverable amount of these assets was determined as their value in use. At December 31, 2018 and 2017, no impairment losses were determined for these assets. The recoverable amounts for cash-generating units were determined based on calculations of the value in use, covering a detailed three-year projection, followed by an extrapolation of the cash flows expected for the useful lives remaining for the assets using the growth rates determined by Management. The present value of the cash flows expected for each segment was determined applying an appropriate discount rate. 2018 2017 Growth rate Discount rate Growth rate Discount rate Vessels 2.00 % 7.18 % 2.00 % 7.18 % Growth rates The growth rates reflect the long-term average for these rates for the specialized maritime segment (all publicly available). Discount rates The discount rate reflects adequate adjustments associated with the market risk and the specific risk factors. Cash flow assumptions The key assumptions of Management for the specialized maritime segment include stable profit margins, which have been determined based on experience in this market. Grupo TMM Management considers this to be the best information available to forecast this market. The cash flow projections reflect stable profit margins achieved before the period covered by said projections. No consideration has been given to efficiency improvements and prices and salaries reflect the inflation projected for the industry, which are publicly available. In addition to the considerations described above for determining the value in use of assets and the cash-generating units described above, Management is currently not aware of any other probable change that could require changes in their estimate. However, the estimate for the recoverable amount for the specialized maritime segment is particularly sensitive to the discount rates. If the discount rate used increases 1%, the value in use would decrease up to 6 .

Financial assets and liabilitie

Financial assets and liabilities	12 Months Ended
	Dec. 31, 2018
Financial assets and liabilities [Abstract]
Financial assets and liabilities	14 Financial assets and liabilities Categories of financial assets and liabilities The financial assets and liabilities at December 31, 2018 and 2017 are summarized as follows: 2018 2017 Financial assets Valued at amortized cost Cash and cash equivalents $ 278,842 $ 422,083 Restricted cash 39,313 39,471 Trade receivables 179,233 182,623 Other accounts receivable 226,508 143,925 Related parties 207,964 217,188 Total current financial assets $ 931,860 $ 1,005,290 Financial liabilities Valued at amortized cost Short-term portion of the financial debt $ 223,362 $ 502,361 Trade payables 262,090 169,072 Accounts payable and accrued expenses 346,505 339,426 Related parties 18,379 34,756 Total short-term portion of the financial debt 850,336 1,045,615 Long-term financial debt 392,063 396,257 Total financial liabilities $ 1,242,399 $ 1,441,872 At December 31, 2018 and 2017, the carrying value of the financial assets and liabilities at amortized cost is considered similar to their fair value. The information for financing at December 31, 2018 and 2017 is summarized as follows: 2018 2017 Short-term Long-term Short-term Long-term Payable in Mexican pesos Daimler Financial Services México, S. de R.L. de C.V $ 8,191 $ 18,579 $ 17,218 $ 21,246 Recognition of debt and substitution of debtor for $40.9 million at a fixed rate of 12%, with monthly payments of principal and interest and maturing November 2019. In order to improve the profile of the schedule of payments, a new debt recognition was formalized on October 11, 2018, in the amount of $28 million at a 12.9% fixed rate, with monthly payments on principal and interest, due October 2021. Banco Autofin México, S.A. Institución de Banca Múltiple 23,342 52,036 19,559 55,930 Five lines of credit with mortgage surety for $45.8, $34.6, $25.5, $21.6, and $8.4 million at a variable rate of the 28- day TIIE plus 450 basis points, with monthly payments of principal and interest, maturing September 2021. On November 26, 2018, a new line of credit was drawn down in the amount of $20 million at a variable rate at 28-day TIIE, plus 550 base points, due November 2023. INPIASA, S.A. de C.V. 1,566 2,610 1,566 4,175 Contract for line of credit, the first for $15.7 million at a variable rate of the 28-day TIIE plus 450 basis points, with monthly payments of principal and interest, and maturing August 2021. Banco del Bajío, S.A. 1,304 - 1,423 1,304 $8.5 million line of credit at a variable rate of the 28-day TIIE plus 250 points, with monthly payments of principal and interest, and maturing November 2019. HSBC, S.A. 1,629 2,173 1,629 3,802 $9.77 million line of credit at a variable rate of the 28-day TIIE plus 300 points, with monthly payments of principal and interest, and maturing April 2021. Banco del Bajío, S.A. Intemza 1,264 842 1,264 2,106 $9.36 million line of credit at a variable rate of the 28-day TIIE plus 250 points, with monthly payments of principal and interest, and maturing August 2020. 2018 2017 Short-term Long-term Short-term Long-term CI Banco S.A. Institución de Banca Múltiple - - 15,000 - $40 million line of credit at a variable rate of the 28-day TIIE plus 150 points, with monthly payments of principal and interest on outstanding balances, and maturing November 2018. Interest payable 6,801 - 2,213 - 44,097 76,240 59,872 88,563 Payable in US dollars DVB Bank América, NV - - 282,677 - Two lines of credit with mortgage surety; the first for US$25.0 million (approximately $485.2 million) at an average rate of 7.42% and maturing May 2017. The second, for US$27.5 million, at an average rate of 7.78%, and maturing June 2017. The restructuring of the payment schedule and outstanding balance amounting to $16 million dollars was formalized in June 2017, with a variable Libor rate at 90 days plus 325 points, with monthly payments on principal and interest on unpaid balances, due June 2018. On May 17, 2018, the total line was prepaid in the original amount of $25 million dollars. The Company was awarded an extension of the due date of the second line, which originally amounted to $27.5 million dollars. It was entirely liquidated on September 19, 2018. ACT Maritime, LLC (c) 15,330 81,452 - - A line of credit at 5 years was contracted in September 2018 in the amount of $5.52 million dollars with a variable Libor rate at 90 days plus 750 points, with quarterly payments of principal and interest, due September 2023. The total credit line that it had with DVB Bank America NV was totally liquidated with the proceeds of this line DEG-Deutsche Investitions – UND 35,382 - 23,682 29,603 US$8.5 million line of credit with pledge surety at 8.01% fixed rate, with semiannual payments of principal and interest on outstanding balances, with a two-year grace period on the principal and maturing July 2014. On September 2, 2016, the restructuring of the outstanding balance amounting to $4.1 million dollars (approximately 80.9 million) by extending the due date up to December 2019, with quarterly payments on principal and interest on the unpaid balance at a variable Libor rate at 90 days plus 550 points for the first 4 quarters, 650 points for the next 4 quarters, 750 points for the net 4 quarters, and finally 900 points for the last 2 quarters. In order to have a better payment profile, the Company is negotiating with the bank to extend the credit term. 2018 2017 Short-term Long-term Short-term Long-term Other (e) 88,455 - 98,677 - Unsecured credits were contracted, each one amounting to $3 million dollars at a fixed rate of 11.25%, with semester payments on principal and interest, originally due January 2016. Both credits were contracted again in January 2017, and $1 million dollars on one of them was paid and both were due in July 2017. The payment rescheduling and outstanding balance amounting to $5 million dollars were formalized in July 2017, with a fixed rate of 11.25% with monthly payments on interest and principal, due July 2018. A new rescheduling of payments and unpaid balance amounting to $4.5 million dollars was formalized in July 2018, with an 11.25% fixed rate with monthly interest payments. The principal amounting to $500 thousand dollars was paid in July 2018, and the balance of 4.5 million dollars is due in July 2019. FTAI Subsea 88, Ltd 14,755 157,986 10,954 171,479 US$10.8 million line of credit through financial leasing, at 15.92% fixed rate with monthly payments of principal and interest on outstanding balances and maturing November 2023. The Company has been in a negotiation process with the finance entity to improve its debt payment profile since October 2018, due to the incident of the ship financed in November 2018. (See Note 9) 153,922 239,438 415,990 201,082 2018 2017 Short-term Long-term Short-term Long-term Payable in euros B V Scheepswerf Damen Gorinchem 25,343 76,385 26,499 106,612 Opening line of credit amounting to $7.58 million euros (approximating $159.2 million), at a 7.0% fixed rate with semester payments on principal and interest on unpaid balances and due November 2022. 25,343 76,385 26,499 106,612 $ 223,362 $ 392,063 $ 502,361 $ 396,257 (a) On October 11, 2018 Company concluded a new restructuring process of the payment schedule due in October 2021. (b) They correspond to judicial and private agreements signed for the debt recognition with respect to Deposit Certificates secured and backed by Almacenadora de Depósito Moderno, S.A. de C.V. (ADEMSA), related party. (c) The total line was prepaid in the original amount of $25 million dollars on May 17, 2018. The Company was awarded an extension of the due date of the second line, which originally amounted to $27.5 million dollars up to September 19, 2018, date on which the line with DVB Bank America, NV was entirely paid. This payment was made with the proceeds of a new line of credit with ACT Maritime, LLC. (Subsidiary of Alterna Capital Partners, LLC.) in the amount of $5.52 million dollars at a 5 year term. (d) The Company formally completed the restructuring of the payment schedule and the new due date will be on December 15, 2019. The Company started negotiations with the Bank to extend the due date of the credit and improve its amortization profile. (e) On July 19, 2018, both loans were re-contracted, extending the term to July 19, 2019. On the date of authorization of issuance of these consolidated financial statements, the Company is up to date with its obligations. Covenants Some of the agreements related to the abovementioned loans contain certain covenants including the observance of certain financial ratios, restrictions on dividend payments, and sales of assets, among others. As at December 31, 2018 and 2017, Grupo TMM and subsidiaries complied with the covenants set forth in those contracts. The interest expense on the trust certificates and bank loans was $80,580 and $1,039,856 for the periods of twelve months ended December 31, 2018 and 2017, respectively . The maturity of the long-term financial debt at December 31, 2018 and 2017 is as follows: Maturity 2018 2017 2019 $ - $ 115,683 2020 99,363 65,390 2021 95,243 61,711 2022 72,985 48,538 2023 124,472 104,935 $ 392,063 $ 396,257 (a) There is no financing due subsequent to 2023.

Balances and transactions with

Balances and transactions with related parties	12 Months Ended
	Dec. 31, 2018
Balances and transactions with related parties [Abstract]
Balances and transactions with related parties	15 Balances and transactions with related parties The accounts payable and transactions with related parties at December 31, 2018 and 2017 are summarized as follows: 2018 2017 Receivable Payable Receivable Payable Optimus (see Note 11) $ 59,098 $ - $ 59,098 $ - SSA México, S.A. de C.V. (a) - 18,379 - 34,756 TMM DM (b) 148,866 - 158,090 - $ 207,964 $ 18,379 $ 217,188 $ 34,756 (a) SSA México, S.A. de C.V., is a company with which Grupo TMM and Administración Portuaria Integral de Acapulco, S.A. de C.V. conduct leasing operations and consulting. (b) The balances with TMM DM arise due to the loss of control of the latter and are related to the maritime operations of TMM DM with the Group. The most relevant transactions with related parties at December 31, 2018, 2017 and 2016 are summarized as follows: 2018 2017 2016 Income: Gain on sale of fixed assets (see Note 9) $ - $ - $ 54,679 Maritime services provider (c) 187,426 - - Leases (a) 66 788 788 $ 187,492 $ 788 $ 55,467 Expenses: Other expenses (b) $ 366 $ 415 $ 346 (a) Grupo TMM, S.A.B. lease operations with SSA México, S.A. de C.V. (b) Management consulting provided by SSA México, S.A. de C.V. to Administración Portuaria Integral de Acapulco, S.A. de C.V. (c) Maritime services provider between TMM Direccion Corporativa, S.A. de C.V, subsidiary of Grupo TMM and TMM DM, related party. Transactions involving executive personnel for the years ended December 31, 2018, 2017 and 2016 include the following expenses: 2018 2017 2016 Short-term benefits Salaries 33,790 $ 31,065 $ 37,768 Social security costs 462 471 623 $ 34,252 $ 31,536 $ 38,391

Accounts payable and accrued ex

Accounts payable and accrued expenses	12 Months Ended
	Dec. 31, 2018
Accounts payable and accrued expenses [Abstract]
Accounts payable and accrued expenses	16 Accounts payable and accrued expenses Accounts payable and accrued expenses at December 31, 2018 and 2017 are shown as follows: 2018 2017 General expenses $ 149,621 $ 143,409 Purchased services 92,176 91,122 Operating expenses 45,187 42,035 Taxes payable 11,018 1,492 Salaries and wages 1,404 1,678 Other 58,117 62,182 $ 357,523 $ 341,918

Stockholders' equity

Stockholders' equity	12 Months Ended
	Dec. 31, 2018
Stockholders' equity [Abstract]
Stockholders' equity	17 Stockholders’ equity Capital stock At December 31, 2018 and 2017, the Company’s capital stock is comprised of 102,182,841 shares outstanding, registered, without par value, and with voting rights, which may be held by Mexican nationals, investors, or companies that include in their bylaws the exclusion of foreigners clause. Foreigners may acquire shares under the figure of American Depository Shares (‘ADSs’). The TMM ADSs are traded ‘Over-The-Counter’ (‘OTC’) under the listing code GTMAY. The underlying TMM common shares for the ADSs continue to be traded on the Mexican Stock Exchange under the listing code TMM A. Net tax profit account (CUFIN) As at December 31, 2018 and 2017, the restated balance of the Net Taxable Income Account (CUFIN for its acronym in Spanish Dividends or earnings distributed to stockholders that are paid out of the CUFIN balance generated up to December 31, 2014 will not be subject to income tax until that balance is exhausted. Moreover, those balances paid out of the CUFIN generated beginning fiscal 2014 paid to individuals or foreign residents are subject to a 10% tax, which is final. Dividends not drawn from the CUFIN, in addition to the above, will continue to be subject to income tax, paid by the entity, based on the general rate set by law, which is definitive and may be credited against the income tax for this and the next two years. The balance in these accounts is susceptible to adjustment to the distribution date using the Mexican Consumers’ Price Index (INPC). Capital decreases At December 31, 2018 and 2017, the current balance in the Capital Contribution Account (CUCA for its acronym in Spanish In the event the equity capital exceeds the balance in the CUCA, the difference will be considered a dividend or distributed earning subject to the payment of income tax. If the earnings in reference come from the CUFIN, there will be no corporate tax due for the capital decrease or reimbursement. Otherwise, these will be treated as dividends or distributed earnings. Other components of equity Details of other components of equity at December 31, 2018 and 2017 are shown following: Statutory reserve Defined benefit plan Premium on convertible obligations Translation result Revaluation surplus Total Balance at December 31, 2016 $ 216,948 $ (1 36,441 ) $ 77,106 $ (247,668 ) $ 2,353,163 $ 2,263,108 Revaluation of vessels and properties - - - - 941,957 941,957 Defined benefit plan - 319 - - - 319 Reclassification from disposal of properties and depreciation - - - - (2,073,235 ) (a) (2,073,235 ) Total before taxes - 319 - - (1,131,278 ) (1,130,959 ) Tax expense - (96 ) - - (282,587 ) (282,683 ) Total net of taxes - 223 - - (1,413,865 ) (1,413,642 ) Balance at December 31, 2017 $ 216,948 $ (136,218 ) $ 77,106 $ (247,668 ) $ 939,298 $ 849,466 Revaluation of vessels - - - - (161,411 ) (161,411 ) Defined benefit plan - 15,430 - - - 15,430 Reclassification from disposal of properties and depreciation (40,335 ) (40,335 ) Total before taxes - 15,430 - - (201,746 ) (186,316 ) Tax expense - (4,629 ) - - 48,423 43,794 Total net of taxes - 10,801 - - (153,323 ) (142,522 ) Balance at December 31, 2018 $ 216,948 $ (125,417 ) $ 77,106 $ (247,668 ) $ 785,975 $ 706,944 (a) It corresponds to the reclassification of the revaluation surplus to accumulated losses from the sale of properties and to the depreciation of the period of revaluation of properties and vessels.

Revenues

Revenues	12 Months Ended
	Dec. 31, 2018
Revenues [Abstract]
Revenues	18 Revenues The revenues at December 31, 2018, 2017 and 2016 are summarized as follows: 2018 2017 2016 Maritime Parcel tankers $ 312,305 $ 298,631 $ 327,202 Maritime administration services 187,426 - - Bulk Carrier 144,664 40,693 - Shypyard 138,517 65,429 68,745 Offshore vessels 56,506 826,264 978,282 Tugboats 70,037 270,225 322,136 Tankers - 450,078 471,220 Ports and terminals Port services 101,688 67,937 64,230 Shipping agencies 64,283 66,259 52,478 Logistics, warehousing and other businesses Repair of containers 234,534 183,966 149,098 Warehousing 160,991 149,894 126,070 Intermodal terminal 47,581 40,677 38,585 Automotive services 4,534 4,886 3,219 Others business - - 46,219 Total consolidated revenue $ 1,523,066 $ 2,464,939 $ 2,647,484 The Company’s revenues do not show any particular grouping characteristic, such as by type of customer (government and private), geographic zone, etc. The main grouping is shown based on the type of revenue for each segment. Moreover, as discussed in Note 3.17, all of the Company’s revenues are recognized over time.

Other income

Other income	12 Months Ended
	Dec. 31, 2018
Other income [Abstract]
Other income	19 Other income Other income (expenses) at December 31, 2018, 2017 and 2016 is summarized as follows: 2018 2017 2016 Gain (loss) from the sale of subsidiaries (a) $ 111,484 $ (273,032 ) $ - Recoveries of taxes paid in prior years, net of expenses for recovery (3,919 ) 43,884 - Cancellation of projects (5,604 ) (13,127 ) (6,240 ) Other, net 664 1,554 2,576 Gain from loss of control of subsidiary TMMDM (see Note 4) - 3,458,467 - Income from sale of fixed assets (b) (Note 11) - - 56,534 $ 102,625 $ 3,217,746 $ 52,870 (a) In 2018 and 2017, corresponds to the income from the sale of subsidiaries (see Note 4). (b) It includes the sale of a land to Optimus on June 20, 2016 (see Note 11).

Interest expense and other fina

Interest expense and other financial costs	12 Months Ended
	Dec. 31, 2018
Interest expense and other financial costs [Abstract]
Interest expense and other financial costs	20 Interest expense and other financial costs This line at December 31, 2018, 2017 and 2016 is comprised as follows: 2018 2017 2016 Interest on other loans $ 80,580 $ 97,590 $ 98,630 Amortization of transaction cost associated with other loans 2,164 4,137 6,011 Other financial expenses 2,146 3,802 3,645 Interest on trust certificates - 942,266 684,829 Transaction cost of mandatorily convertible debentures into shares - 87,482 - Amortization of trust certificate transaction cost - 75,209 76,152 $ 84,890 $ 1,210,486 $ 869,267

Income tax and tax loss carryfo

Income tax and tax loss carryforwards	12 Months Ended
	Dec. 31, 2018
Income tax and tax loss carryforwards [Abstract]
Income tax and tax loss carryforwards	21 Income tax and tax loss carryforwards Income Tax Results for the year Grupo TMM and Subsidiaries incurred combined tax profits (losses) for the years ended December 2018 and 2017, in the amounts of $157,448 and $(432,139) , The difference between taxable and book income is due primarily to the net effect of the gain or loss on inflation recognized for tax purposes, the difference between tax and book amortization and depreciation, non-deductible expenses, gain from loss of control of subsidiary, as well as certain temporary differences reported in different periods for financial and tax purposes. In accordance with the currently enacted Income Tax Law, the rate for 2016, 2017, 2018, and subsequent years is 30%. The provision for income tax recognized in the statement of profit or loss for the years ended December 31, 2018, 2017 and 2016 is shown following: 2018 2017 2016 Income tax $ (4,799 ) $ (3,000 ) $ (3,433 ) Deferred income tax - (513,732 ) 272,048 Total income tax (expense) benefit $ (4,799 ) $ (516,732 ) $ 268,615 The reconciliation between the provision for income tax based on the statutory income tax rate and the provision recorded by the Company at December 31, 2018, 2017 and 2016 is as follows: 2018 2017 2016 Profit (loss) before taxes $ 28,348 $ 1,846,311 $ (775,179 ) Income tax (8,504 ) (553,893 ) 232,554 (Decrease) increase from: Difference in depreciation and amortization (56,356 ) 503,479 48,701 Revaluation surplus (48,424 ) 265,723 132,019 Income recognized in advance (62 ) (1,678 ) (8,261 ) Materials and supplies (19,888 ) 5,503 (15,673 ) Inflationary and currency exchange effects on monetary assets and liabilities, net (26,686 ) (203,983 ) (102,928 ) Tax losses – net 206,485 (1,255,433 ) 116,906 Provisions and allowance for doubtful accounts (44,609 ) (183,963 ) (63,803 ) Difference between the tax and book value for the sale of assets (15,551 ) (435 ) (60,277 ) Difference between the tax and book value for the sale of shares 20,800 956,613 20,136 Non-deductible expenses (12,004 ) (48,665 ) (30,759 ) Provision for income tax $ (4,799 ) $ (516,732 ) $ 268,615 The components of deferred tax liability at December 31, 2018 and 2017 are comprised as follows: 2018 2017 Concession rights and property, vessels and equipment $ (580,703 ) (619,651 ) Portion of tax loss carryforwards for subsequent years 308,380 $ 279,334 Inventories and provisions – net 45,520 65,091 Total deferred tax liability $ (226,803 ) $ (275,226 ) Tax loss carryforwards At December 31, 2018, Grupo TMM and its subsidiaries, report the following cumulative tax losses, which are restated applying the INPC factors according to Mexican law. Year in which the loss was incurrred Amounts Year of expiration 2009 $ 87,963 2019 2010 149,754 2020 2011 86,080 2021 2012 184,313 2022 2013 227,106 2023 2014 148,867 2024 2015 64,961 2025 2016 362,084 2026 2017 72,102 2027 2018 183,172 2028 $ 1,566,402

Segment reporting

Segment reporting	12 Months Ended
	Dec. 31, 2018
Segment reporting [Abstract]
Segment reporting	22 Segment reporting The Company operates in the following segments: i) specialized maritime transportation, ii) logistics, and iii) ports and terminals, iv) warehousing. Specialized maritime transportation operations (‘Specialized Maritime Division’) include transportation of bulk liquid products, materials, and provisions for drilling platforms, as well as towing services for ships. Logistics solution service operations (‘Logistics Division’). Operations at ports and terminals (‘Port and Terminal Division’) include loading and unloading, storage at maritime port terminals, and shipping agency operations. Storage operations (‘Storage Division’) include storage and management of the facilities and bonded warehouses. There are no changes in the measuring methods used to calculate the earnings reported for each segment. The information for each operating segment is as follow: December 31, 2018 Specialized maritime division Logistics division Ports and terminal division Warehousing division Other businesses and shared accounts Total consolidated Revenue $ 909,455 $ 286,649 $ 165,971 $ 160,991 $ - $ 1,523,066 Costs and expenses (727,535 ) (248,364 ) (106,993 ) (165,388 ) (473 ) (1,248,753 ) Corporate expenses - - - - (198,404 ) (198,404 ) Depreciation and amortization (59,451 ) (2,772 ) ( 9,616 ) (1,305 ) (7,133 ) (80,277 ) Trasnportation profit (loss) $ 122,469 $ 35,513 $ 49,362 $ ( 5,702 ) $ (206,010 ) $ (4,368 ) Costs, expenses and revenue not allocated 27,917 Net profit for the year $ 23,549 Total assets by operating segment $ 2,641,105 $ 55,586 $ 1,766,631 $ 238,740 $ - $ 4,702,062 Shared assets - - - - (920,978 ) (920,978 ) Total assets $ 2,641,105 $ 55,586 $ 1,766,631 $ 238,740 $ ( 920,978 ) $ 3,781,084 Total liabilities by operating segment $ 887,042 $ 19,055 $ 255,460 $ 66,515 $ - $ 1,228,072 Shared liabilities - - - - 428,754 428,754 Total liabilities $ 887,042 $ 19,055 $ 255,460 $ 66,515 $ 428,754 $ 1,656,826 Total capital expenditures by segment $ 42,745 $ 592 $ 13,176 $ 582 $ - $ 57,095 Shared capital expenditures - - - - 29,188 29,188 Total capital expenditures $ 42,745 $ 592 $ 13,176 $ 582 $ 29,188 $ 86,283 December 31, 2017 Specialized maritime division Logistics division Ports and terminal division Warehousing division Other and shared accounts Total consolidated Revenue $ 1,951,320 $ 229,529 $ 134,196 $ 149,894 $ - $ 2,464,939 Costs and expenses (1,386,282 ) (193,826 ) (112,771 ) (180,356 ) (1,123 ) (1,874,358 ) Corporate expenses - - - - (205,622 ) (205,622 ) Depreciation and amortization (541,030 ) (1,660 ) (11,143 ) (1,205 ) (7,877 ) (562,915 ) Trasnportation profit (loss) $ 24,008 $ 34,043 $ 10,282 (31,667 ) $ (214,622 ) $ (177,956 ) Costs, expenses and revenue not allocated 1,507,535 Net profit for the year $ 1,329,579 Total assets by operating segment $ 5,617,173 $ 38,833 $ 1,904,928 $ 153,196 $ - $ 7,714,130 Shared assets - (3,589,918 ) (3,589,918 ) Total assets $ 5,617,173 $ 38,833 $ 1,904,928 $ 153,196 $ (3,589,918 ) $ 4,124,212 Total liabilities by operating segment $ 849,416 $ 19,425 $ 256,121 $ 56,296 $ - $ 1,181,258 Shared liabilities - - - - 713,892 713,892 Total liabilities $ 849,416 $ 19,425 $ 256,121 $ 56,296 $ 713,892 $ 1,895,150 Total capital expenditures by segment $ 64,054 $ - $ 9,034 $ 42 $ - $ 73,130 Shared capital expenditures - - - - 7,092 7,092 Total capital expenditures $ 64,054 $ - $ 9.034 $ 42 $ 7,092 $ 80,222 December 31, 2016 Specialized maritime division Logistics division Ports and terminal division Warehousing division Other businesses and shared accounts Total Consolidated Revenue $ 2,167,585 $ 190,902 $ 116,708 $ 126,070 $ 46,219 $ 2,647,484 Costs and expenses (1,385,458 ) (158,403 ) (100,109 ) (169,737 ) (46,460 ) (1,860,167 ) Corporate expenses - - - - (194,215 ) (194,215 ) Depreciation and amortization (534,525 ) (1,908 ) (10,489 ) (947 ) (7,375 ) (555,244 ) Transportation profit (loss) $ 247,602 $ 30,591 $ 6,110 $ (44,614 ) $ (201,831 ) $ 37,858 Costs, expenses and revenue not allocated (544,422 ) Net loss for the year $ (506,564 ) Total assets by operating segment $ 12,830,358 $ 25,929 $ 1,739,936 $ 148,828 $ - $ 14,745,051 Shared assets - - - - (2,821,750 ) (2,821,750 ) Total assets $ 12,830,358 $ 25,929 $ 1,739,936 $ 148,828 $ (2,821,750 ) $ 11,923,301 Total liabilities by operating segment $ 11,107,505 $ 23,874 $ 276,772 $ 47,681 $ - $ 11,455,832 Shared liabilities - - - - (496,521 ) (496,521 ) Total liabilities $ 11,107,505 $ 23,874 $ 276,772 $ 47,681 $ (496,521 ) $ 10,959,311 Total capital expenditures by segment $ 160,691 $ - $ 1,087 $ 139 $ - $ 161,917 Shared capital expenditures - - - - 155 155 Total capital expenditures $ 160,691 $ - $ 1,087 $ 139 $ 155 $ 162,072

Employee benefits

Employee benefits	12 Months Ended
	Dec. 31, 2018
Employee benefits [Abstract]
Employee benefits	23 Employee benefits Expense for employee benefits The expenses recognized for employee benefits are: 2018 2017 2016 Salaries, benefits and inherent $ 347,403 $ 550,491 $ 654,677 Pensions – defined benefit plans 21,211 21,284 (14,764 ) $ 368,614 $ 571,775 $ 639,913 The liabilities recognized for pensions and other employee remunerations in the consolidated statement of financial position are comprised as follows: 2018 2017 Long-term: Pensions and seniority premium $ 151,002 $ 150,873 Termination of employment 25,604 24,687 $ 176,606 $ 175,560 The liabilities for employee benefits, short term, are included in the line ‘Accounts payable and accrued liabilities’ in the consolidated statements of financial position, which at December 31, 2018 and 2017 are $1,404 and $1,678, respectively. Remunerations on the termination of employment The seniority premiums and the retirement plan (‘pensions’) obligations are based on actuarial calculations using the projected unit credit method. Pension benefits are based mainly on years of service, age, and salary level upon retirement. The amounts charged to operations include the amortization of the cost of past services over the average time of service remaining. The Company continues with its policy of recognizing actuarial losses and gains for seniority premiums and pensions in the consolidated statement of operations, the actuarial (loss) gain net of taxes for 2018 and 2017 was $10,801 and $223, respectively. The plan exposes Grupo TMM to such risks as interest rate, investment, mortality, and inflation. Interest rate risk The present value of the defined benefits obligation is calculated using a discount rate making reference to the market performance of high - The estimated term for the bonds is consistent with the estimated term for the defined benefits obligation and is denominated in pesos. A decrease in the market performance of high - Investment risk The plan assets are predominantly capital and debt instruments traded on the Mexican Stock Exchange which are considered low risk. Mortality risk Grupo TMM provides benefits for life to those who are covered by the defined benefits liability. An increase in the life expectancy of such persons will increase the defined benefits liability. Inflation risk A significant proportion of the defined benefits obligation is linked to inflation. An increase in the inflation rate will increase the Company’s obligation. The details of the net cost for the period for seniority premiums and termination of employment, and also the basic actuarial estimates for the calculation of these labor obligations is shown as follows: 2018 2017 Pensions and seniority premiums Termination of employment Pensions and seniority premiums Termination of employment Current service cost $ 4,114 $ 1,858 $ 5,460 $ 1,868 Interest cost 12,994 2,245 12,015 1,941 Net cost for the period $ 17,108 $ 4,103 $ 17,475 $ 3,809 At December 31, 2018 and 2017, the reserve for pensions and seniority premiums, and also for the termination of employment, is comprised as follows: 2018 2017 Pensions and seniority premiums Termination of employment Pensions and seniority premiums Termination of employment Defined benefit obligations $ 154,128 $ 25,604 $ 153,572 $ 24,687 Plan assets (3,126 ) - (2,699 ) - Total reserve $ 151,002 $ 25,604 $ 150,873 $ 24,687 At December 31, 2018 and 2017, the defined benefit obligations (DBO) for pensions and seniority premiums, and also for the reserve for termination of employment, are comprised as follows: 2018 2017 Pensions and seniority premiums Termination of employment Pensions and seniority premiums Termination of employment DBO at period start $ 153,572 $ 24,687 $ 144,049 $ 21,809 Current service cost 4,114 1,858 5,460 1,868 Interest cost 12,994 2,245 12,015 1,941 Benefits paid (165 ) (214 ) (296 ) - Benefits paid from plan assets (8,840 ) - (9,272 ) - Miscellaneous 300 (18 ) 908 - Actuarial losses and gains (7,847 ) (2,954 ) 708 (931 ) DBO at period end $ 154,128 $ 25,604 $ 153,572 $ 24,687 The plan assets at December 31, 2018 and 2017 are comprised as follows: 2018 2017 Value of the fund at year start $ 2,699 $ 1,651 Expected return on assets 202 908 Plan contributions 8,840 9,272 Benefits paid (8,840 ) (9,272 ) Interests of plan assets 225 140 Value of the fund at year end $ 3,126 $ 2,699 The changes in the pension plan, seniority premium, and termination of employment plan at December 31, 2018 and 2017 are as follows: 2018 2017 Reserve for obligations at the beginning of the period $ 175,560 $ 164,207 Cost of the period 21,211 21,284 Interest income (225 ) (140 ) Contributions to the plan (8,840 ) - Benefits paid against the reservation (379 ) (9,272 ) Miscellaneous 80 (296 ) Actuarial losses (10,801 ) (223 ) Reserve for obligations at the end of the period $ 176,606 $ 175,560 The significant actuarial assumptions used for the valuation are: 2018 2017 Discount rate 9.25 % 9.25 % Salary increase rate 4.00 % 4.00 % Inflation rate 3.50 % 3.50 % Average working life expectancy 19.30 19.80 These assumptions were prepared by Management with the assistance of independent actuaries. The discount factors are determined near the end of each year making reference to the market performance of high - At December 31, 2018 and 2017, approximately 17% of the Company’s employees work under collective bargaining agreements that are subject to annual salary reviews and biannually for other compensations. At December 31, 2018 and 2017, Grupo TMM has 1,676 and 1,494 employees, respectively. The significant actuarial assumptions to determine the defined benefits obligation are the discount rate, the salary increase rate, and the average life expectancy. The calculation of the defined benefits obligation is sensitive to these assumptions. The following table summarizes the effects of changes to these actuarial assumptions on the defined benefits obligations at December 31, 2018: 1.0% increase 1.0% decrease Discount rate (Decrease) increase in the defined benefits obligation $ (5,945 ) $ 6,325 1.0% increase 1.0% decrease Salary increase rate Increase (decrease) in the defined benefits obligation $ 4,466 $ (4,227 ) One year Increase One year Decrease Average life expectancies Increase (decrease) in the defined benefits obligation $ 5,134 $ (5,292 ) The present value of the defined benefits obligation and also the defined benefits obligation recognized in the consolidated statement of financial position are calculated using the same method (projected unit credit). The sensitivity analyses are based on a change in one assumption without changing the others. This sensitivity analysis may not be representative of the real variance in the defined benefits obligation, as it is unlikely that the change to the assumptions would occur on its own, as some of the assumptions may be correlated.

Profit (loss) per share

Profit (loss) per share	12 Months Ended
	Dec. 31, 2018
Profit (loss) per share [Abstract]
Profit (loss) per share	24 Profit (loss) per share At December 31, 2018, 2017 and 2016 number of shares outstanding during the year. There are no potentially dilutive instruments outstanding, therefore basic and diluted profit (loss) per share are the same.

Fair value measurement

Fair value measurement	12 Months Ended
	Dec. 31, 2018
Fair value measurement [Abstract]
Fair value measurement	25 Fair value measurement Fair value measures for non-financial assets The non-financial assets and liabilities measured at fair value in the statement of financial position are grouped into three levels of fair value hierarchy. The three levels are defined based on the observability of relevant data for the measuring, as follows: • Level 1: quoted prices (without adjustment) in active markets for identical assets and liabilities; • Level 2: data other than the quoted prices included in Level 1 that are observable for the asset and liability, either directly or indirectly; • Level 3: non-observable data for the asset or liability. At December 31, 2018 and 2017 non-financial assets measured at fair value are classified in Level 3 of this hierarchy, as described below: 2018 2017 Level 3 Vessels $ 782,673 $ 1,118,250 Buildings and facilities 238,901 242,204 Land 1,146,252 1,184,427 $ 2,167,826 $ 2,544,881 As of December 31, 2018 and 2017, the revalued amounts for all the vessels were determined using the revenue technique. The important information and assumptions are prepared in close collaboration with Management. The valuation processes and changes in the fair value are reviewed by the Administration and Finance Department on the financial reporting date. Additional information on fair value measurement is as follows. Vessels (Level 3) For the year ended December 31, 2017, the fair values for the offshore vessels, tugboats, and parcel tankers are estimated based on revenue that capitalizes the estimated revenue cash flows from the leasing of vessels net of operating costs projected, using an appropriate discount rate that reflects the required performance for similar assets. Cash flows are calculated based on the average of international charter rates and operating costs (including maintenance), and also the historical utilization level. The value of vessels is sensitive to changes in these variables. The most significant information, which is not observable, is the value of the estimated daily rates, the assumptions for the percentage of utilization and the discount rate. The fair value increases if the estimated daily rates and the percentage of utilization increase or if the discount rate (market yields) decreases. The appraisals in general are sensitive to these three assumptions. Management believes that the range of reasonably possible alternatives is greater for the value of the rates and the percentage of use, and also that there is a correlation between these factors. The information used for the measurement of fair value at December 31, 2018 was: Tugboats Offshore vessels Parcel Tankers Daily rate or fee 5,897 usd 4,903 usd 12,591 usd Average percentage of utilization 96 % 62 % 94 % Discount rate 7.65 % 7.18 % 7.18 % Buildings, facilities and land (Level 3) The valuation was prepared based on a market focus that reflects the prices observed on recent market transactions involving similar properties and incorporates adjustments for factors specific to the property in question, including land size, location, attachments, and current use. The most significant information used, which is not observable, is the adjustment for factors specific to the properties in question. The magnitude and direction of this adjustment depends on the characteristics of observable market transactions for similar properties used as the end point for the valuation. Although this information is subjective, Management considers that the global valuation will not be materially affected by reasonably possible alternatives. At December 31, 2018 and 2017, the reconciliation between the carrying amounts of non-financial assets classified within Level 3 is as follows: Vessels Buildings and Facilities Balance at January 1, 2018 $ 1,118,250 $ 1,426,631 Amount recognized in other comprehensive income: Revaluation surplus of vessels (161,411 ) - Amount recognized in statements of operations: Loss on revaluation of vessels - - (161,411 ) - Additions and disposals, net (174,166 ) (41,478 ) Balance at December 31, 2018 $ 782,673 $ 1,385,153 Balance at January 1, 2017 $ 8,028,276 $ 1,314,057 Amount recognized in other comprehensive income: Revaluation surplus of vessels 941,957 - Amount recognized in statements of operations: Loss on revaluation of vessels (56,213 ) - 885,744 - Additions and disposals, net (7,795,770 ) 112,574 Balance at December 31, 2017 $ 1,118,250 $ 1,426,631 At December 31, 2018 and 2017, there were no effects from unrealized gains from fair value measurements.

Financial instruments risk

Financial instruments risk	12 Months Ended
	Dec. 31, 2018
Financial instruments risk [Abstract]
Financial instruments risk	26 Financial instruments risk The Group is exposed to various risks in relation to financial instruments. The Group’s financial assets and liabilities by category are summarized in Note 14. The main types of risks are market risk, credit risk and liquidity risk. The Group’s risk management is coordinated at its headquarters, in close cooperation with the board of directors, and focuses on actively securing short to medium-term cash flows by minimizing the exposure to volatile financial markets. The Group does not actively engage in the trading of financial assets for speculative purposes nor does it write options. The most significant financial risk to which the Group is exposed are described below: Market risk Currency risk The monetary position for Grupo TMM may be materially affected by variances in the exchange rate between the US dollar and the Mexican peso due to the Company’s significant operations in Mexico. The Company does not cover this exposure. Grupo TMM minimizes its exposure effects in foreign currency by contracting financial debt in Mexican pesos. Grupo TMM also faces transactional currency exposure. This exposure derives from sales and acquisitions made in currencies other than Mexican pesos, Grupo TMM’s functional currency. At December 31, 2018 and 2017, approximately 45% and 75%, respectively of Grupo TMM’s sales are denominated in US dollars, while approximately 25% the costs and expenses for both years are denominated in US dollars. At December 31, 2018 and 2017, the Company held monetary assets and liabilities denominated in foreign currencies other than the Mexican peso, translated at the corresponding interbank exchange rate as related to the Mexican peso, as follows: 2018 2017 US $ Other currencies US $ Other currencies Assets $ 484,443 $ 1,108 $ 548,919 $ 1,120 Liabilities (637,953 ) (103,096 ) (828,367 ) (134,547 ) $ (153,510 ) $ (101,988 ) $ (279,448 ) $ (133,427 ) At December 31, 2018 and 2017, the exchange rate was Ps 19.6566 and Ps 19.7354 per US dollar, respectively. At April 29, 2018, release date of the consolidated financial statements, the net position in US dollars, unaudited, was similar to that at December 31, 2018, and the exchange rate was $ 19.0942 Sensitivity analysis The following table shows for the years ended December 31, 2018 and 2017, the sensitivity in operations associated with to the financial assets and liabilities of Grupo TMM and the exchange rate; US dollar (USD)/peso “considering that the rest of the conditions remain unchanged”. Assuming a variance of +/- 0 If the peso had strengthened or weakened against the USD by 0.04% for 2018 and 4.73% for 2017, this would have had the following impact on the monetary position: 2018 2017 0.04% Increase in the exchange rate 0.04% decrease in exchange rate 4.73% Increase in the exchange rate 4.73% decrease in the exchange rate Assets in US dollars $ 155 $ (155 ) $ 25,989 $ (25,989 ) Assets in other currencies (204 ) 204 53 (53 ) Liabilities in US dollars (33 ) 33 (39,219 ) 39,219 Liabilities in other currencies - - (6,370 ) 6,370 $ (82 ) 82 $ (19,547 ) $ 19,547 The exposure to exchange rates varies during each year, depending on the volume of overseas operations or in foreign currency; however, the above analysis is considered representative of Grupo TMM’s exposure to currency risk. Interest rate risks Grupo TMM’s exposure to the risk of changes in market interest rates is related principally to the long-term debt obligations of Grupo TMM at a variable interest rate. Grupo TMM’s policy is to obtain fixed rated instruments on its loans and, when a loan has a variable interest rate, the Company’s policy is to obtain all needed derivative financial instruments in order to fix this rate. At December 31, 2018, the Company had $288.0 and $327.4 million pesos of debt contracted on fixed and variable rates, respectively. At December 31, 2017, the debt contracted on fixed and variable rates was $319.6 and $578.3 million pesos, respectively. Sensitivity analysis The following table illustrates the sensitivity in operations at December 31, 2018 and 2017 to a reasonably possible change in the interest rates of +/- 1%. These changes are considered to be reasonably possible based on the current market conditions. The calculations are based on a variance in the average market interest rate for each period and the financial instruments on the reporting date that are sensitive to variances in the interest rates. The rest of the variables remain constant. 2018 2017 +1% Variance -1% Variance +1% Variance -1% Variance Profit or loss for the year $ (1,439 ) $ 1,439 $ (2,048 ) $ 2,048 The impact shown in the above sensitivity is considered the same both in the results of operations and in stockholders’ equity. Concentration of risk For the year ended December 31, 2018, the Company obtained revenues from TMM DM (related party), Grupo Celanese and Helmsley Management, which represented 17%, 10% and 9%, respectively. None of the remaining customers represent more than 4% of its total revenues. For the year ended December 31, 2017, the Company obtained revenues from Pemex Exploracion y Produccion, P.M.I Trading Limited and Fieldwood Energy E&P Mexico, which represented 16%, 13%, and 13%, respectively. None of the remaining customers represents more than 5% of the total revenues. The Company permanently monitors the industry development in which its major clients operate, including significant key indicators such as oil prices, to consider it in the process of recognition and measurement of assets and liabilities in the consolidated financial statements. Credit risk Credit risk is managed on a group basis, based on the credit risk management policies and procedures of the Group. Credit risk with respect to cash balances maintained in banks and sight deposits is managed through diversification of bank deposits that are only made with high credited financial institutions. For other receivables, other than trade accounts receivable and contractual assets, the balances are considered immaterial and whose risk of default is null. The Group continuously monitors the creditworthiness of customers, based on its experience and customer profiles defined by Management. The Group’s policy is to deal only with creditworthy counterparties. Credit terms range between 30 and 90 days. Credit terms negotiated with customers are subject to an internal approval process that considers the experience and profile of the customer. Current credit risk is managed by a periodic review of the accounts receivable aging analysis, together with credit limits per customer. Trade accounts receivable consist of a large number of customers in various industries and geographical areas. Guarantees (collateral) The Group does not maintain any guarantee on its trade accounts receivable. In addition, the Company does not have guarantees related to other financing (i.e., other receivables, cash and cash equivalents held in banks). Trade accounts receivable The Group applies the IFRS 9 simplified model of recognizing lifetime expected credit losses for all trade receivables as these items do not have a significant financing component. In measuring the expected credit losses, the trade receivables have been assessed on a collective basis as they possess shared credit risk characteristics. They have been grouped based on the days past due and also according to the geographical location of customers. Expected credit loss rates are based on the sales payment profile over the last 48 months prior to December 2018 and January 1, 2018, respectively, as well as the corresponding historical credit losses during that period. Historical rates are adjusted to reflect current and future macroeconomic factors that affect the customer’s ability to liquidate the unpaid balance. Trade receivables are written off (ie. derecognized) when there is no reasonable expectation of recovery. Failure to make payments within 180 days from the invoice date and failure to engage with the Group on alternative payment arrangement amongst other is considered indicators of no reasonable expectation of recovery. However, industry and client’s practices could generate balances with more than 180 days of aging, for which conclusion is that those balances will be collected. Pursuant to the foregoing, the expected credit loss for trade accounts receivable as at December 31, 2018 and January 1, 2018 was determined as follows: Trade accounts receivable days in arrears Current More than 30 days More than 60 days More than 90 days Total As at December 31, 2018 Expected credit loss rate 0.0 % 0.0 % 5.0 % 28.6 % - Gross carrying value $ 143,566 $ 15,935 $ 12,905 $ 75,777 $ 248,183 Expected credit losses during the lifetime - - 645 21,658 22,303 As at December 31, 2017 Expected credit loss rate 0.0 % 0.0 % 10.3 % 90.3 % - Gross carrying value $ 192,971 $ 23,146 $ 3,569 $ 30,951 $ 250,637 Expected credit losses during the lifetime - - 368 27,942 28,310 Liquidity risk The goal of Grupo TMM is to maintain a balance between the continuity of loans and flexibility through the use of bank loans and securitizations. At December 31, 2018 and 2017, only 36% and 56% , At December 31, 2018 and 2017, the financial liabilities of Grupo TMM have contractual maturities (including interest payments as applicable) are summarized as follows: Current Non-Current In 6 months 6 to 12 months 1 to 4 years More than 4 Years At December 31, 2018 Trade payables $ - $ 240,090 $ - $ - Accounts payable and accrued expenses - 357,523 - - Financial debt 83,185 140,177 392,063 - $ 83,185 $ 737,790 $ 392,063 $ - At December 31, 2017 Trade payables $ - $ 169,072 $ - $ - Accounts payable and accrued expenses - 366,918 - - Financial debt 333,814 168,547 396,257 - $ 333,814 $ 704,537 $ 396,257 $ - The above amounts reflect the contractual cash flows without discount, which may differ from the values registered in the liabilities on the reporting date.

Capital management policies and

Capital management policies and procedures	12 Months Ended
	Dec. 31, 2018
Capital management policies and procedures [Abstract]
Capital management policies and procedures	27 Capital management policies and procedures Grupo TMM’s capital management goal is to ensure the capacity of Grupo TMM to continue as a going concern and to provide its stockholders with an appropriate return on their investment. The Company monitors capital based on the carrying value plus its financial debt. The Company sets its capital amount proportionate to its overall financing structure, meaning, the capital and financial liabilities that are not loans. Grupo TMM manages the capital structure and makes adjustments in light of changes in the economic conditions and the associated risks of the underlying assets. In order to maintain or adjust the capital structure, Grupo TMM may adjust the amount of capital reimbursements to stockholders, or issue new shares or sell assets to reduce its financial debt. At December 31, 2018 and 2017, the capital management is summarized as follows: 2018 2017 Stockholders’ equity $ 2,124,258 $ 2,229,062 Total financial debt 615,425 898,618 Cash and cash equivalents (318,155 ) (461,554 ) General financing $ 297,270 $ 437,064 Ratio of total debt to stockholders’ equity 0.14 0.20

Commitments and contingencies

Commitments and contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and contingencies [Abstract]
Commitments and contingencies	28 Commitments and contingencies Commitments a) Concession fees Pursuant to the concessions under the port and tugboat services are operated, the Company is required to make fixed and variable monthly payments. These payments totaled $18,924 and $17,589 in 2018 and 2017, respectively. Contingencies a) RPS Claim On August 7, 2007, Transportación Marítima Mexicana, S.A. de C.V. (‘TMM’) filed a claim for arbitration against Refined Product Services (“RPS”) for US$50 thousand (approximately $ 982.83 On October 19, 2007, RPS filed a countersuit for US$3.0 million (approximately $58,970), for alleged faults and lack of maintenance involving the tanker vessel Palenque, and also consequential damages for having lost a contract while the vessel was being repaired. The consolidated financial statements did not present any significant claims for payments of loss (RPS) during 2018 and up to the authorization date hereof. TMM’s position against this countersuit is strong, as there are sufficient elements and arguments for defense, also the amount claimed by RPS would appear to be excessive and for non-supported issues. b) Mutual loans between WWS and TMM In December 2007, TMM and Worldwide Services, Ltd. (“WWS”) filed mutual claims; TMM for $393.731 thousand dollars (approximately $7,739), claiming fuel and low return on the performance of the tanker ship Veracruz A, and WWS in the amount of $938 thousand dollars (approximately $18,438), primarily claiming a presumed over-performance of the same ship. As at the date of the authorization of the consolidated financial statements, total claims against TMM amount $2.4 million dollars. However, those claims are considered weak. TMM filed an appeal to have the case dismissed, claiming that the Court has no jurisdiction since the arbitration proceedings were started with the name of the incorrect plaintiff, a partial ruling was handed down in which the case was not dismissed in January 2017. The final ruling will be handed down in the forthcoming months of the authorization of the consolidated financial statements. Company Management believes it has strong arguments to support the claim and to defend its position on the arbitration that is being carrying out. c) ADEMSA secured Certificates of Deposit During 2011 and 2010, ADEMSA issued secured Certificates of Deposit in favor of various financial institutions, goods and/or amounts consigned thereto, which, as a result of the defaults by the producers and on exercising the right conferred by the Certificates, filed claim against ADEMSA for compliance with the obligations to deliver goods covered or payment of the amounts secured. At December 31, 2018 and 2017, the Company held a reserve of $2,461, to settle the ADEMSA obligations, and also in these years, payments were made to financial institutions for $2,893 and $3,993, respectively. As of December 31, 2018 and 2017, the reserve is included in ‘Accounts payable and accrued expenses’. d) Termination of the Consolidation Regimen On February 13, 2014, the Company filed an indirect amparo (writ of relief) against various provisions related to the disappearance of the regimen of fiscal consolidation, offering arguments to demonstrate the unconstitutionality of various provisions violating the guarantees of proportionality, legality, and legal certainty, and also various human rights recognized by the Mexican Constitution and in international treaties to which Mexico is party. Given the diversity of procedures in the tax laws to determine the effects of deconsolidation required by these, and also the various criteria to be used, and the possible results of the acts contested in the amparo amparo That claim was forwarded to the First Division of the Auxiliary Center of the First Region seated in Mexico City for study and resolution. Pursuant to the ruling handed down on February 16, 2016, that Division decided to deny the appeal for constitutional relief (amparo) and protection of Federal Justice petitioned by the Company. Grupo TMM filed a motion for reconsideration against that ruling on March 17, 2016. On September 13, 2017, the judges of the First Division decided to deny the amparo filed by the Company. On April 10, 2018, was published the thick of the sentence issued by the First Chamber of the Supreme Court of Justice of the Nation, so that there is no means of defense whatsoever against the decision of the Supreme Court. The matter has been definitely concluded. This did not implicate any effect for the Company. e) Tax liabilities determined on TMM Suit filed by TMM against the rulings handed down on which various tax liabilities were determined for presumed omitted income tax, corresponding to tax year 2005. On November 5, 2012, the appeal for annulment was allowed to proceed before the former Federal Court of Tax and Administrative Justice. That appeal for annulment was forwarded for study and resolution to the Metropolitan Regional First Division of the Federal Court of Tax and Administrative Justice. On January 30, 2018, TMM was notified of the decision whereby the matter was forwarded to the Full Federal Tax Court of Administrative Justice sitting in Mexico City, no ruling has been handed down thereon as at the issue date of the consolidated financial statements. f) Claim of Grupo TMM against SSA Mexico, S.A. de C.V. (‘SSA’) On August 12, 2016, Grupo TMM filed arbitration proceedings against SSA, whereby it claims a compensation in its benefit in the amount of $119,673 for the improper use of tax losses by SSA. On April 12, 2018, the conclusions of the parties were filed, declaring on June 20, 2018 the final sentence absolving SSA of the claim and condemning it only to the payment of the amount US$335,150, for arbitration expenses plus US$29,580 for concepts of arbitral hearing, which were covered to GTMM by SSA. g) Motions for Annulment against various tax provisions During 2017 and 2016, Grupo TMM filed Motions for Annulment with the Federal Court of Administrative Justice against various decisions of the Tax Administration Service (SAT), on the rejection of deductions (tax year 2007), modifications to the Consolidation Regime for controlled companies (tax year 2005), deferred income tax on consolidation (tax year 2010), and the termination of the consolidation regime (tax year 2013), on which rulings have not been handed down by the courts with competent jurisdiction. h) Other legal proceedings The Company is party to various other legal proceedings and administrative actions, all of which are of an ordinary or routine nature and incidental to its operations. Although it is impossible to predict the outcome of any legal proceeding, in the opinion of the Company’s management, such proceedings and actions should not, individually or in the aggregate, have a material adverse effect on the Company’s financial condition, results of operations or liquidity. i) Operations with related parties Under the Income Tax Law, companies that conduct operations with related parties, nationals or nonresidents, are subject to fiscal limitations and obligations regarding the determination of the prices negotiated, as these must be comparable to those that would be used with or between independent parties on similar operations. In the event the tax authorities were to review the prices and reject the amounts determined, they may demand, an addition to the taxes and accessory charges corresponding (adjustments and surcharges), fines on omitted taxes, which could be for up to 100% of the adjusted tax amount. The Company has significant transactions and relations with related parties, for which the Company holds documentation that confirms the terms of these transactions were conducted in 2016 similarly to transactions between unrelated parties. The Company and its subsidiaries are in the process of completing this study for 2018. j) Other legislation Grupo TMM and Subsidiaries are subject to the laws and ordinances of other countries, as well as international regulations governing maritime transportation and the observance of safety and environmental regulations.

Events subsequent to the report

Events subsequent to the reporting date	12 Months Ended
	Dec. 31, 2018
Events subsequent to the reporting date [Abstract]
Events subsequent to the reporting date	29 Events subsequent to the reporting date On February 14, 2019, Grupo TMM acquired the remaining 50% of the capital stock of Optimus, whereby beginning that date, it is a 100% subsidiary of the Company. The purpose of this acquisition is to continue to develop hydrocarbon and refined oil product storage and transportation infrastructure, such as gasoline, diesel, and turbosine in the Port of Tuxpan, to meet the growing demand thereof.

Authorization of the consolidat

Authorization of the consolidated financial statements	12 Months Ended
	Dec. 31, 2018
Authorization of the consolidated financial statements [Abstract]
Authorization of the consolidated financial statements	30 Authorization of the consolidated financial statements The consolidated financial statements of the Company were authorized by Carlos Pedro Aguilar Mendez on April 29, 2018, in his capacity as Director of Administration and Finance, as well as by the Board of Directors and the General Stockholders’ Meeting, on the same date.

Summary of significant accoun_2

Summary of significant accounting policies (Policies)	12 Months Ended
	Dec. 31, 2018
Summary of significant accounting policies [Abstract]
Basis of consolidation	3.1 Basis of consolidation The consolidated financial statements include the accounts of Grupo TMM and those of its subsidiaries. Grupo TMM controls a subsidiary when it is exposed, or has rights, to variable returns resulting from its involvement with the subsidiary and has the ability to affect those returns through its power over the subsidiary. All subsidiaries have the reporting date of “December 31”, for all years reported. The balances and transactions among subsidiaries have been eliminated for the purposes of consolidation, including balances and unrealized gains on transactions between Grupo TMM’s companies. Unrealized losses on the sale of assets among the Group are eliminated in the consolidation and the asset involved is also reviewed for impairment from a group perspective. Accounting policies of subsidiaries have been adjusted where necessary to ensure consistency with the policies adopted by Grupo TMM. Profit or loss and other comprehensive income of subsidiaries acquired or disposed during the year are recognized from the effective date of acquisition, or up to the effective date of disposal, as applicable. Non-controlling interest, presented as part of the stockholders’ equity, represents the portion of the subsidiary’s profit or loss and net assets that are not held by Grupo TMM. The Company attributes the total comprehensive income or loss of the subsidiaries between the owners of the parent and the non-controlling interest based on their respective ownership interests. Associates and joint ventures Associates are all entities over which Grupo TMM has significant influence but not control, generally accompanying a shareholding between 20% and 50% of the voting rights. A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement having rights to the net assets of the arrangement. Investments in associates and joint ventures are accounted by the equity method and are initially recognized at their acquisition cost. The carrying amount of investments in associates and joint ventures is increased or decreased to recognize Grupo TMM’s share of the profit or loss and other comprehensive income of the associate and joint venture, adjusted where necessary to ensure consistency with the accounting policies of Grupo TMM. Unrealized gains on transactions between Grupo TMM and its associates and joint ventures are eliminated to the extent of Grupo TMM’s interest on those entities. When unrealized losses are eliminated, the asset involved is also tested for impairment.
Business combinations	3.2 Business combinations Grupo TMM applies the acquisition method to accounting for business combinations. The consideration transferred by Grupo TMM to obtain control of a subsidiary is calculated as the sum of the fair values on the acquisition-date of the assets transferred, liabilities incurred, and the equity interests issued by Grupo TMM, which includes, accordingly, the fair value of any asset or liability that arises from the contingent consideration arrangement. Acquisition costs are expensed as incurred. Grupo TMM recognizes identifiable assets acquired and liabilities assumed in the business combination independent of whether these were recognized in acquirer’s financial statements prior to the acquisition. Assets acquired and liabilities assumed are generally measured at their acquisition-date fair value. Goodwill is stated after the individual recognition of identifiable intangible assets. It is calculated as the excess of the sum of a) the fair value of the consideration transferred, b) the amount recognized for any non-controlling interest in the entity acquired, and c) the fair value on the acquisition date of any equity interest in the acquire, over the acquisition-date the fair values of the identifiable net assets. If the fair values of the identifiable net assets exceed the sum calculated above, this excess amount (e.g. gain on a bargain purchase) is immediately recognized in profit or loss
Foreign currency translation	3.3 Foreign currency translation Functional and presentation currency The consolidated financial statements are reported in Mexican pesos, which is also the functional currency of the parent company. Foreign currency balances and transactions Foreign currency transactions are translated into the functional currency of the respective Group entity, using the exchange rates prevailing at the dates of the transactions (spot exchange rate). Foreign exchange gains and losses resulting from the settlement of such transactions and from the measurement of monetary items denominated in foreign currency at year-end exchange rates are recognized in profit or loss. Non-monetary items are not retranslated at year-end and are measured at historical cost (translated using the exchange rates at the transaction date), except for non-monetary items measured at fair value which are translated using the exchange rates at the date when fair value was determined. In the consolidated financial statements of Grupo TMM, all the assets, liabilities, and operations of Grupo TMM’s entities operated in a functional currency other than the Mexican peso (Grupo TMM’s reporting currency) are converted to pesos on consolidation.
Cash and cash equivalents	3.4 Cash and cash equivalents Cash and cash equivalents comprise cash on hand and demand deposits, together with other highly liquid and short-term investments that are readily convertible into known amounts of cash and which are subject to insignificant risk of change in their value.
Materials and supplies	3.5 Materials and supplies Materials and supplies, consisting mainly of fuel and items for the maintenance of property, vessels and equipment, are valued at the lower of the average cost and the net realizable value.
Prepayments	3.6 Prepayments Represent prepayments for services that will be received in the future and are amortized in the period when said services are received.
Property, vessels and equipment	3.7 Property, vessels and equipment Properties and vessels The properties (land and buildings) are measured at fair value, which are determined by external professional valuers every three years or before if the market factors indicate a significant change in the fair value. The last valuation of these assets was in December 2016. The vessels are measured at fair value and at December 31, 2018 and 2017, the revalued amounts were determined using the revenue technique (expected future cash flows). The frequency of the revaluations for this class of assets will be based on the changes of the fair values, meaning when these values significantly differ from their carrying value. The Company has revaluated this class of assets at December 31, 2018 and 2017. The revaluation surplus that is derived from the valuation of properties and vessels is recognized as part of ‘Other comprehensive income items’ and forms part of ‘other capital components’ in stockholders’ investment. A revaluation surplus is credited to income up to an amount equivalent to any revaluation write-down or impairment loss previously recognized income. Any excess is recognized in ‘Other comprehensive income items’ and in stockholders’ equity in the item of ‘Revaluation surplus’. Revaluation write-downs or impairment losses are recognized in ‘Other comprehensive income items’ up to the amount previously recognized on that asset in stockholders’ equity in the item of ‘Revaluation surplus’. Any remaining decrease is recognized in income for the year. Any remaining balance of the revaluation surplus in stockholders’ equity at the time of disposing of the asset that gave rise thereto is reclassified to retained earnings. Moreover, any remaining balance of the revaluation surplus in stockholders’ equity may not be distributed to stockholders. The depreciation of properties and vessels is recognized using the straight-line method to write down its carrying value less its estimated residual value. As no finite useful life for land can be determined, the related carrying amounts are not depreciated. Machinery and equipment Machinery and equipment are stated at construction or acquisition cost, including any cost directly attributable to bringing the assets to the location and condition necessary for them to be capable of operating in the manner intended by Grupo TMM’s Management. Acquisitions through capital leases or charter arrangements with an obligation to purchase are capitalized based on the present value of future minimum payments, recognizing the related liability. Depreciation of machinery and equipment is computed using the straight-line method based on the useful lives of the assets net of the estimated residual value. Recurring maintenance and repair expenditures are charged to operating expenses as incurred. Major repairs to vessels (docks) are capitalized and amortized over the period in which benefits are expected to be received (two to five years for vessels). The material residual values and the estimated useful life are adjusted as necessary, at least once a year. Gains or losses from the disposal of property, vessels and equipment are determined as differences between the disposal proceeds and the carrying amount of the assets and are recognized in profit or loss as part of (‘Other income’), accordingly (see Note 19). Construction in progress Disbursements attributable to construction of assets that are identifiable and may be controlled by the Company are recognized as assets when they meet the following conditions: • it is technically possible to complete the construction of the asset so that it can be available to be used; • management has the intent of completing the asset to use it; • it can be proven that the asset will generate economic benefits in the future; • adequate technical, financial or another type of resources are available to complete the asset; and • the disbursement attributable to the asset during its construction can be determined reliably.
Intangible assets	3.8 Intangible assets Recognition of intangible assets Concession rights Concession rights correspond to payments made for the rights to operate assets under concession, which are stated at cost and are amortized over the terms specified in the corresponding agreements. Software Software licenses acquired are capitalized on the basis of costs incurred to acquire and install the specific software. Trademark The trademark acquired in a business combination that qualifies for separate recognition is considered an intangible asset and is recorded at its fair value. Subsequent measuring All finite-lived intangible assets are accounted for using the cost model by which the net capitalized costs of their residual value are amortized using the straight-line method throughout their estimated useful lives, in the case of the concession rights; these are amortized according to the term specified in the corresponding agreement. The residual values and useful lives are reviewed at each reporting date. The trademark is considered an intangible asset with an indefinite life; therefore it is subject to impairment tests annually as described in Note 13. The amortization is included in the consolidated statement of operations as part of the depreciation, amortization, and loss on revaluation item. Subsequent expenditures to preserve software and trademarks are expensed as incurred.
Impairment testing of long-lived assets	3.9 Impairment testing of long-lived assets For impairment assessment purposes, assets are grouped at the lowest levels for which there are largely independent cash inflows (cash-generating units). As a result, some assets are tested individually for impairment and some are tested at cash-generating unit level. Trademark is allocated to those cash-generating units that are expected to benefit from synergies of a related business combination and represent the lowest level within the Company at which management monitors the trademark. Cash-generating units to which trademark has been allocated (determined by the Grupo TMM’s Management as equivalent to its operating segments) are tested for impairment at least annually. All other individual assets or cash-generating units are tested for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognized for the amount by which the asset’s (or cash-generating unit’s) carrying amount exceeds its recoverable amount, which is the higher of fair value less costs of disposal and value-in-use. To determine the value-in-use, management estimates expected future cash flows from each cash-generating unit and determines a suitable discount rate in order to calculate the present value of those cash flows. The data used for impairment testing procedures are directly linked to the Grupo TMM’s latest approved budget, adjusted as necessary to exclude the effects of future reorganizations and asset enhancements. Discount factors are determined individually for each cash-generating unit and reflect current market assessments of the time value of money and asset-specific risk factors. Impairment losses for cash-generating units reduce first the carrying amount of any goodwill allocated to that cash-generating unit. Any remaining impairment loss is charged pro rata to the other assets in the cash-generating unit. With the exception of the trademark, all assets are subsequently reassessed for indications that an impairment loss previously recognized may no longer exist. An impairment loss is reversed if the asset’s or cash-generating unit’s recoverable amount exceeds its carrying amount.
Leased assets	3.10 Leased assets Financial leases Management applies judgment in considering the substance of a lease agreement. The economic ownership of the leased asset is transferred to the leaseholder if they substantially assume all the risks and rewards related to the ownership of the leased asset. The corresponding asset is then recognized at the start of the lease at the fair value of the leased asset, or if lower, at the present value of the lease payments. A corresponding amount is recognized as a liability for financial leasing, independent of whether some of the lease payments are settled in advance of the lease start date. The corresponding liability decreases by the lease payments net of the financial expenses. The interest component in the lease payment represents a portion of the capital balance outstanding and is recognized in operations as financial costs over the lease period. Notes 3.7 above and 9 describe the depreciation methods and estimated useful lives, respectively, for assets under financial leases. Operating leases All other leases are treated as operating leases. Payments on operating lease agreements are recognized as an expense on a straight-line basis over the lease term. The associated costs, such as maintenance and insurance, are expensed as incurred.
Financial instruments	3.11 Financial instruments Recognition and derecognition Financial assets and financial liabilities are recognised when the Group becomes a party to the contractual provisions of the financial instrument. Financial assets are derecognized when the contractual rights to the cash flow from a financial asset expire, or when the financial asset and all the substantial risks and benefits have been transferred. A financial liability is derecognized as extinguished, discharged, canceled, or expired. Classification and initial measurement of financial assets Except for those trade receivables that do not contain a significant financing component and are measured at the transaction price in accordance with IFRS 15, all financial assets are initially measured at fair value, adjusted by transaction costs (where applicable). Financial assets are classified into the following categories: • amortized cost • fair value through profit or loss (FVTPL) • fair value through other comprehensive income (FVOCI). In the periods presented the Group does not have any financial assets categorized as FVTPL or FVOCI. The classification is determined by both: • the Group’s business model for managing the financial asset; and • the contractual cash flow characteristics of the financial asset. All income and expenses relating to financial assets that are recognized in profit or loss are presented within finance costs, finance income or other financial items, except for impairment of trade receivables which is presented within other expenses. Subsequent measurement of financial assets Financial assets at amortized cost Financial assets are measured at amortized cost if the assets meet the following conditions (and are not designated as FVTPL): • they are held within a business model whose objective is to hold the financial assets and collect its contractual cash flows; and • the contractual terms of the financial assets give rise to cash flows that are solely payments of principal and interest on the principal amount outstanding. After initial recognition, these are measured at amortized cost using the effective interest method. Discounting is omitted where the effect of discounting is immaterial. The Group’s cash and cash equivalents, trade and most other receivables fall into this category of financial instruments. Impairment of financial assets IFRS 9’s impairment requirements use more forward-looking information to recognize expected credit losses – the ‘expected credit loss (ECL) model’. This replaces IAS 39’s ‘incurred loss model’. Instruments within the scope of the new requirements included mainly trade receivables, contract assets recognized and measured under IFRS 15 and other receivables. Recognition of credit losses is no longer dependent on the Group first identifying a credit los event. Instead the Group considers a broader range of information when assessing credit risk and measuring expected credit losses, including past events, current conditions, reasonable and supportable forecasts that affect the expected collectability of the future cash flows of the instrument. The Group makes use of a simplified approach in accounting for trade and other receivables as well as contract assets and records the loss allowance as lifetime expected credit losses. These are the expected shortfalls in contractual cash flows, considering the potential for default at any point during the life of the financial instrument. In calculating, the Group uses its historical experience, external indicators and forward-looking information to calculate the expected credit losses using a provision matrix. The Group assess impairment of trade receivables based on the characteristics of the business segment, when appropriate this assessment is made on a collective basis as they possess shared credit risk characteristics they have been grouped based on the days past due. Refer to Note 26, for a detailed analysis of how the impairment requirements of IFRS 9 are applied. Previous financial asset impairment under IAS 39 In the prior year, the impairment of trade receivables was based on the incurred loss model. Individually significant receivables were considered for impairment when they were past due or when other objective evidence was received that a specific counterparty will default. Classification and measurement of financial liabilities As the accounting for financial liabilities remains largely the same under IFRS 9 compared to IAS 39, the Group’s financial liabilities were not impacted by the adoption of IFRS 9. However, for completeness, the accounting policy is disclosed below. The Group’s financial liabilities include borrowings, trade and other payables. Financial liabilities are initially measured at fair value, and, where applicable, adjusted for transaction costs. Subsequently, financial liabilities are measured at amortized cost using the effective interest method. All interest-related charges are included within finance costs or finance income and included in financing costs or financing income.
Provisions, contingent liabilities and contingent assets	3.12 Provisions, contingent liabilities and contingent assets Provisions are recognized when the present obligations resulting from a past event will probably lead to an outflow of Grupo TMM economic resources and the amounts can be reliably estimated. Timing or amount of the outflow may still be uncertain. A present obligation arises from a presence of a legal or constructive commitment that has resulted from past events. Provisions are not recognized for future operating losses. Provisions are the estimated amounts required to be expended to settle the present obligation based on the most reliable evidence available at the date of the consolidated financial statements, including the risks and uncertainties associated with the present obligation. Provisions are discounted at their present value, where the time value of money is material. Any reimbursement that Grupo TMM can be virtually certain to collect from a third party regarding an obligation is recognized as a separate asset. However, this asset may not exceed the amount for the related provision. All provisions are reviewed on the issuance of the financial statements and adjusted to reflect the current best estimate. When an outflow of economic resources for present obligations is not probable, this is not recognized as a liability, unless it was assumed in the course of a business combination. Such cases are disclosed as contingent liabilities unless the outflow of resources is remote.
Taxes on earnings	3.13 Taxes on earnings Calculation of current income tax is based on tax rates and tax laws that have been enacted or substantially enacted to the reporting date of the consolidated financial statements. Deferred income tax is determined using the liability method, based on temporary differences arising between the tax basis of assets and liabilities and their carrying amounts in the financial statements. Determination of deferred income tax has considered tax rates that will be effective at the time of reversion of the temporary differences. The income tax expense in the statement of profit or loss includes the sum of the deferred tax, which has not been recognized in other comprehensive income or directly in stockholders’ equity, and the current income tax for the year. Deferred tax assets are recognized to the extent that it is probable that future taxable profit against which temporary differences can be utilized will be available (see Note 21). This is assessed based on the Company’s forecast of future operating results, adjusted for significant items that are reconciled for the taxable income and the limits on the use of tax losses and other tax asset carryforwards. Deferred income tax is provided on temporary differences arising on investments in subsidiaries and associates, except where the timing of the reversal of the temporary difference can be controlled and it is probable that the temporary difference will not reverse in the foreseeable future.
Statutory employee profit sharing	3.14 Statutory employee profit sharing The statutory employee profit sharing is determined applying the rate of 10% on taxable income, adjusted as provided for by the Income Tax Law. The statutory employee profit sharing accrued is considered an ordinary expense associated with employee benefits.
Post-employment benefits and benefits for short-term employees	3.15 Post-employment benefits and benefits for short-term employees Post-employment benefits Defined benefit plans The seniority pension to which employees are entitled after 15 years of service and after having retired at the age of 60, are expensed in the years in which the services are rendered (see Note 23). In addition, the Company has pension plans for certain employees who retire after the age of 65 (or early retirement at 60 or 55), in addition to having completed a minimum 15 years of service, which are expensed in the years in which the services are rendered (see Note 23). Under the defined benefits plan, the pension amount an employee will receive upon retirement is determined in reference to the time of service and salary determined for each case based on the plan. The legal obligation of the benefits lies with Grupo TMM, even if the plan’s assets to finance the defined benefits plan are separate. The plan’s assets may include assets specifically designated in a long-term benefit fund. The liability recognized in the consolidated statement of financial position for the defined benefits plans is the present value of the defined benefits obligation (DBO) as of the reporting date less the fair value of the plan assets. Management estimates the DBO annually with the assistance of independent actuaries, based on the standard inflation rate, the salary growth rates, and the mortality rate. The discount factors are determined near the close of each year in reference to the high-quality corporate bonds that are denominated in the currency in which the benefits will be paid and which have maturities similar to the terms of the corresponding pension liability. The net cost for the defined benefits liability period is included in the item ‘Salaries, wages and employee benefits’ in the consolidated statements of profit or loss. Indemnifications Indemnifications that are not substitutive of retirement, paid to personnel who leave the company due to restructuring or any other reason, are charged to the operations for the period when incurred or provisions are created when there is a present obligation of these events, with a probability of an outflow of resources and this obligation can be reasonably estimated. Short-term employee benefits Short-term employee benefits, including vacation entitlement, are current liabilities included in ‘Accounts payable and accrued expenses’, measured at the amount Grupo TMM expects to pay as a result of time not taken; as these liabilities are short-term, they were not discounted as their effect is considered immaterial.
Stockholders' equity	3.16 Stockholders’ equity Common shares are classified as equity. Grupo TMM does not have other equity instruments in addition to its common shares. Incremental costs directly attributable to the issue of new shares or options are shown in equity as a deduction, net of taxes, from the proceeds. Incremental costs directly attributable to the issue of new shares or options are included in the cost of acquisition as part of the purchase consideration. The accumulated losses include all current profits or losses and for previous periods. Other components of equity capital include: • revaluation surplus, including gains from the reevaluation of vessels and properties; • statutory reserve corresponds to the separation of earnings withheld to this reserve; • additional paid-in capital is equivalent to the amount received in excess of the par value of the shares; and • translation result represents the accumulated effect of the change in functional currency.
Recognition of revenue, costs and expenses, and financing costs	3.17 Recognition of revenue, costs and expenses, and financing costs Revenues Group’s revenue arises mainly from services of maritime transportation, logistics and warehousing. To determine whether to recognize revenue, the Group follows a 5-step process: 1. Identifying the contract with a customer 2. Identifying the performance obligations 3. Determining the transaction price 4. Allocating the transaction price to the performance obligations 5. Recognizing revenue when/as performance obligation(s) are satisfied. The Group does not carry out transactions that involve different contracts and on which their characteristics must be combined in accordance with IFRS. Moreover, transactions are not usually carried out that involve different services as part of the same contract; therefore, the total price of the transaction for a contract in all cases is allocated to a single performance obligation, based on their relative independent sales prices. The transaction price for contracts does not consider variable payments, except for certain service payments that are not considered significant in connection with the total revenues of the Group, nor are payments in kind, nor amounts collected on behalf of third parties and nor contemplate a financing component. All revenues are recognized over time, as the Group meets performance obligations by transferring the services promised to its customers. When the Company meets a performance obligation before receiving the payment, the Company already recognizes either a contract asset or a receivable in its consolidated statement of financial position, depending upon if something else is required than only passage of time before the consideration becomes due. The Group generally does not receive payments in connection with performance obligations; therefore, contractual liabilities are not required to be recognized. In obtaining these contracts, the Group incurs immaterial incremental costs. Since the amortization period of these costs would be less than one year, if capitalized, and also that those costs are immaterial, the Group makes use of the practical expedient in IFRS 15.94 and expenses them as they incur. Parcel vessels and Bulk Carriers These revenues are derived from the transportation of merchandise through the Group’s own shipments or third parties, usually in periods ranging between 7 and 30 days. The rate is fixed and it is set at the beginning of the contract, based on the space or capacity required by the customer. The performance obligation is met as the merchandise is transported from the point of origin to the destination Revenues are recognized over time on a straight-line basis during the term of each contract. Given that the costs required for rendering the service under these contracts do not vary significantly, that method provides a reasonable representation of the services transferred. The amounts that remain unbilled at the end of the reporting period are presented in the consolidated statement of financial position as contractual assets, since something additional is required in addition to time elapsed in order for those amounts to become due and payable. The Group generally does not receive advances that exceed the amount of obligations met; therefore, contract liability balances are not generated. Maritime administration services They correspond to revenues for services rendered for contracting, operating, and managing shipments, mainly offshore service providers. The rate for these services is determined by applying a 2.85% profit margin to the costs incurred by the Group for rendering services. This percentage is reviewed annually, and it can be increased under certain circumstances, but by applying it beginning the year subsequent to its modification, these services are considered a single performance obligation. Accordingly, the consideration is totally allocated; revenues are recognized over time as the related costs are incurred by applying the corresponding profit margin. The amounts are billed monthly, in accordance with these referred to above; therefore, neither asset balances nor contract liabilities are generally generated. Ship repair services (Shipyard) and containers They correspond to revenues for minor and major repairs and maintenance to ships made at the facilities of the Group (Shipyard), as well as containers of shipping companies and others such as wharfage. The consideration for the services is fixed, and it is determined in the contract based on the work ordered, including materials and replacement parts, which must be realized in an estimated period for the work, which ranges from 2 days up to 60 days for ships, and from 1 day up to 6 days for containers. Wharfage depends on the considerations of the ship from 1 to 365 days, due to the high degree of interdependence among the various elements of these services. They are recorded in the accounting as a single performance obligation. These revenues are recognized over time in conformity with the completion of the services agreed upon. The Group measures its completion toward total compliance of the performance obligation by comparing real hours invested up to the date with the total estimated hours required to perform the repair or maintenance, including related costs. This base reasonably represents services transferred to each customer, by virtue of the ability of the Group to make reliable estimates based on its significant historical experience in rendering these services. The amounts that remain unbilled at the end of the reporting period are presented in the consolidated statement of financial position as contractual assets, since something additional is required in addition to time passaged in order for those amounts to become due and payable. The Group generally does not receive advances that exceed the amount of obligations met; therefore, contractual asset balances are not generated. Other services The Group obtains revenues for other services such as tugboats, suppliers, negotiations, port formalities, among other things. Most of these services are considered single performance obligations in the terms of the respective contracts, and the consideration is entirely allocated to those performance obligations. Revenues are recognized over time, since customers receive and consume the benefits as the Group renders the services, that is, as the performance obligations are met. The Group does not generate asset balances or contract liabilities for most of these services. The Group acts as an agent for the specific case of agency services and, therefore, it recognizes the revenues corresponding to the profit margin generated net of the costs incurred. Costs and expenses The costs and expenses for maritime, and also those related to other logistics operations, are recognized in operations when the services are rendered, materials are consumed or as incurred. Financing income and costs Interest income and expense are reported as accrued using the effective interest method and are reported as part of the comprehensive financing cost.
Information by segments	3.18 Information by segments Grupo TMM has four operating segments: maritime division, logistics division, ports and terminals division and warehousing division. These operating segments are monitored by the Company’s Management, who are responsible for making strategic decisions, which are made based on adjusted operating segment results. In identifying its operating segments. Management follows Grupo TMM’s service lines, which represent the main services provided by Grupo TMM. Each of these operating segments is managed separately as each of these service lines requires different technologies and other resources as well as marketing approaches. All inter-segment transfers are carried out at market prices. The accounting policies Grupo TMM uses for segment reporting are the same as those used in its consolidated financial statements, with the exception that corporate assets which are not directly attributable to the business activities of any operating segment are not allocated. In the financial periods presented, this primarily applies to the Grupo TMM’s head office.
Significant management judgment in applying accounting policies and estimation uncertainty	3.19 Significant management judgment in applying accounting policies and estimation uncertainty When preparing the consolidated financial statements, Management considers a number of judgments, estimates and assumptions about recognition and measurement of assets, liabilities, income and expenses. Significant management judgment The reporting judgments made by Management as to the application of the accounting policies of Grupo TMM that would have a material effect on the consolidated financial statements are described following: Evaluation of control, significant influence, and joint control Management evaluates the terms of voting power with respect to its investees, the power to govern, decisions, contractual and legal agreements, upon determining if there is control, significant influence, and joint control. Significant judgment is required by evaluating some of these characteristics that can be modified over time (see Note 3.1). Estimation uncertainty Information about estimates and assumptions that have the most significant effect on the recognition and measurement of assets, liabilities, income and expenses is provided below; actual results may be substantially different. Impairment of long-lived assets On assessing impairment, Management determines the recoverable value of each asset or cash generating unit based on the expected future cash flows and determines an adequate interest rate to be able to calculate the present value of these cash flows. The uncertainty in the estimate is related to the assumptions regarding results of future operations and the determination of suitable discount rate. Useful lives of depreciable assets Management reviews the useful lives of the depreciable assets on each reporting date, based on the expected use of each asset. The uncertainty in these estimates is derived from the technical obsolescence that could change the expected use of vessels and other equipment. Defined benefits obligation Management’s estimate of the DBO is based on a number of critical assumptions, such as inflation rates, mortality rates, discount rate, and a consideration for future salary increases. The variances in these assumptions can impact the amount of the DBO and the corresponding annual expense for defined benefits (the analysis is provided in Note 23). Measures of fair value Management uses valuation techniques to measure the fair value of its vessels and properties. This results in Management preparing estimates and assumptions based on market information and using observable data that could be used by market participants to assign a price to the asset, however these are not always available. Moreover, other valuation techniques based on expected future cash flows are used for certain assets, and an interest rate is determined to calculate their present value. These fair value estimates for these non-financial assets can vary from the actual prices obtained on operations at market value on the reporting date, as well as future results and the discount rate (see Note 25).

General information (Tables)

General information (Tables)	12 Months Ended
	Dec. 31, 2018
General information [Abstract]
Percentage of Equity Interest in Various Subsidiaries	At December 31, 2018 and 2017, Grupo TMM holds the percentage of equity interest in various subsidiaries, the most significant are as follows: % of ownership 2018 2017 Maritime Transportación Marítima Mexicana, S.A. de C.V. 100 % 100 % Inmobiliaria Dos Naciones, S. de R.L. de C.V. 100 % 100 % TMM Parcel Tankers, S.A. de C.V. 100 % 100 % Logistics Almacenadora de Depósito Moderno, S.A. de C.V. (Warehouse) 100 % 100 % Autotransportación y Distribución Logística, S.A. de C.V. 100 % 100 % Ports and terminals TMM Logistics, S.A. de C.V. 100 % 100 % Prestadora de Servicios MTR, S.A. de C.V. 100 % 100 % Servicios Administrativos API Acapulco, S.A. de C.V. 51 % 51 % Administración Portuaria Integral de Acapulco S.A. de C.V. 51 % 51 % Payroll outsourcing Mexschiff Operación de Personal, S.A.P.I. de C.V. 100 % 100 % Omexmar Operadora Mexicana Marítima, S.A.P.I. de C.V. 100 % 100 % Perhafen Services Marítimos, S.A.P.I. de C.V. 100 % 100 % TMM Dirección Corporativa, S.A.P.I. de C.V. 100 % 100 % Perjomar Operadora, S.A.P.I. de C.V. 44 % 44 % Property leasing Inmobiliaria TMM, S.A. de C.V. 100 % 100 %

Acquisitions and disposals (Tab

Acquisitions and disposals (Tables)	12 Months Ended
	Dec. 31, 2018
Acquisitions and disposals [Abstract]
Carrying Value of Net Assets and Consideration Received	As at the date of the sale, the carrying value of net assets and the consideration received were as follows: TMM DM Other subsidiaries Total Current assets Cash and cash equivalents $ 212,332 $ - $ 212,332 Trade receivables 537,808 - 537,808 Other current assets 142,956 - 142,956 Total current assets 893,096 - 893,096 Non-current Vessels and equipment, net 7,442,415 - 7,442,415 Other non-current assets 8,530 340,019 348,549 Total assets $ 8,344,041 $ 340,019 $ 8,684,060 Short-term liabilities Trust certificates $ 709,589 - $ 709,589 Other short-term liabilities 439,265 - 439,265 Total short-term liabilities 1,148,854 - 1,148,854 Long-term liabilities Trust certificates 9,731,357 - 9,731,357 Other long-term liabilities 922,297 - 922,297 Total liabilities 11,802,508 - 11,802,508 Total net assets $ (3,458,467 ) 340,019 $ (3,118,448 ) Consideration transferred - (66,987 ) (66,987 ) Investment retained by Grupo TMM - - - (Gain) loss on the disposition of subsidiaries $ (3,458,467 ) $ 273,032 $ (3,185,435 )

Cash and cash equivalents (Tabl

Cash and cash equivalents (Tables)	12 Months Ended
	Dec. 31, 2018
Cash and cash equivalents [Abstract]
Cash and Cash Equivalents	Cash and cash equivalents at December 31, 2018 and 2017, are summarized as follows: 2018 2017 Cash on hand $ 864 $ 925 Cash at banks 123,950 158,035 Short-term investments (a) 154,028 263,123 Restricted cash 39,313 39,471 $ 318,155 $ 461,554 (a) Includes fix-term deposits (promissory notes) and repurchase/resell agreements with terms up to 3 days.

Trade receivables (Tables)

Trade receivables (Tables)	12 Months Ended
	Dec. 31, 2018
Trade receivables [Abstract]
Summary of Trade Receivables	Trade receivables at December 31, 2018 and 2017, are summarized as follows: 2018 2017 Maritime Tugboats $ 26,149 $ 14,033 Shipyards 18,897 30,015 Offshore vessels 13,542 21,719 Parcel tankers 12,350 14,773 Bulk Carrier 1,017 - Others 182 167 Ports and terminals Shipping agencies 39,877 44,426 Port services 8,843 5,154 Commercial leases 233 434 Logistics, warehousing and other businesses Warehousing 47,695 52,034 Repair of containers 31,142 27,489 Automotive services 446 689 Other businesses 1,163 - Total trade receivables 201,536 210,933 Contract assets 68,950 68,014 Allowance for doubtful accounts (22,303 ) (28,310 ) $ 248,183 $ 250,637
Movement in Allowance for Doubtful Accounts	The movement in the allowance for doubtful accounts is presented below: 2018 2017 Balance as at January 1 $ 28,310 $ 35,353 Receivables written off during the year (468 ) (10,482 ) Disincorporation of TMM DM - (9,311 ) Loss allowance (reversed) recognized during the year (5,539 ) 12,750 Balance as at December 31 $ 22,303 $ 28,310

Other accounts receivable (Tabl

Other accounts receivable (Tables)	12 Months Ended
	Dec. 31, 2018
Other accounts receivable [Abstract]
Summary of Other Accounts Receivable	Other accounts receivable at December 31, 2018 and 2017, are summarized as follows: 2018 2017 Recoverable taxes $ 183,927 $ 175,268 Services for port, maritime and other operations 161,037 97,328 Insurance claims 12,286 958 Employees 4,466 8,561 Others 48,718 37,078 $ 410,434 $ 319,193

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Minimum Future Financial Lease Payments	The financial leasing liabilities are secured by the associated assets held under this modality. The minimum future financial leasing payments at the end of each reporting period are: Within the 1st year 1 to 3 years 3 to 5 years After 5 Years Total Balance at December 31, 2018 Lease payments $ 46,055 $ 79,029 $ 174,541 $ - $ 299,625 Financial charges (31,300 ) (46,290 ) (49,294 ) - (126,884 ) Present values, net $ 14,755 $ 32,739 $ 125,247 $ - $ 172,741 Within the 1st year 1 to 3 years 3 to 5 years After 5 Years Total Balance at December 31, 2017 Lease payments $ 39,619 $ 79,346 $ 96,999 $ 117,860 $ 333,824 Financial charges (28,665 ) (51,346 ) (58,456 ) (12,925 ) (151,391 ) Present values, net $ 10,954 $ 28,000 $ 38,543 $ 104,935 $ 182,433
Expiries of Operating Leases	At December 31, 2018, the operating leases report the following expiries: Leased assets Expire Building Apr. 2029 Cranes Jul. 2020 Major vessel maintenance Mar. 2020 Lift truck Dec. 2019 Computer equipment Oct. 2021
Minimum Future Operating Lease Payments	The minimum future payments on operating leases are: Within the 1st year 1 to 3 years 3 to 5 years After 5 Years Total Lease payments At December 31, 2018 $ 82,836 $ 154,026 $ 169,440 $ 527,583 $ 933,885 At December 31, 2017 $ 77,589 $ 143,067 $ 158,278 $ 617,718 $ 996,652

Property, vessels and equipme_2

Property, vessels and equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, vessels and equipment [Abstract]
Summary of Property, Vessels and Equipment	Property, vessels and equipment at December 31, 2018 and 2017 are summarized as follows: 2018 Net balances at year start Additions Disposals Transfers and others Depreciation / loss from revaluation Net balances at year end Estimated useful lives (years) Vessels $ 1,118,250 $ 260 $ 125,019 (c) $ (162,962 ) (a) and (e) $ 47,856 $ 782,673 25 Shipyard 318 - - - 43 275 40 Major vessel maintenance 12,608 38,142 - 4,064 13,203 41,611 2.5 Buildings and facilities 242,204 5,732 - 604 9,639 238,901 20 y 25 Warehousing equipment 647 - 9 - 383 255 10 Computer equipment 556 459 - 47 481 581 3 y 4 Terminal equipment 6,885 2,252 - (125 ) 1,622 7,390 10 Ground transportation equipment 3,751 2,052 1,153 1,940 1,224 5,366 4,5 y 10 Other equipment 7,641 361 - 313 1,236 7,079 1,392,860 49,258 126,181 (156,119 ) 75,687 1,084,131 Land 1,184,427 - 45,295 (d) 7,120 - 1,146,252 Construction in progress 46,248 37,025 - (219 ) - 83,054 $ 2,623,535 $ 86,283 $ 171,476 $ (149,218 ) $ 75,687 $ 2,313,437 2017 Net balances at year start Additions Disposals Transfers and others Depreciation /loss from revaluation Net balances at year end Estimated useful lives (years) Vessels $ 8,028,276 $ 99 $ 2,113 $ (6,424,674 ) (a) $ 483,338 (b) $ 1,118,250 25 Shipyard 363 - - - 45 318 40 Major vessel maintenance 4,457 62,172 - (1,266 ) 52,755 12,608 2.5 Buildings and facilities 253,396 - - - 11,192 242,204 20 Warehousing equipment 1,242 - - - 595 647 10 Computer equipment 794 272 - - 510 556 3 and 4 Terminal equipment 3,319 425 - 4,118 977 6,885 10 Ground transportation equipment 4,203 508 - 1,247 2,207 3,751 4.5 and 10 Other equipment 9,556 226 - (67 ) 2,074 7,641 8,305,606 63,702 2,113 (6,420,642 ) 553,693 1,392,860 Land 1,060,661 - 41 148,807 25,000 1,184,427 Construction in progress 198,605 16,520 13,127 (155,750 ) - 46,248 $ 9,564,872 $ 80,222 $ 15,281 $ (6,427,585 ) $ 578,693 $ 2,623,535 All the amounts for depreciation and for loss from revaluation are included as part of the depreciation, amortization and loss from revaluation on the consolidated statements of profit or loss. The accumulated depreciation on property, vessels and equipment at December 31, 2018 and 2017 is $365,264 and $313,926, respectively. The decrease is basically due to the recognition of the fair value of the vessels; therefore, its accumulated depreciation was cancelled. (a) In 2018 is comprised primarily for revaluation surplus by $161,411. In 2017 is comprised primarily for revaluation surplus by $941,957 net of reduction for deconsolidation of TMM DM in a total of $7,445,415. (b) In 2017 includes $56,213 loss from revaluation of two vessels . (c) On May 7, 2018, was formalized the sale of the chemical tanker Maya to Yangzijiang Express Shipping PTE. LTD, by TMM Parcel Tankers, S.A. de C.V., subsidiary of Grupo TMM. (d) The sale agreement of the land located in Santiago Tlaltepoxco in the Municipality of Huehuetoca, State of Mexico, between Comercializadora Columbia, S.A. de C.V. and Inmobiliaria TMM, S.A. de C.V., a subsidiary of Grupo TMM , (e) At 2018 year end, the supply vessel ‘Subsea 88’ suffered a major mishap in one of its areas and for which it stopped operating. As at December 31, 2018, Grupo TMM was making the corresponding insurance claims without a final settlement having been issued on the mishap as of that date. Since the repair of the ship requires a substantial time that affects future cash flows, Management recognized a loss in fair value in the amount of $206,076 .
Cost Model Revalued Carrying Amounts	If the cost model had been used, the revalued carrying amounts for vessels, land and properties at December 31, 2018 and 2017, would be as follows: 2018 2017 Vessels $ 400,098 $ 452,100 Lands 715,616 715,616 Properties 152,249 156,888 $ 1,267,963 $ 1,324,604

Concession rights (Tables)

Concession rights (Tables)	12 Months Ended
	Dec. 31, 2018
Concession rights [Abstract]
Summary of Concession Rights	The concession rights at December 31, 2018 and 2017 are summarized as follows: 2018 2017 Years to amortize Administración Portuaria Integral de Acapulco (a) $ 94,607 $ 94,607 10 Transportación Marítima Mexicana (b) 30,266 30,266 - 124,873 124,873 Accumulated amortization (115,414 ) (111,629 ) Concession rights, net $ 9,459 $ 13,244 The amortization of the concession rights was $3,785 for the years ended December 31, 2018 and 2017. (a) Concession expires June 2021. (b) Renewal expires January 16, 2023, with the possibility of renewing for another 8 years. In January 2007, the total value of this concession was amortized prior to the renewal.

Other non-current assets (Table

Other non-current assets (Tables)	12 Months Ended
	Dec. 31, 2018
Other non-current assets [Abstract]
Other Non-current Assets	Other non-current assets at December 2018 and 2017 are as follows: 2018 2017 Prepaid expenses $ 42,406 $ 29,535 Security deposits 18,344 7,076 Other equity investments 5,988 5,989 Services & Solutions Optimus, S.A. de C.V. (b) (1,217 ) (1,217 ) Almacenes de Jugos Cítricos de México, S.A.P.I. de C.V. (a) - - TMM División Marítima, S.A. de C.V. (c) - - $ 65,521 $ 41,383 (a) In July 2014, Grupo TMM contributed $40,000 to the capital stock of Almacenes de Jugos Citricos de Mexico, S.A.P.I. de C.V., which represents 21% of the voting shares. Since this entity has not started up operations as at the issue date of the consolidated financial statements, Company Management decided reserve the investment in its entirety. (b) On February 24, 2016, Grupo TMM entered into a ‘Project Development Contract’, through its subsidiary Services & Solutions Optimus, S. de R.L. de C. V. (Optimus) with TransCanada and Sierra Oil & Gas, through its subsidiary Caoba Energia, S. de R.L. de C.V. (an unrelated third party, henceforth ‘Caoba’), whereby a petroleum liquid terminal (‘Tuxpan Project’) will be developed. In accordance with the Project Development Contract, on February 29, 2016, Caoba contributed the capital stock of Optimus in the amount of $4,563, thereby diluting the equity of Grupo TMM to 50%, and granting joint control to the parties to this agreement. The foregoing is classified as a joint venture. In addition, Grupo TMM and Caoba would contribute $6.16 million dollars each one for a total contribution amounting to $12.333 million dollars in the capital stock of Optimus, which should be paid within a period of 3 years as of May 26, 2016. Caoba would make the payment on capital stock through a payment in kind of costs and expenses related to the Tuxpan Project, and Grupo TMM will capitalize that Optimus has in benefit of the Company, derived from the sale of the land (see Notes 19). As discussed in Note 29, on February 14, 2019, the Company acquired the remaining 50% of this joint venture (Optimus) from TransCanada and Sierra Oil & Gas. Consequently, effective on such date, Optimus will be a 100% subsidiary of Grupo TMM. The purpose of this acquisition is to continue to develop hydrocarbon and refined oil product storage and transportation infrastructure, such as gasoline, diesel, and turbosine in the Port of Tuxpan, to meet the growing demand thereof. (c) As discussed in Note 4, the Company lost control of its subsidiary TMM DM in 2017, retaining 15% equity in its capital and exercising significant influence. Accordingly, this investment has been classified as an investment in associate. As at December 31, 2018 and 2017, the value of this investment is nil, since the stockholders’ equity of TMM DM is negative. Moreover, in accordance with the statutes of TMM DM, the stockholders only assume obligation in connection with their equity up to the amount thereof.

Intangible assets (Tables)

Intangible assets (Tables)	12 Months Ended
	Dec. 31, 2018
Intangible assets [Abstract]
Summary of Intangible Assets	Intangible assets at December 31, 2018 and 2017 are summarized as follows: 2018 Net balances at year start Additions (Disposals) Transfers and others Amortization Net balances at year end Estimated useful life (years) Software $ 2,362 $ - $ - $ 1,453 $ 909 3 and 5 Trademark (a) 125,528 - - - 125,528 Indefinite $ 127,890 $ - $ - $ 1,453 $ 126,437 2017 Net balances at year start Additions (Disposals) Transfers and others Amortization Net balances at year end Estimated useful life (years) Software $ 8,114 $ - $ (4,079 ) $ 1,673 $ 2,362 3 and 5 Trademark (a) 125,528 - - - 125,528 Indefinite $ 133,642 $ - $ (4,079 ) $ 1,673 $ 127,890 (a) Corresponds to the rights on the Marmex trademark associated with the specialized maritime division segment, specifically the offshore vessels operation. This trademark is subject to annual impairment testing.

Impairment of long-lived asse_2

Impairment of long-lived assets (Tables)	12 Months Ended
	Dec. 31, 2018
Impairment of long-lived assets [Abstract]
Present Value of Expected Cash Flows for Each Segment	The present value of the cash flows expected for each segment was determined applying an appropriate discount rate. 2018 2017 Growth rate Discount rate Growth rate Discount rate Vessels 2.00 % 7.18 % 2.00 % 7.18 %

Financial assets and liabilit_2

Financial assets and liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Financial assets and liabilities [Abstract]
Financial Assets	The financial assets and liabilities at December 31, 2018 and 2017 are summarized as follows: 2018 2017 Financial assets Valued at amortized cost Cash and cash equivalents $ 278,842 $ 422,083 Restricted cash 39,313 39,471 Trade receivables 179,233 182,623 Other accounts receivable 226,508 143,925 Related parties 207,964 217,188 Total current financial assets $ 931,860 $ 1,005,290
Financial Liabilities	Financial liabilities Valued at amortized cost Short-term portion of the financial debt $ 223,362 $ 502,361 Trade payables 262,090 169,072 Accounts payable and accrued expenses 346,505 339,426 Related parties 18,379 34,756 Total short-term portion of the financial debt 850,336 1,045,615 Long-term financial debt 392,063 396,257 Total financial liabilities $ 1,242,399 $ 1,441,872
Information of Financing	The information for financing at December 31, 2018 and 2017 is summarized as follows: 2018 2017 Short-term Long-term Short-term Long-term Payable in Mexican pesos Daimler Financial Services México, S. de R.L. de C.V $ 8,191 $ 18,579 $ 17,218 $ 21,246 Recognition of debt and substitution of debtor for $40.9 million at a fixed rate of 12%, with monthly payments of principal and interest and maturing November 2019. In order to improve the profile of the schedule of payments, a new debt recognition was formalized on October 11, 2018, in the amount of $28 million at a 12.9% fixed rate, with monthly payments on principal and interest, due October 2021. Banco Autofin México, S.A. Institución de Banca Múltiple 23,342 52,036 19,559 55,930 Five lines of credit with mortgage surety for $45.8, $34.6, $25.5, $21.6, and $8.4 million at a variable rate of the 28- day TIIE plus 450 basis points, with monthly payments of principal and interest, maturing September 2021. On November 26, 2018, a new line of credit was drawn down in the amount of $20 million at a variable rate at 28-day TIIE, plus 550 base points, due November 2023. INPIASA, S.A. de C.V. 1,566 2,610 1,566 4,175 Contract for line of credit, the first for $15.7 million at a variable rate of the 28-day TIIE plus 450 basis points, with monthly payments of principal and interest, and maturing August 2021. Banco del Bajío, S.A. 1,304 - 1,423 1,304 $8.5 million line of credit at a variable rate of the 28-day TIIE plus 250 points, with monthly payments of principal and interest, and maturing November 2019. HSBC, S.A. 1,629 2,173 1,629 3,802 $9.77 million line of credit at a variable rate of the 28-day TIIE plus 300 points, with monthly payments of principal and interest, and maturing April 2021. Banco del Bajío, S.A. Intemza 1,264 842 1,264 2,106 $9.36 million line of credit at a variable rate of the 28-day TIIE plus 250 points, with monthly payments of principal and interest, and maturing August 2020. 2018 2017 Short-term Long-term Short-term Long-term CI Banco S.A. Institución de Banca Múltiple - - 15,000 - $40 million line of credit at a variable rate of the 28-day TIIE plus 150 points, with monthly payments of principal and interest on outstanding balances, and maturing November 2018. Interest payable 6,801 - 2,213 - 44,097 76,240 59,872 88,563 Payable in US dollars DVB Bank América, NV - - 282,677 - Two lines of credit with mortgage surety; the first for US$25.0 million (approximately $485.2 million) at an average rate of 7.42% and maturing May 2017. The second, for US$27.5 million, at an average rate of 7.78%, and maturing June 2017. The restructuring of the payment schedule and outstanding balance amounting to $16 million dollars was formalized in June 2017, with a variable Libor rate at 90 days plus 325 points, with monthly payments on principal and interest on unpaid balances, due June 2018. On May 17, 2018, the total line was prepaid in the original amount of $25 million dollars. The Company was awarded an extension of the due date of the second line, which originally amounted to $27.5 million dollars. It was entirely liquidated on September 19, 2018. ACT Maritime, LLC (c) 15,330 81,452 - - A line of credit at 5 years was contracted in September 2018 in the amount of $5.52 million dollars with a variable Libor rate at 90 days plus 750 points, with quarterly payments of principal and interest, due September 2023. The total credit line that it had with DVB Bank America NV was totally liquidated with the proceeds of this line DEG-Deutsche Investitions – UND 35,382 - 23,682 29,603 US$8.5 million line of credit with pledge surety at 8.01% fixed rate, with semiannual payments of principal and interest on outstanding balances, with a two-year grace period on the principal and maturing July 2014. On September 2, 2016, the restructuring of the outstanding balance amounting to $4.1 million dollars (approximately 80.9 million) by extending the due date up to December 2019, with quarterly payments on principal and interest on the unpaid balance at a variable Libor rate at 90 days plus 550 points for the first 4 quarters, 650 points for the next 4 quarters, 750 points for the net 4 quarters, and finally 900 points for the last 2 quarters. In order to have a better payment profile, the Company is negotiating with the bank to extend the credit term. 2018 2017 Short-term Long-term Short-term Long-term Other (e) 88,455 - 98,677 - Unsecured credits were contracted, each one amounting to $3 million dollars at a fixed rate of 11.25%, with semester payments on principal and interest, originally due January 2016. Both credits were contracted again in January 2017, and $1 million dollars on one of them was paid and both were due in July 2017. The payment rescheduling and outstanding balance amounting to $5 million dollars were formalized in July 2017, with a fixed rate of 11.25% with monthly payments on interest and principal, due July 2018. A new rescheduling of payments and unpaid balance amounting to $4.5 million dollars was formalized in July 2018, with an 11.25% fixed rate with monthly interest payments. The principal amounting to $500 thousand dollars was paid in July 2018, and the balance of 4.5 million dollars is due in July 2019. FTAI Subsea 88, Ltd 14,755 157,986 10,954 171,479 US$10.8 million line of credit through financial leasing, at 15.92% fixed rate with monthly payments of principal and interest on outstanding balances and maturing November 2023. The Company has been in a negotiation process with the finance entity to improve its debt payment profile since October 2018, due to the incident of the ship financed in November 2018. (See Note 9) 153,922 239,438 415,990 201,082 2018 2017 Short-term Long-term Short-term Long-term Payable in euros B V Scheepswerf Damen Gorinchem 25,343 76,385 26,499 106,612 Opening line of credit amounting to $7.58 million euros (approximating $159.2 million), at a 7.0% fixed rate with semester payments on principal and interest on unpaid balances and due November 2022. 25,343 76,385 26,499 106,612 $ 223,362 $ 392,063 $ 502,361 $ 396,257 (a) On October 11, 2018 Company concluded a new restructuring process of the payment schedule due in October 2021. (b) They correspond to judicial and private agreements signed for the debt recognition with respect to Deposit Certificates secured and backed by Almacenadora de Depósito Moderno, S.A. de C.V. (ADEMSA), related party. (c) The total line was prepaid in the original amount of $25 million dollars on May 17, 2018. The Company was awarded an extension of the due date of the second line, which originally amounted to $27.5 million dollars up to September 19, 2018, date on which the line with DVB Bank America, NV was entirely paid. This payment was made with the proceeds of a new line of credit with ACT Maritime, LLC. (Subsidiary of Alterna Capital Partners, LLC.) in the amount of $5.52 million dollars at a 5 year term. (d) The Company formally completed the restructuring of the payment schedule and the new due date will be on December 15, 2019. The Company started negotiations with the Bank to extend the due date of the credit and improve its amortization profile. (e) On July 19, 2018, both loans were re-contracted, extending the term to July 19, 2019. On the date of authorization of issuance of these consolidated financial statements, the Company is up to date with its obligations.
Maturity of Long-term Financial Debt	The maturity of the long-term financial debt at December 31, 2018 and 2017 is as follows: Maturity 2018 2017 2019 $ - $ 115,683 2020 99,363 65,390 2021 95,243 61,711 2022 72,985 48,538 2023 124,472 104,935 $ 392,063 $ 396,257 (a) There is no financing due subsequent to 2023.

Balances and transactions wit_2

Balances and transactions with related parties (Tables)	12 Months Ended
	Dec. 31, 2018
Balances and transactions with related parties [Abstract]
Transactions with Related Parties	The accounts payable and transactions with related parties at December 31, 2018 and 2017 are summarized as follows: 2018 2017 Receivable Payable Receivable Payable Optimus (see Note 11) $ 59,098 $ - $ 59,098 $ - SSA México, S.A. de C.V. (a) - 18,379 - 34,756 TMM DM (b) 148,866 - 158,090 - $ 207,964 $ 18,379 $ 217,188 $ 34,756 (a) SSA México, S.A. de C.V., is a company with which Grupo TMM and Administración Portuaria Integral de Acapulco, S.A. de C.V. conduct leasing operations and consulting. (b) The balances with TMM DM arise due to the loss of control of the latter and are related to the maritime operations of TMM DM with the Group. The most relevant transactions with related parties at December 31, 2018, 2017 and 2016 are summarized as follows: 2018 2017 2016 Income: Gain on sale of fixed assets (see Note 9) $ - $ - $ 54,679 Maritime services provider (c) 187,426 - - Leases (a) 66 788 788 $ 187,492 $ 788 $ 55,467 Expenses: Other expenses (b) $ 366 $ 415 $ 346 (a) Grupo TMM, S.A.B. lease operations with SSA México, S.A. de C.V. (b) Management consulting provided by SSA México, S.A. de C.V. to Administración Portuaria Integral de Acapulco, S.A. de C.V. (c) Maritime services provider between TMM Direccion Corporativa, S.A. de C.V, subsidiary of Grupo TMM and TMM DM, related party.
Transactions Involving Executive Personnel	Transactions involving executive personnel for the years ended December 31, 2018, 2017 and 2016 include the following expenses: 2018 2017 2016 Short-term benefits Salaries 33,790 $ 31,065 $ 37,768 Social security costs 462 471 623 $ 34,252 $ 31,536 $ 38,391

Accounts payable and accrued _2

Accounts payable and accrued expenses (Tables)	12 Months Ended
	Dec. 31, 2018
Accounts payable and accrued expenses [Abstract]
Accounts Payable and Accrued Expenses	Accounts payable and accrued expenses at December 31, 2018 and 2017 are shown as follows: 2018 2017 General expenses $ 149,621 $ 143,409 Purchased services 92,176 91,122 Operating expenses 45,187 42,035 Taxes payable 11,018 1,492 Salaries and wages 1,404 1,678 Other 58,117 62,182 $ 357,523 $ 341,918

Stockholders' equity (Tables)

Stockholders' equity (Tables)	12 Months Ended
	Dec. 31, 2018
Stockholders' equity [Abstract]
Details of Other Components of Equity	Details of other components of equity at December 31, 2018 and 2017 are shown following: Statutory reserve Defined benefit plan Premium on convertible obligations Translation result Revaluation surplus Total Balance at December 31, 2016 $ 216,948 $ (1 36,441 ) $ 77,106 $ (247,668 ) $ 2,353,163 $ 2,263,108 Revaluation of vessels and properties - - - - 941,957 941,957 Defined benefit plan - 319 - - - 319 Reclassification from disposal of properties and depreciation - - - - (2,073,235 ) (a) (2,073,235 ) Total before taxes - 319 - - (1,131,278 ) (1,130,959 ) Tax expense - (96 ) - - (282,587 ) (282,683 ) Total net of taxes - 223 - - (1,413,865 ) (1,413,642 ) Balance at December 31, 2017 $ 216,948 $ (136,218 ) $ 77,106 $ (247,668 ) $ 939,298 $ 849,466 Revaluation of vessels - - - - (161,411 ) (161,411 ) Defined benefit plan - 15,430 - - - 15,430 Reclassification from disposal of properties and depreciation (40,335 ) (40,335 ) Total before taxes - 15,430 - - (201,746 ) (186,316 ) Tax expense - (4,629 ) - - 48,423 43,794 Total net of taxes - 10,801 - - (153,323 ) (142,522 ) Balance at December 31, 2018 $ 216,948 $ (125,417 ) $ 77,106 $ (247,668 ) $ 785,975 $ 706,944 (a) It corresponds to the reclassification of the revaluation surplus to accumulated losses from the sale of properties and to the depreciation of the period of revaluation of properties and vessels.

Revenues (Tables)

Revenues (Tables)	12 Months Ended
	Dec. 31, 2018
Revenues [Abstract]
Summary of Revenue	The revenues at December 31, 2018, 2017 and 2016 are summarized as follows: 2018 2017 2016 Maritime Parcel tankers $ 312,305 $ 298,631 $ 327,202 Maritime administration services 187,426 - - Bulk Carrier 144,664 40,693 - Shypyard 138,517 65,429 68,745 Offshore vessels 56,506 826,264 978,282 Tugboats 70,037 270,225 322,136 Tankers - 450,078 471,220 Ports and terminals Port services 101,688 67,937 64,230 Shipping agencies 64,283 66,259 52,478 Logistics, warehousing and other businesses Repair of containers 234,534 183,966 149,098 Warehousing 160,991 149,894 126,070 Intermodal terminal 47,581 40,677 38,585 Automotive services 4,534 4,886 3,219 Others business - - 46,219 Total consolidated revenue $ 1,523,066 $ 2,464,939 $ 2,647,484

Other income (Tables)

Other income (Tables)	12 Months Ended
	Dec. 31, 2018
Other income [Abstract]
Other Income (Expense)	Other income (expenses) at December 31, 2018, 2017 and 2016 is summarized as follows: 2018 2017 2016 Gain (loss) from the sale of subsidiaries (a) $ 111,484 $ (273,032 ) $ - Recoveries of taxes paid in prior years, net of expenses for recovery (3,919 ) 43,884 - Cancellation of projects (5,604 ) (13,127 ) (6,240 ) Other, net 664 1,554 2,576 Gain from loss of control of subsidiary TMMDM (see Note 4) - 3,458,467 - Income from sale of fixed assets (b) (Note 11) - - 56,534 $ 102,625 $ 3,217,746 $ 52,870 (a) In 2018 and 2017, corresponds to the income from the sale of subsidiaries (see Note 4). (b) It includes the sale of a land to Optimus on June 20, 2016 (see Note 11).

Interest expense and other fi_2

Interest expense and other financial costs (Tables)	12 Months Ended
	Dec. 31, 2018
Interest expense and other financial costs [Abstract]
Interest Expense and Other Financial Costs	This line at December 31, 2018, 2017 and 2016 is comprised as follows: 2018 2017 2016 Interest on other loans $ 80,580 $ 97,590 $ 98,630 Amortization of transaction cost associated with other loans 2,164 4,137 6,011 Other financial expenses 2,146 3,802 3,645 Interest on trust certificates - 942,266 684,829 Transaction cost of mandatorily convertible debentures into shares - 87,482 - Amortization of trust certificate transaction cost - 75,209 76,152 $ 84,890 $ 1,210,486 $ 869,267

Income tax and tax loss carry_2

Income tax and tax loss carryforwards (Tables)	12 Months Ended
	Dec. 31, 2018
Income tax and tax loss carryforwards [Abstract]
Provision for Income Tax Recognized in the Statement of Profit or Loss	The provision for income tax recognized in the statement of profit or loss for the years ended December 31, 2018, 2017 and 2016 is shown following: 2018 2017 2016 Income tax $ (4,799 ) $ (3,000 ) $ (3,433 ) Deferred income tax - (513,732 ) 272,048 Total income tax (expense) benefit $ (4,799 ) $ (516,732 ) $ 268,615
Reconciliation of the Provision for Income Tax	The reconciliation between the provision for income tax based on the statutory income tax rate and the provision recorded by the Company at December 31, 2018, 2017 and 2016 is as follows: 2018 2017 2016 Profit (loss) before taxes $ 28,348 $ 1,846,311 $ (775,179 ) Income tax (8,504 ) (553,893 ) 232,554 (Decrease) increase from: Difference in depreciation and amortization (56,356 ) 503,479 48,701 Revaluation surplus (48,424 ) 265,723 132,019 Income recognized in advance (62 ) (1,678 ) (8,261 ) Materials and supplies (19,888 ) 5,503 (15,673 ) Inflationary and currency exchange effects on monetary assets and liabilities, net (26,686 ) (203,983 ) (102,928 ) Tax losses – net 206,485 (1,255,433 ) 116,906 Provisions and allowance for doubtful accounts (44,609 ) (183,963 ) (63,803 ) Difference between the tax and book value for the sale of assets (15,551 ) (435 ) (60,277 ) Difference between the tax and book value for the sale of shares 20,800 956,613 20,136 Non-deductible expenses (12,004 ) (48,665 ) (30,759 ) Provision for income tax $ (4,799 ) $ (516,732 ) $ 268,615
Components of Deferred Tax Liability	The components of deferred tax liability at December 31, 2018 and 2017 are comprised as follows: 2018 2017 Concession rights and property, vessels and equipment $ (580,703 ) (619,651 ) Portion of tax loss carryforwards for subsequent years 308,380 $ 279,334 Inventories and provisions – net 45,520 65,091 Total deferred tax liability $ (226,803 ) $ (275,226 )
Cumulative Tax Losses	At December 31, 2018, Grupo TMM and its subsidiaries, report the following cumulative tax losses, which are restated applying the INPC factors according to Mexican law. Year in which the loss was incurrred Amounts Year of expiration 2009 $ 87,963 2019 2010 149,754 2020 2011 86,080 2021 2012 184,313 2022 2013 227,106 2023 2014 148,867 2024 2015 64,961 2025 2016 362,084 2026 2017 72,102 2027 2018 183,172 2028 $ 1,566,402

Segment reporting (Tables)

Segment reporting (Tables)	12 Months Ended
	Dec. 31, 2018
Segment reporting [Abstract]
Information for Operating Segments	There are no changes in the measuring methods used to calculate the earnings reported for each segment. The information for each operating segment is as follow: December 31, 2018 Specialized maritime division Logistics division Ports and terminal division Warehousing division Other businesses and shared accounts Total consolidated Revenue $ 909,455 $ 286,649 $ 165,971 $ 160,991 $ - $ 1,523,066 Costs and expenses (727,535 ) (248,364 ) (106,993 ) (165,388 ) (473 ) (1,248,753 ) Corporate expenses - - - - (198,404 ) (198,404 ) Depreciation and amortization (59,451 ) (2,772 ) ( 9,616 ) (1,305 ) (7,133 ) (80,277 ) Trasnportation profit (loss) $ 122,469 $ 35,513 $ 49,362 $ ( 5,702 ) $ (206,010 ) $ (4,368 ) Costs, expenses and revenue not allocated 27,917 Net profit for the year $ 23,549 Total assets by operating segment $ 2,641,105 $ 55,586 $ 1,766,631 $ 238,740 $ - $ 4,702,062 Shared assets - - - - (920,978 ) (920,978 ) Total assets $ 2,641,105 $ 55,586 $ 1,766,631 $ 238,740 $ ( 920,978 ) $ 3,781,084 Total liabilities by operating segment $ 887,042 $ 19,055 $ 255,460 $ 66,515 $ - $ 1,228,072 Shared liabilities - - - - 428,754 428,754 Total liabilities $ 887,042 $ 19,055 $ 255,460 $ 66,515 $ 428,754 $ 1,656,826 Total capital expenditures by segment $ 42,745 $ 592 $ 13,176 $ 582 $ - $ 57,095 Shared capital expenditures - - - - 29,188 29,188 Total capital expenditures $ 42,745 $ 592 $ 13,176 $ 582 $ 29,188 $ 86,283 December 31, 2017 Specialized maritime division Logistics division Ports and terminal division Warehousing division Other and shared accounts Total consolidated Revenue $ 1,951,320 $ 229,529 $ 134,196 $ 149,894 $ - $ 2,464,939 Costs and expenses (1,386,282 ) (193,826 ) (112,771 ) (180,356 ) (1,123 ) (1,874,358 ) Corporate expenses - - - - (205,622 ) (205,622 ) Depreciation and amortization (541,030 ) (1,660 ) (11,143 ) (1,205 ) (7,877 ) (562,915 ) Trasnportation profit (loss) $ 24,008 $ 34,043 $ 10,282 (31,667 ) $ (214,622 ) $ (177,956 ) Costs, expenses and revenue not allocated 1,507,535 Net profit for the year $ 1,329,579 Total assets by operating segment $ 5,617,173 $ 38,833 $ 1,904,928 $ 153,196 $ - $ 7,714,130 Shared assets - (3,589,918 ) (3,589,918 ) Total assets $ 5,617,173 $ 38,833 $ 1,904,928 $ 153,196 $ (3,589,918 ) $ 4,124,212 Total liabilities by operating segment $ 849,416 $ 19,425 $ 256,121 $ 56,296 $ - $ 1,181,258 Shared liabilities - - - - 713,892 713,892 Total liabilities $ 849,416 $ 19,425 $ 256,121 $ 56,296 $ 713,892 $ 1,895,150 Total capital expenditures by segment $ 64,054 $ - $ 9,034 $ 42 $ - $ 73,130 Shared capital expenditures - - - - 7,092 7,092 Total capital expenditures $ 64,054 $ - $ 9.034 $ 42 $ 7,092 $ 80,222 December 31, 2016 Specialized maritime division Logistics division Ports and terminal division Warehousing division Other businesses and shared accounts Total Consolidated Revenue $ 2,167,585 $ 190,902 $ 116,708 $ 126,070 $ 46,219 $ 2,647,484 Costs and expenses (1,385,458 ) (158,403 ) (100,109 ) (169,737 ) (46,460 ) (1,860,167 ) Corporate expenses - - - - (194,215 ) (194,215 ) Depreciation and amortization (534,525 ) (1,908 ) (10,489 ) (947 ) (7,375 ) (555,244 ) Transportation profit (loss) $ 247,602 $ 30,591 $ 6,110 $ (44,614 ) $ (201,831 ) $ 37,858 Costs, expenses and revenue not allocated (544,422 ) Net loss for the year $ (506,564 ) Total assets by operating segment $ 12,830,358 $ 25,929 $ 1,739,936 $ 148,828 $ - $ 14,745,051 Shared assets - - - - (2,821,750 ) (2,821,750 ) Total assets $ 12,830,358 $ 25,929 $ 1,739,936 $ 148,828 $ (2,821,750 ) $ 11,923,301 Total liabilities by operating segment $ 11,107,505 $ 23,874 $ 276,772 $ 47,681 $ - $ 11,455,832 Shared liabilities - - - - (496,521 ) (496,521 ) Total liabilities $ 11,107,505 $ 23,874 $ 276,772 $ 47,681 $ (496,521 ) $ 10,959,311 Total capital expenditures by segment $ 160,691 $ - $ 1,087 $ 139 $ - $ 161,917 Shared capital expenditures - - - - 155 155 Total capital expenditures $ 160,691 $ - $ 1,087 $ 139 $ 155 $ 162,072

Employee benefits (Tables)

Employee benefits (Tables)	12 Months Ended
	Dec. 31, 2018
Employee benefits [Abstract]
Expenses Recognized for Employee Benefits	The expenses recognized for employee benefits are: 2018 2017 2016 Salaries, benefits and inherent $ 347,403 $ 550,491 $ 654,677 Pensions – defined benefit plans 21,211 21,284 (14,764 ) $ 368,614 $ 571,775 $ 639,913
Liabilities Recognized for Pensions and Other Remunerations	The liabilities recognized for pensions and other employee remunerations in the consolidated statement of financial position are comprised as follows: 2018 2017 Long-term: Pensions and seniority premium $ 151,002 $ 150,873 Termination of employment 25,604 24,687 $ 176,606 $ 175,560
Details of Net Cost for the Period	The details of the net cost for the period for seniority premiums and termination of employment, and also the basic actuarial estimates for the calculation of these labor obligations is shown as follows: 2018 2017 Pensions and seniority premiums Termination of employment Pensions and seniority premiums Termination of employment Current service cost $ 4,114 $ 1,858 $ 5,460 $ 1,868 Interest cost 12,994 2,245 12,015 1,941 Net cost for the period $ 17,108 $ 4,103 $ 17,475 $ 3,809
Reserve for Pensions and Seniority Premiums	At December 31, 2018 and 2017, the reserve for pensions and seniority premiums, and also for the termination of employment, is comprised as follows: 2018 2017 Pensions and seniority premiums Termination of employment Pensions and seniority premiums Termination of employment Defined benefit obligations $ 154,128 $ 25,604 $ 153,572 $ 24,687 Plan assets (3,126 ) - (2,699 ) - Total reserve $ 151,002 $ 25,604 $ 150,873 $ 24,687
Defined Benefit Obligation	At December 31, 2018 and 2017, the defined benefit obligations (DBO) for pensions and seniority premiums, and also for the reserve for termination of employment, are comprised as follows: 2018 2017 Pensions and seniority premiums Termination of employment Pensions and seniority premiums Termination of employment DBO at period start $ 153,572 $ 24,687 $ 144,049 $ 21,809 Current service cost 4,114 1,858 5,460 1,868 Interest cost 12,994 2,245 12,015 1,941 Benefits paid (165 ) (214 ) (296 ) - Benefits paid from plan assets (8,840 ) - (9,272 ) - Miscellaneous 300 (18 ) 908 - Actuarial losses and gains (7,847 ) (2,954 ) 708 (931 ) DBO at period end $ 154,128 $ 25,604 $ 153,572 $ 24,687 The plan assets at December 31, 2018 and 2017 are comprised as follows: 2018 2017 Value of the fund at year start $ 2,699 $ 1,651 Expected return on assets 202 908 Plan contributions 8,840 9,272 Benefits paid (8,840 ) (9,272 ) Interests of plan assets 225 140 Value of the fund at year end $ 3,126 $ 2,699
Effects of Changes to Actuarial Assumptions	The changes in the pension plan, seniority premium, and termination of employment plan at December 31, 2018 and 2017 are as follows: 2018 2017 Reserve for obligations at the beginning of the period $ 175,560 $ 164,207 Cost of the period 21,211 21,284 Interest income (225 ) (140 ) Contributions to the plan (8,840 ) - Benefits paid against the reservation (379 ) (9,272 ) Miscellaneous 80 (296 ) Actuarial losses (10,801 ) (223 ) Reserve for obligations at the end of the period $ 176,606 $ 175,560 The significant actuarial assumptions used for the valuation are: 2018 2017 Discount rate 9.25 % 9.25 % Salary increase rate 4.00 % 4.00 % Inflation rate 3.50 % 3.50 % Average working life expectancy 19.30 19.80 The following table summarizes the effects of changes to these actuarial assumptions on the defined benefits obligations at December 31, 2018: 1.0% increase 1.0% decrease Discount rate (Decrease) increase in the defined benefits obligation $ (5,945 ) $ 6,325 1.0% increase 1.0% decrease Salary increase rate Increase (decrease) in the defined benefits obligation $ 4,466 $ (4,227 ) One year Increase One year Decrease Average life expectancies Increase (decrease) in the defined benefits obligation $ 5,134 $ (5,292 )

Fair value measurement (Tables)

Fair value measurement (Tables)	12 Months Ended
	Dec. 31, 2018
Fair value measurement [Abstract]
Non-financial Assets Measured at Fair Value Classified in Level 3	At December 31, 2018 and 2017 non-financial assets measured at fair value are classified in Level 3 of this hierarchy, as described below: 2018 2017 Level 3 Vessels $ 782,673 $ 1,118,250 Buildings and facilities 238,901 242,204 Land 1,146,252 1,184,427 $ 2,167,826 $ 2,544,881
Information Used for Appraisal	The information used for the measurement of fair value at December 31, 2018 was: Tugboats Offshore vessels Parcel Tankers Daily rate or fee 5,897 usd 4,903 usd 12,591 usd Average percentage of utilization 96 % 62 % 94 % Discount rate 7.65 % 7.18 % 7.18 %
Reconciliation Between Carrying Amounts of Non-financial Assets Classified within Level 3	At December 31, 2018 and 2017, the reconciliation between the carrying amounts of non-financial assets classified within Level 3 is as follows: Vessels Buildings and Facilities Balance at January 1, 2018 $ 1,118,250 $ 1,426,631 Amount recognized in other comprehensive income: Revaluation surplus of vessels (161,411 ) - Amount recognized in statements of operations: Loss on revaluation of vessels - - (161,411 ) - Additions and disposals, net (174,166 ) (41,478 ) Balance at December 31, 2018 $ 782,673 $ 1,385,153 Balance at January 1, 2017 $ 8,028,276 $ 1,314,057 Amount recognized in other comprehensive income: Revaluation surplus of vessels 941,957 - Amount recognized in statements of operations: Loss on revaluation of vessels (56,213 ) - 885,744 - Additions and disposals, net (7,795,770 ) 112,574 Balance at December 31, 2017 $ 1,118,250 $ 1,426,631

Financial instruments risk (Tab

Financial instruments risk (Tables)	12 Months Ended
	Dec. 31, 2018
Financial instruments risk [Abstract]
Monetary Assets and Liabilities Denominated in Foreign Currencies	At December 31, 2018 and 2017, the Company held monetary assets and liabilities denominated in foreign currencies other than the Mexican peso, translated at the corresponding interbank exchange rate as related to the Mexican peso, as follows: 2018 2017 US $ Other currencies US $ Other currencies Assets $ 484,443 $ 1,108 $ 548,919 $ 1,120 Liabilities (637,953 ) (103,096 ) (828,367 ) (134,547 ) $ (153,510 ) $ (101,988 ) $ (279,448 ) $ (133,427 )
Sensitivity analysis [Abstract]
Expected Credit Loss for Trade Accounts Receivable	Pursuant to the foregoing, the expected credit loss for trade accounts receivable as at December 31, 2018 and January 1, 2018 was determined as follows: Trade accounts receivable days in arrears Current More than 30 days More than 60 days More than 90 days Total As at December 31, 2018 Expected credit loss rate 0.0 % 0.0 % 5.0 % 28.6 % - Gross carrying value $ 143,566 $ 15,935 $ 12,905 $ 75,777 $ 248,183 Expected credit losses during the lifetime - - 645 21,658 22,303 As at December 31, 2017 Expected credit loss rate 0.0 % 0.0 % 10.3 % 90.3 % - Gross carrying value $ 192,971 $ 23,146 $ 3,569 $ 30,951 $ 250,637 Expected credit losses during the lifetime - - 368 27,942 28,310
Contractual Maturities of Financial Liabilities	At December 31, 2018 and 2017, the financial liabilities of Grupo TMM have contractual maturities (including interest payments as applicable) are summarized as follows: Current Non-Current In 6 months 6 to 12 months 1 to 4 years More than 4 Years At December 31, 2018 Trade payables $ - $ 240,090 $ - $ - Accounts payable and accrued expenses - 357,523 - - Financial debt 83,185 140,177 392,063 - $ 83,185 $ 737,790 $ 392,063 $ - At December 31, 2017 Trade payables $ - $ 169,072 $ - $ - Accounts payable and accrued expenses - 366,918 - - Financial debt 333,814 168,547 396,257 - $ 333,814 $ 704,537 $ 396,257 $ -
Currency Risk [Member]
Sensitivity analysis [Abstract]
Sensitivity Analysis	If the peso had strengthened or weakened against the USD by 0.04% for 2018 and 4.73% for 2017, this would have had the following impact on the monetary position: 2018 2017 0.04% Increase in the exchange rate 0.04% decrease in exchange rate 4.73% Increase in the exchange rate 4.73% decrease in the exchange rate Assets in US dollars $ 155 $ (155 ) $ 25,989 $ (25,989 ) Assets in other currencies (204 ) 204 53 (53 ) Liabilities in US dollars (33 ) 33 (39,219 ) 39,219 Liabilities in other currencies - - (6,370 ) 6,370 $ (82 ) 82 $ (19,547 ) $ 19,547
Interest Rate Risks [Member]
Sensitivity analysis [Abstract]
Sensitivity Analysis	The following table illustrates the sensitivity in operations at December 31, 2018 and 2017 to a reasonably possible change in the interest rates of +/- 1%. These changes are considered to be reasonably possible based on the current market conditions. The calculations are based on a variance in the average market interest rate for each period and the financial instruments on the reporting date that are sensitive to variances in the interest rates. The rest of the variables remain constant. 2018 2017 +1% Variance -1% Variance +1% Variance -1% Variance Profit or loss for the year $ (1,439 ) $ 1,439 $ (2,048 ) $ 2,048

Capital management policies a_2

Capital management policies and procedures (Tables)	12 Months Ended
	Dec. 31, 2018
Capital management policies and procedures [Abstract]
Capital Management Summary	At December 31, 2018 and 2017, the capital management is summarized as follows: 2018 2017 Stockholders’ equity $ 2,124,258 $ 2,229,062 Total financial debt 615,425 898,618 Cash and cash equivalents (318,155 ) (461,554 ) General financing $ 297,270 $ 437,064 Ratio of total debt to stockholders’ equity 0.14 0.20

General information, Corporate

General information, Corporate Events (Details)	Dec. 31, 2018	Dec. 21, 2017
Corporate events [Abstract]
Percentage of shares transferred	100.00%
TMM DM [Member]
Corporate events [Abstract]
Percentage of shares transferred		85.00%

General information, Structure

General information, Structure of Grupo TMM (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Transportacion Maritima Mexicana, S.A. de C.V. [Member] | Maritime [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%
Inmobiliaria Dos Naciones, S. de R.L. de C.V. [Member] | Maritime [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%
TMM Parcel Tankers, S.A. de C.V. [Member] | Maritime [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%
Almacenadora de Deposito Moderno, S.A. de C.V. [Member] | Logistics [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%
Autotransportacion y Distribucion Logistica, S.A. de C.V. [Member] | Logistics [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%
TMM Logistics, S.A. de C.V. [Member] | Ports and Terminals [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%
Prestadora de Servicios MTR, S.A. de C.V. [Member] | Ports and Terminals [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%
Servicios Administrativos API Acapulco, S.A. de C.V. [Member] | Ports and Terminals [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	51.00%	51.00%
Administracion Portuaria Integral de Acapulco S.A. de C.V. [Member] | Ports and Terminals [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	51.00%	51.00%
Mexschiff Operacion de Personal, S.A.P.I. de C.V. [Member] | Payroll Outsourcing [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%
Omexmar Operadora Mexicana Maritima, S.A.P.I. de C.V. [Member] | Payroll Outsourcing [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%
Perhafen Services Maritimos, S.A.P.I. de C.V. [Member] | Payroll Outsourcing [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%
TMM Direccion Corporativa, S.A.P.I. de C.V. [Member] | Payroll Outsourcing [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%
Perjomar Operadora, S.A.P.I. de C.V. [Member] | Payroll Outsourcing [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	44.00%	44.00%
Inmobiliaria TMM, S.A. de C.V. [Member] | Property Leasing [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%

Changes in accounting policies

Changes in accounting policies (Details) - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
IFRS 16 Leases [Abstract]
Future minimum lease payments	$ 933,885	$ 996,652
IFRS 16 Leases [Member]
IFRS 16 Leases [Abstract]
Future minimum lease payments	$ 46,100

Summary of significant accoun_3

Summary of significant accounting policies (Details)	12 Months Ended
	Dec. 31, 2018Segment
Post-employment benefits and benefits for short-term employees [Abstract]
Period of service required for seniority pension entitlement	15 years
Retirement age of employee entitled to seniority pension	60 years
Defined benefits plan, pension plans for certain employees, age of individual	65 years
Information by segments [Abstract]
Number of operating segments	4
Minimum [Member]
Post-employment benefits and benefits for short-term employees [Abstract]
Age of employee considered early retirement, additional pension plan	55 years
Maximum [Member]
Post-employment benefits and benefits for short-term employees [Abstract]
Age of employee considered early retirement, additional pension plan	60 years
Properties [Member]
Property, vessels and equipment [Abstract]
Valuation period of properties	P3Y
Vessels [Member] | Minimum [Member]
Property, vessels and equipment [Abstract]
Period of amortization of repair costs	2 years
Vessels [Member] | Maximum [Member]
Property, vessels and equipment [Abstract]
Period of amortization of repair costs	5 years
Parcel Vessels and Bulk Carriers [Member] | Minimum [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Period revenues derived from transportation of merchandise	7 days
Parcel Vessels and Bulk Carriers [Member] | Maximum [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Period revenues derived from transportation of merchandise	30 days
Maritime Administration Services [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Percentage of profit margin to the costs incurred for services	2.85%
Ship and Container Repair Services [Member] | Vessels [Member] | Minimum [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Period of repair services for ship and containers	2 days
Period of wharfage	1 day
Ship and Container Repair Services [Member] | Vessels [Member] | Maximum [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Period of repair services for ship and containers	60 days
Period of wharfage	365 days
Ship and Container Repair Services [Member] | Container [Member] | Minimum [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Period of repair services for ship and containers	1 day
Ship and Container Repair Services [Member] | Container [Member] | Maximum [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Period of repair services for ship and containers	6 days

Acquisitions and disposals (Det

Acquisitions and disposals (Details) - MXN ($) $ / shares in Units, $ in Thousands	Dec. 21, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries		100.00%
Gain on sale of subsidiaries		$ 111,484	[1]	$ (273,032)	[1]	$ 0
Number of shares of variable capital increase (in shares)		103,760,541		103,760,541
Current assets [Abstract]
Cash and cash equivalents		$ 212,332
Trade receivables		537,808
Other current assets		142,956
Total current assets		893,096
Non-current [Abstract]
Vessels and equipment, net		7,442,415
Other non-current assets		348,549
Total assets		8,684,060
Short-term liabilities [Abstract]
Trust certificates		709,589
Other short-term liabilities		439,265
Total short-term liabilities		1,148,854
Long-term liabilities [Abstract]
Trust certificates		9,731,357
Other long-term liabilities		922,297
Total liabilities		11,802,508
Total net assets		(3,118,448)
Consideration transferred		(66,987)
Investment retained by Grupo TMM		0
(Gain) loss on the disposition of subsidiaries		(3,185,435)
TMM DM [Member]
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries	85.00%
Ownership percentage in subsidiary	100.00%			15.00%
Current assets [Abstract]
Cash and cash equivalents		212,332
Trade receivables		537,808
Other current assets		142,956
Total current assets		893,096
Non-current [Abstract]
Vessels and equipment, net		7,442,415
Other non-current assets		8,530
Total assets		8,344,041
Short-term liabilities [Abstract]
Trust certificates		709,589
Other short-term liabilities		439,265
Total short-term liabilities		1,148,854
Long-term liabilities [Abstract]
Trust certificates		9,731,357
Other long-term liabilities		922,297
Total liabilities		11,802,508
Total net assets		(3,458,467)
Consideration transferred		0
Investment retained by Grupo TMM		0
(Gain) loss on the disposition of subsidiaries		(3,458,467)
TMM DM [Member] | Class II Series B Common Shares [Member]
Disposal of subsidiaries [Abstract]
Amount of variable capital increase	$ 35
Number of shares of variable capital increase (in shares)	42,500,000
Variable capital increase, par value (in pesos per share)	$ 0
Other Subsidiaries [Member]
Current assets [Abstract]
Cash and cash equivalents		0
Trade receivables		0
Other current assets		0
Total current assets		0
Non-current [Abstract]
Vessels and equipment, net		0
Other non-current assets		340,019
Total assets		340,019
Short-term liabilities [Abstract]
Trust certificates		0
Other short-term liabilities		0
Total short-term liabilities		0
Long-term liabilities [Abstract]
Trust certificates		0
Other long-term liabilities		0
Total liabilities		0
Total net assets		340,019
Consideration transferred		(66,987)
Investment retained by Grupo TMM		0
(Gain) loss on the disposition of subsidiaries		$ 273,032
[1]	In 2018 and 2017, corresponds to the income from the sale of subsidiaries (see Note 4).

Cash and cash equivalents (Deta

Cash and cash equivalents (Details) - MXN ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents [Abstract]
Cash on hand		$ 864	$ 925
Cash at banks		123,950	158,035
Short-term investments	[1]	154,028	263,123
Restricted cash (Note 5)		39,313	39,471
Total cash and cash equivalents		$ 318,155	$ 461,554
Maximum period for fix-term deposits (promissory notes) and repurchase/resell agreement		3 years
[1]	Includes fix-term deposits (promissory notes) and repurchase/resell agreements with terms up to 3 days.

Trade receivables (Details)

Trade receivables (Details) - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Trade receivables [Abstract]
Total trade receivables	$ 201,536	$ 210,933
Contract assets	68,950	68,014
Allowance for doubtful accounts	(22,303)	(28,310)	$ (35,353)
Trade receivables, net	248,183	250,637
Maritime [Member] | Tugboats [Member]
Trade receivables [Abstract]
Total trade receivables	26,149	14,033
Maritime [Member] | Shipyards [Member]
Trade receivables [Abstract]
Total trade receivables	18,897	30,015
Maritime [Member] | Offshore Vessels [Member]
Trade receivables [Abstract]
Total trade receivables	13,542	21,719
Maritime [Member] | Parcel Tankers [Member]
Trade receivables [Abstract]
Total trade receivables	12,350	14,773
Maritime [Member] | Bulk Carrier [Member]
Trade receivables [Abstract]
Total trade receivables	1,017	0
Maritime [Member] | Others [Member]
Trade receivables [Abstract]
Total trade receivables	182	167
Ports and Terminals [Member] | Shipping Agencies [Member]
Trade receivables [Abstract]
Total trade receivables	39,877	44,426
Ports and Terminals [Member] | Port Services [Member]
Trade receivables [Abstract]
Total trade receivables	8,843	5,154
Ports and Terminals [Member] | Commercial Leases [Member]
Trade receivables [Abstract]
Total trade receivables	233	434
Logistics, Warehousing and Other Businesses [Member] | Warehousing [Member]
Trade receivables [Abstract]
Total trade receivables	47,695	52,034
Logistics, Warehousing and Other Businesses [Member] | Repair of Containers [Member]
Trade receivables [Abstract]
Total trade receivables	31,142	27,489
Logistics, Warehousing and Other Businesses [Member] | Automotive Services [Member]
Trade receivables [Abstract]
Total trade receivables	446	689
Logistics, Warehousing and Other Businesses [Member] | Other Businesses [Member]
Trade receivables [Abstract]
Total trade receivables	$ 1,163	$ 0

Trade receivables, Movement in

Trade receivables, Movement in Allowance for Doubtful Accounts (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Trade receivables [Abstract]
Beginning balance	$ 28,310	$ 35,353
Receivables written off during the year	(468)	(10,482)
Disincorporation of TMM DM	0	(9,311)
Loss allowance (reversed) recognized during the year	(5,539)	12,750
Ending balance	$ 22,303	$ 28,310

Other accounts receivable (Deta

Other accounts receivable (Details) - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other accounts receivable [Abstract]
Recoverable taxes	$ 183,927	$ 175,268
Services for port, maritime and other operations	161,037	97,328
Insurance claims	12,286	958
Employees	4,466	8,561
Others	48,718	37,078
Other accounts receivable	$ 410,434	$ 319,193

Leases, Financial leases as les

Leases, Financial leases as lessee (Details) - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Minimum future financial lease payments [Abstract]
Lease payments	$ 299,625	$ 333,824
Financial charges	(126,884)	(151,391)
Present values, net	172,741	182,433
Within the 1st Year [Member]
Minimum future financial lease payments [Abstract]
Lease payments	46,055	39,619
Financial charges	(31,300)	(28,665)
Present values, net	14,755	10,954
1 to 3 Years [Member]
Minimum future financial lease payments [Abstract]
Lease payments	79,029	79,346
Financial charges	(46,290)	(51,346)
Present values, net	32,739	28,000
3 to 5 Years [Member]
Minimum future financial lease payments [Abstract]
Lease payments	174,541	96,999
Financial charges	(49,294)	(58,456)
Present values, net	125,247	38,543
After 5 Years [Member]
Minimum future financial lease payments [Abstract]
Lease payments	0	117,860
Financial charges	0	(12,925)
Present values, net	0	104,935
Vessel Subsea 88 [Member] | Carrying Amount [Member]
Financial leases as lessee [Abstract]
Value of finance lease assets	$ 191,377	$ 413,298

Leases, Operating leases as les

Leases, Operating leases as lessee (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Minimum future operating lease payments [Abstract]
Lease payments	$ 933,885	$ 996,652
Within the 1st Year [Member]
Minimum future operating lease payments [Abstract]
Lease payments	82,836	77,589
1 to 3 Years [Member]
Minimum future operating lease payments [Abstract]
Lease payments	154,026	143,067
3 to 5 Years [Member]
Minimum future operating lease payments [Abstract]
Lease payments	169,440	158,278
After 5 Years [Member]
Minimum future operating lease payments [Abstract]
Lease payments	$ 527,583	$ 617,718
Building [Member]
Operating leases as lessee [Abstract]
Leased assets expire	Apr. 1, 2029
Cranes [Member]
Operating leases as lessee [Abstract]
Leased assets expire	Jul. 1, 2020
Major Vessel Maintenance [Member]
Operating leases as lessee [Abstract]
Leased assets expire	Mar. 1, 2020
Lift Truck [Member]
Operating leases as lessee [Abstract]
Leased assets expire	Dec. 1, 2019
Computer Equipment [Member]
Operating leases as lessee [Abstract]
Leased assets expire	Oct. 1, 2021

Property, vessels and equipme_3

Property, vessels and equipment, Summary (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2018MXN ($)		Dec. 31, 2017MXN ($)Vessel
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		$ 2,623,535		$ 9,564,872
Additions		86,283		80,222
Disposals		171,476		15,281
Transfers and others		(149,218)		(6,427,585)
Depreciation/loss from revaluation		75,687		578,693
Net balances at year end		2,313,437		2,623,535
Revaluation surplus		899,863		1,220,277
Accumulated Depreciation and Amortization [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Accumulated depreciation		365,264		313,926
Vessels [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		1,118,250		8,028,276
Additions		260		99
Disposals		125,019	[1]	2,113
Transfers and others	[3]	(162,962)	[2]	(6,424,674)
Depreciation/loss from revaluation		47,856		483,338	[4]
Net balances at year end		$ 782,673		$ 1,118,250
Estimated useful lives (years)		P25Y		P25Y
Property, plant and equipment, revaluation surplus				$ 941,957
Revaluation surplus		$ 161,411		7,445,415
Loss from revaluation				$ 56,213
Number of vessels revaluated | Vessel				2
Loss in fair value		206,076
Shipyard [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		318		$ 363
Additions		0		0
Disposals		0		0
Transfers and others		0		0
Depreciation/loss from revaluation		43		45
Net balances at year end		$ 275		$ 318
Estimated useful lives (years)		P40Y		P40Y
Major Vessel Maintenance [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		$ 12,608		$ 4,457
Additions		38,142		62,172
Disposals		0		0
Transfers and others		4,064		(1,266)
Depreciation/loss from revaluation		13,203		52,755
Net balances at year end		$ 41,611		$ 12,608
Estimated useful lives (years)		P2Y6M		P2Y6M
Buildings and Facilities [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		$ 242,204		$ 253,396
Additions		5,732		0
Disposals		0		0
Transfers and others		604		0
Depreciation/loss from revaluation		9,639		11,192
Net balances at year end		$ 238,901		$ 242,204
Buildings and Facilities [Member] | Minimum [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Estimated useful lives (years)		P20Y		P20Y
Buildings and Facilities [Member] | Maximum [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Estimated useful lives (years)		P25Y		P25Y
Warehousing Equipment [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		$ 647		$ 1,242
Additions		0		0
Disposals		9		0
Transfers and others		0		0
Depreciation/loss from revaluation		383		595
Net balances at year end		$ 255		$ 647
Estimated useful lives (years)		P10Y		P10Y
Computer Equipment [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		$ 556		$ 794
Additions		459		272
Disposals		0		0
Transfers and others		47		0
Depreciation/loss from revaluation		481		510
Net balances at year end		$ 581		$ 556
Computer Equipment [Member] | Minimum [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Estimated useful lives (years)		P3Y		P3Y
Computer Equipment [Member] | Maximum [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Estimated useful lives (years)		P4Y		P4Y
Terminal Equipment [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		$ 6,885		$ 3,319
Additions		2,252		425
Disposals		0		0
Transfers and others		(125)		4,118
Depreciation/loss from revaluation		1,622		977
Net balances at year end		$ 7,390		$ 6,885
Estimated useful lives (years)		P10Y		P10Y
Ground Transportation Equipment [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		$ 3,751		$ 4,203
Additions		2,052		508
Disposals		1,153		0
Transfers and others		1,940		1,247
Depreciation/loss from revaluation		1,224		2,207
Net balances at year end		$ 5,366		$ 3,751
Ground Transportation Equipment [Member] | Minimum [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Estimated useful lives (years)		P4Y6M		P4Y6M
Ground Transportation Equipment [Member] | Maximum [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Estimated useful lives (years)		P10Y		P10Y
Other Equipment [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		$ 7,641		$ 9,556
Additions		361		226
Disposals		0		0
Transfers and others		313		(67)
Depreciation/loss from revaluation		1,236		2,074
Net balances at year end		7,079		7,641
Total Property, Vessels and Equipment, Excluding Land and Construction in Progress [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		1,392,860		8,305,606
Additions		49,258		63,702
Disposals		126,181		2,113
Transfers and others		(156,119)		(6,420,642)
Depreciation/loss from revaluation		75,687		553,693
Net balances at year end		1,084,131		1,392,860
Land [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		1,184,427		1,060,661
Additions		0		0
Disposals		45,295	[5]	41
Transfers and others		7,120		148,807
Depreciation/loss from revaluation		0		25,000
Net balances at year end		1,146,252		1,184,427
Construction in Progress [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at year start		46,248		198,605
Additions		37,025		16,520
Disposals		0		13,127
Transfers and others		(219)		(155,750)
Net balances at year end		$ 83,054		$ 46,248
[1]	On May 7, 2018, was formalized the sale of the chemical tanker Maya to Yangzijiang Express Shipping PTE. LTD, by TMM Parcel Tankers, S.A. de C.V., subsidiary of Grupo TMM.
[2]	(e) At 2018 year end, the supply vessel 'Subsea 88' suffered a major mishap in one of its areas and for which it stopped operating. As at December 31, 2018, Grupo TMM was making the corresponding insurance claims without a final settlement having been issued on the mishap as of that date. Since the repair of the ship requires a substantial time that affects future cash flows, Management recognized a loss in fair value in the amount of $206,076. As at the issue date of the consolidated financial statements, the final opinion has not been issued by the insurance company.
[3]	In 2018 is comprised primarily for revaluation surplus by $161,411. In 2017 is comprised primarily for revaluation surplus by $941,957 net of reduction for deconsolidation of TMM DM in a total of $7,445,415.
[4]	In 2017 includes $56,213 loss from revaluation of two vessels.
[5]	The sale agreement of the land located in Santiago Tlaltepoxco in the Municipality of Huehuetoca, State of Mexico, between Comercializadora Columbia, S.A. de C.V. and Inmobiliaria TMM, S.A. de C.V., a subsidiary of Grupo TMM, was entered into on March 27, 2018.

Property, vessels and equipme_4

Property, vessels and equipment, Cost model (Details) $ in Thousands	Dec. 31, 2018MXN ($)Vessel	Dec. 31, 2017MXN ($)Vessel
Property, vessels and equipment, cost model [Abstract]
Revalued carrying amounts	$ 1,267,963	$ 1,324,604
Revaluation surplus, before taxes	899,863	1,220,277
Vessels [Member]
Property, vessels and equipment, cost model [Abstract]
Revalued carrying amounts	400,098	452,100
Revaluation surplus, before taxes	$ 161,411	$ 7,445,415
Vessels [Member] | FTAI Subsea 88 [Member] | Act Maritime, LLC [Member]
Guarantees [Abstract]
Number of vessels pledged as security | Vessel	4	4
Vessels [Member] | FTAI Subsea 88 [Member] | B. V. Scheepswerf Damen Gorinchem [Member]
Guarantees [Abstract]
Number of vessels pledged as security | Vessel		5
Vessels [Member] | Various Bank Loans [Member]
Guarantees [Abstract]
Number of vessels pledged as security | Vessel	2	2
Lands [Member]
Property, vessels and equipment, cost model [Abstract]
Revalued carrying amounts	$ 715,616	$ 715,616
Properties [Member]
Property, vessels and equipment, cost model [Abstract]
Revalued carrying amounts	$ 152,249	$ 156,888

Concession rights (Details)

Concession rights (Details) - MXN ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concession rights [Abstract]
Concessional rights, gross		$ 126,437	$ 127,890	$ 133,642
Concessional rights, net		9,459	13,244
Amortization expense		1,453	1,673
Concession Rights [Member]
Concession rights [Abstract]
Concessional rights, gross		124,873	124,873
Accumulated amortization		(115,414)	(111,629)
Concessional rights, net		9,459	13,244
Amortization expense		3,785	3,785
Concession Rights [Member] | Administracion Portuaria Integral de Acapulco [Member]
Concession rights [Abstract]
Concessional rights, gross	[1]	$ 94,607	94,607
Years to amortize	[1]	P10Y
Concession Rights [Member] | Transportacion Maritima Mexicana [Member]
Concession rights [Abstract]
Concessional rights, gross	[2]	$ 30,266	$ 30,266
Years to amortize	[2]	P0Y
Concessional arrangement, rights renewal period		8 years
[1]	Concession expires June 2021.
[2]	Renewal expires January 16, 2023, with the possibility of renewing for another 8 years. In January 2007, the total value of this concession was amortized prior to the renewal.

Other non-current assets (Detai

Other non-current assets (Details) $ in Thousands, $ in Thousands		Feb. 14, 2019	May 26, 2016USD ($)	Feb. 29, 2016MXN ($)	Jul. 31, 2014MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2017MXN ($)
Other non-current assets [Abstract]
Prepaid expenses						$ 42,406	$ 29,535
Security deposits						18,344	7,076
Other equity investments						5,988	5,989
Services & Solutions Optimus, S.A. de C.V.	[1]					(1,217)	(1,217)
Almacenes de Jugos Citricos de Mexico, S.A.P.I. de C.V.	[2]					0	0
TMM Division Maritima, S.A. de C.V.	[3]					0	0
Total other non-current assets						$ 65,521	$ 41,383
Optimus [Member]
Joint Ventures [Abstract]
Capital contribution			$ 6,160
Percent ownership in joint venture				50.00%
Optimus [Member] | Subsequent Events [Member]
Joint Ventures [Abstract]
Percentage of remaining capital stock acquired		50.00%
Percent ownership in joint venture		100.00%
Caoba [Member] | Optimus [Member]
Joint Ventures [Abstract]
Capital contribution			6,160	$ 4,563
Contribution payment period						3 years
Caoba and Grupo TMM [Member] | Optimus [Member]
Joint Ventures [Abstract]
Capital contribution			$ 12,333
TMM Division Maritima, S.A. de C.V. [Member]
Subsidiaries [Abstract]
Proportion of ownership interest in subsidiary							15.00%
Almacenes de Jugos Citricos de Mexico, S.A.P.I. de C.V. [Member]
Associates [Abstract]
Equity method investment					$ 40,000
Percentage of voting shares					21.00%
[1]	On February 24, 2016, Grupo TMM entered into a 'Project Development Contract', through its subsidiary Services & Solutions Optimus, S. de R.L. de C. V. (Optimus) with TransCanada and Sierra Oil & Gas, through its subsidiary Caoba Energia, S. de R.L. de C.V. (an unrelated third party, henceforth 'Caoba'), whereby a petroleum liquid terminal ('Tuxpan Project') will be developed. In accordance with the Project Development Contract, on February 29, 2016, Caoba contributed the capital stock of Optimus in the amount of $4,563, thereby diluting the equity of Grupo TMM to 50%, and granting joint control to the parties to this agreement. The foregoing is classified as a joint venture. In addition, Grupo TMM and Caoba would contribute $6.16 million dollars each one for a total contribution amounting to $12.333 million dollars in the capital stock of Optimus, which should be paid within a period of 3 years as of May 26, 2016. Caoba would make the payment on capital stock through a payment in kind of costs and expenses related to the Tuxpan Project, and Grupo TMM will capitalize that Optimus has in benefit of the Company, derived from the sale of the land (see Notes 19). As discussed in Note 29, on February 14, 2019, the Company acquired the remaining 50% of this joint venture (Optimus) from TransCanada and Sierra Oil & Gas. Consequently, effective on such date, Optimus will be a 100% subsidiary of Grupo TMM. The purpose of this acquisition is to continue to develop hydrocarbon and refined oil product storage and transportation infrastructure, such as gasoline, diesel, and turbosine in the Port of Tuxpan, to meet the growing demand thereof.
[2]	In July 2014, Grupo TMM contributed $40,000 to the capital stock of Almacenes de Jugos Citricos de Mexico, S.A.P.I. de C.V., which represents 21% of the voting shares. Since this entity has not started up operations as at the issue date of the consolidated financial statements, Company Management decided reserve the investment in its entirety.
[3]	As discussed in Note 4, the Company lost control of its subsidiary TMM DM in 2017, retaining 15% equity in its capital and exercising significant influence. Accordingly, this investment has been classified as an investment in associate. As at December 31, 2018 and 2017, the value of this investment is nil, since the stockholders' equity of TMM DM is negative. Moreover, in accordance with the statutes of TMM DM, the stockholders only assume obligation in connection with their equity up to the amount thereof.

Intangible assets (Details)

Intangible assets (Details) - MXN ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Summary of intangible assets [Abstract]
Net balances at year start		$ 127,890	$ 133,642
Additions (Disposals)		0	0
Transfers and others		0	(4,079)
Amortization		1,453	1,673
Net balances at year end		126,437	127,890
Software [Member]
Summary of intangible assets [Abstract]
Net balances at year start		2,362	8,114
Additions (Disposals)		0	0
Transfers and others		0	(4,079)
Amortization		1,453	1,673
Net balances at year end		$ 909	$ 2,362
Software [Member] | Minimum [Member]
Summary of intangible assets [Abstract]
Estimated useful life (years)		P3Y	P3Y
Software [Member] | Maximum [Member]
Summary of intangible assets [Abstract]
Estimated useful life (years)		P5Y	P5Y
Software [Member] | Accumulated Amortization [Member]
Summary of intangible assets [Abstract]
Accumulated amortization		$ 4,236	$ 10,822
Trademark [Member]
Summary of intangible assets [Abstract]
Net balances at year start	[1]	125,528	125,528
Additions (Disposals)	[1]	0	0
Transfers and others	[1]	0	0
Net balances at year end	[1]	$ 125,528	$ 125,528
[1]	Corresponds to the rights on the Marmex trademark associated with the specialized maritime division segment, specifically the offshore vessels operation. This trademark is subject to annual impairment testing.

Impairment of long-lived asse_3

Impairment of long-lived assets (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Assets or cash-generating units [Member]
Impairment of long-lived assets [Abstract]
Projection period, calculation of recoverable amounts	P3Y
Increase to discount rate used	1.00%
Decrease in cash-generating unit value	(6.61%)
Vessels and Trademark [Member]
Impairment of long-lived assets [Abstract]
Impairment loss	$ 0	$ 0
Properties [Member]
Impairment of long-lived assets [Abstract]
Impairment loss	0	0
Corporate Assets and Other Long-lived Assets [Member]
Impairment of long-lived assets [Abstract]
Impairment loss	$ 0	$ 0
Vessels [Member]
Impairment of long-lived assets [Abstract]
Growth rate	2.00%	2.00%
Discount rate	7.18%	7.18%

Financial assets and liabilit_3

Financial assets and liabilities, Categories of financial assets and liabilities (Details) - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financial assets [Abstract]
Cash and cash equivalents	$ 278,842	$ 422,083	$ 861,376	$ 1,011,540
Restricted cash (Note 5)	39,313	39,471
Trade receivables	248,183	250,637
Other accounts receivable	410,434	319,193
Related parties	207,964	217,188
Financial liabilities [Abstract]
Short-term portion of the financial debt	223,362	502,361
Trade payables	262,090	169,072
Accounts payable and accrued expenses	357,523	341,918
Related parties	18,379	34,756
Long-term financial debt	392,063	396,257
Financial Liabilities Valued at Amortized Cost [Member]
Financial liabilities [Abstract]
Short-term portion of the financial debt	223,362	502,361
Trade payables	262,090	169,072
Accounts payable and accrued expenses	346,505	339,426
Related parties	18,379	34,756
Total short-term portion of the financial debt	850,336	1,045,615
Long-term financial debt	392,063	396,257
Total financial liabilities	1,242,399	1,441,872
Financial Assets Valued at Amortized Cost [Member]
Financial assets [Abstract]
Cash and cash equivalents	278,842	422,083
Restricted cash (Note 5)	39,313	39,471
Trade receivables	179,233	182,623
Other accounts receivable	226,508	143,925
Related parties	207,964	217,188
Total current financial assets	$ 931,860	$ 1,005,290

Financial assets and liabilit_4

Financial assets and liabilities, Other Financing (Details) € in Thousands, $ in Thousands, $ in Thousands

Sep. 19, 2018USD ($)

May 17, 2018USD ($)

Jan. 31, 2017USD ($)

Jan. 31, 2019USD ($)

Dec. 31, 2018MXN ($)

Dec. 31, 2017MXN ($)

Dec. 31, 2016MXN ($)

Dec. 31, 2018USD ($)

Dec. 31, 2018EUR (€)

Nov. 26, 2018MXN ($)

Oct. 11, 2018MXN ($)

Sep. 30, 2018USD ($)

Jul. 31, 2018USD ($)

Other Financing [Abstract]

Short-term

$ 223,362

$ 502,361

Long-term

392,063

396,257

Short-term interest payable

6,801

2,213

Long-term interest payable

0

0

Debt amount

615,425

898,618

Payment on debt

397,458

172,592

$ 173,439

First 4 Quarters [Member]

Other Financing [Abstract]

Long-term

0

115,683

Second 4 Quarters [Member]

Other Financing [Abstract]

Long-term

99,363

65,390

Third 4 Quarters [Member]

Other Financing [Abstract]

Long-term

95,243

61,711

Last 2 Quarters [Member]

Other Financing [Abstract]

Long-term

72,985

48,538

Daimler Financial Services Mexico, S. de R.L. de C.V. [Member]

Other Financing [Abstract]

Short-term

[1]

8,191

17,218

Long-term

[1]

18,579

21,246

Daimler Financial Services Mexico, S. de R.L. de C.V. [Member] | Debt Obligation - 1 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 40,900

Interest rate

12.00%

12.00%

12.00%

Maturity date

November 2019

Daimler Financial Services Mexico, S. de R.L. de C.V. [Member] | Debt Obligation - 2 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 28,000

Interest rate

12.90%

Maturity date

October 2021

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member]

Other Financing [Abstract]

Short-term

$ 23,342

19,559

Long-term

52,036

55,930

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 1 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 45,800

Variable rate basis

28-day TIIE

Basis points

4.50%

4.50%

4.50%

Maturity date

September 2021

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 2 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 34,600

Variable rate basis

28-day TIIE

Basis points

4.50%

4.50%

4.50%

Maturity date

September 2021

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 3 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 25,500

Variable rate basis

28-day TIIE

Basis points

4.50%

4.50%

4.50%

Maturity date

September 2021

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 4 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 21,600

Variable rate basis

28-day TIIE

Basis points

4.50%

4.50%

4.50%

Maturity date

September 2021

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 5 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 8,400

Variable rate basis

28-day TIIE

Basis points

4.50%

4.50%

4.50%

Maturity date

September 2021

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 6 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 20,000

Variable rate basis

28-day EIIR

Basis points

5.50%

Maturity date

November 2023

INPIASA, S.A. de C.V. [Member]

Other Financing [Abstract]

Short-term

[2]

$ 1,566

1,566

Long-term

[2]

2,610

4,175

INPIASA, S.A. de C.V. [Member] | Line of Credit - 1 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 15,700

Variable rate basis

28-day TIIE

Basis points

4.50%

4.50%

4.50%

Maturity date

August 2021

INPIASA, S.A. de C.V. [Member] | Line of Credit - 2 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Variable rate basis

28-day TIIE

Basis points

4.50%

4.50%

4.50%

Banco del Bajio, S.A. [Member]

Other Financing [Abstract]

Short-term

[2]

$ 1,304

1,423

Long-term

[2]

0

1,304

Banco del Bajio, S.A. [Member] | Line of Credit - 2 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 8,500

Variable rate basis

28-day TIIE

Basis points

2.50%

2.50%

2.50%

Maturity date

November 2019

HSBC, S.A. [Member]

Other Financing [Abstract]

Short-term

[2]

$ 1,629

1,629

Long-term

[2]

2,173

3,802

HSBC, S.A. [Member] | Line of Credit - 1 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 9,770

Variable rate basis

28-day TIIE

Basis points

3.00%

3.00%

3.00%

Maturity date

April 2021

Banco del Bajio, S.A. Intemza [Member]

Other Financing [Abstract]

Short-term

[2]

$ 1,264

1,264

Long-term

[2]

842

2,106

Banco del Bajio, S.A. Intemza [Member] | Line of Credit - 1 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 9,360

Variable rate basis

28-day TIIE

Basis points

2.50%

2.50%

2.50%

Maturity date

August 2020

CI Banco S.A. Institucion de Banca Multiple [Member]

Other Financing [Abstract]

Short-term

$ 0

15,000

Long-term

0

0

CI Banco S.A. Institucion de Banca Multiple [Member] | Line of Credit - 1 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 40,000

Variable rate basis

28-day TIIE

Basis points

1.50%

1.50%

1.50%

Maturity date

November 2018

DVB Bank America, NV [Member]

Other Financing [Abstract]

Short-term

[3]

$ 0

282,677

Long-term

[3]

0

0

DVB Bank America, NV [Member] | Line of Credit - 1 [Member] | Average Rate [Member]

Other Financing [Abstract]

Debt amount

$ 485,200

$ 25,000

Interest rate

7.42%

7.42%

7.42%

Maturity date

May 2017

Payment on debt

$ 25,000

DVB Bank America, NV [Member] | Line of Credit - 2 [Member] | Average Rate [Member]

Other Financing [Abstract]

Debt amount

$ 27,500

Interest rate

7.78%

7.78%

7.78%

Maturity date

June 2017

Payment on debt

$ 27,500

DVB Bank America, NV [Member] | Restructured Line of Credit [Member] | Average Rate [Member]

Other Financing [Abstract]

Debt amount

$ 16,000

Variable rate basis

Libor rate at 90 days

Basis points

3.25%

3.25%

3.25%

Maturity date

June 2018

ACT Maritime, LLC [Member]

Other Financing [Abstract]

Short-term

[3]

$ 15,330

0

Long-term

[3]

$ 81,452

0

ACT Maritime, LLC [Member] | Line of Credit - 1 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 5,520

Variable rate basis

Libor rate at 90 days

Basis points

7.50%

Maturity date

September 2023

Term of debt

5 years

DEG-Deutsche Investitions - UND [Member]

Other Financing [Abstract]

Short-term

[4]

$ 35,382

23,682

Long-term

[4]

$ 0

29,603

DEG-Deutsche Investitions - UND [Member] | Line of Credit - 1 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 8,500

Interest rate

8.01%

8.01%

8.01%

Maturity date

July 2014

Grace period

2 years

DEG-Deutsche Investitions - UND [Member] | Restructured Line of Credit [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 80,900

$ 4,100

Maturity date

December 2019

DEG-Deutsche Investitions - UND [Member] | Restructured Line of Credit [Member] | Variable Rate [Member] | First 4 Quarters [Member]

Other Financing [Abstract]

Variable rate basis

Libor rate at 90 days

Basis points

5.50%

5.50%

5.50%

DEG-Deutsche Investitions - UND [Member] | Restructured Line of Credit [Member] | Variable Rate [Member] | Second 4 Quarters [Member]

Other Financing [Abstract]

Variable rate basis

Libor rate at 90 days

Basis points

6.50%

6.50%

6.50%

DEG-Deutsche Investitions - UND [Member] | Restructured Line of Credit [Member] | Variable Rate [Member] | Third 4 Quarters [Member]

Other Financing [Abstract]

Variable rate basis

Libor rate at 90 days

Basis points

7.50%

7.50%

7.50%

DEG-Deutsche Investitions - UND [Member] | Restructured Line of Credit [Member] | Variable Rate [Member] | Last 2 Quarters [Member]

Other Financing [Abstract]

Variable rate basis

Libor rate at 90 days

Basis points

9.00%

9.00%

9.00%

Other [Member]

Other Financing [Abstract]

Short-term

[5]

$ 88,455

98,677

Long-term

[5]

$ 0

0

Other [Member] | Unsecured Loan - 1 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 3,000

Interest rate

11.25%

11.25%

11.25%

Maturity date

July 2017

Other [Member] | Unsecured Loan - 2 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 3,000

Interest rate

11.25%

11.25%

11.25%

Maturity date

July 2017

Other [Member] | Unsecured Loans [Member]

Other Financing [Abstract]

Payment on debt

$ 1,000

Other [Member] | Unsecured Loans [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 5,000

Interest rate

11.25%

11.25%

11.25%

Maturity date

July 2018

Other [Member] | Unsecured Loans [Member] | Fixed Rate [Member] | Subsequent Events [Member]

Other Financing [Abstract]

Payment on debt

$ 500

Other [Member] | Unsecured Loans Rescheduled [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 4,500

Interest rate

11.25%

Maturity date

July 2019

FTAI Subsea 88 Ltd [Member]

Other Financing [Abstract]

Short-term

$ 14,755

10,954

Long-term

$ 157,986

171,479

FTAI Subsea 88 Ltd [Member] | Financial Lease [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 10,800

Interest rate

15.92%

15.92%

15.92%

Maturity date

November 2023

B V Scheepswerf Damen Gorinchem [Member]

Other Financing [Abstract]

Short-term

$ 25,343

26,499

Long-term

76,385

106,612

B V Scheepswerf Damen Gorinchem [Member] | Line of Credit - 1 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 159,200

€ 7,580

Interest rate

7.00%

7.00%

7.00%

Maturity date

November 2022

Payable in Mexican Pesos [Member]

Other Financing [Abstract]

Short-term

$ 44,097

59,872

Long-term

76,240

88,563

Payable in US Dollars [Member]

Other Financing [Abstract]

Short-term

153,922

415,990

Long-term

239,438

201,082

Payable in Euros [Member]

Other Financing [Abstract]

Short-term

25,343

26,499

Long-term

$ 76,385

$ 106,612

[1]

On October 11, 2018 Company concluded a new restructuring process of the payment schedule due in October 2021.

[2]

They correspond to judicial and private agreements signed for the debt recognition with respect to Deposit Certificates secured and backed by Almacenadora de Deposito Moderno, S.A. de C.V. (ADEMSA), related party.

[3]

The total line was prepaid in the original amount of $25 million dollars on May 17, 2018. The Company was awarded an extension of the due date of the second line, which originally amounted to $27.5 million dollars up to September 19, 2018, date on which the line with DVB Bank America, NV was entirely paid. This payment was made with the proceeds of a new line of credit with ACT Maritime, LLC. (Subsidiary of Alterna Capital Partners, LLC.) in the amount of $5.25 million dollars at a 5 year term.

[4]

The Company formally completed the restructuring of the payment schedule and the new due date will be on December 15, 2019. The Company started negotiations with the Bank to extend the due date of the credit and improve its amortization profile.

[5]

On July 19, 2018, both loans were re-contracted, extending the term to July 19, 2019. On the date of authorization of issuance of these consolidated financial statements, the Company is up to date with its obligations.

Financial assets and liabilit_5

Financial assets and liabilities, Covenants (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Covenants [Abstract]
Long-term financial debt	$ 392,063	$ 396,257
2019 [Member]
Covenants [Abstract]
Long-term financial debt	0	115,683
2020 [Member]
Covenants [Abstract]
Long-term financial debt	99,363	65,390
2021 [Member]
Covenants [Abstract]
Long-term financial debt	95,243	61,711
2022 [Member]
Covenants [Abstract]
Long-term financial debt	72,985	48,538
2023 [Member]
Covenants [Abstract]
Long-term financial debt	124,472	104,935
Trust Certificates and Bank Loans [Member]
Covenants [Abstract]
Interest expense	$ 80,580	$ 1,039,856

Balances and transactions wit_3

Balances and transactions with related parties (Details) - MXN ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balances and transactions with related parties [Abstract]
Receivable		$ 207,964	$ 217,188
Payable		18,379	34,756
Income: [Abstract]
Gain on sale of fixed assets		0	0	$ 54,679
Maritime services provider	[1]	187,426	0	0
Leases	[2]	66	788	788
Income		187,492	788	55,467
Expenses: [Abstract]
Other expenses	[3]	366	415	346
Optimus [Member]
Balances and transactions with related parties [Abstract]
Receivable		59,098	59,098
Payable		0	0
SSA Mexico, S.A. de C.V. [Member]
Balances and transactions with related parties [Abstract]
Receivable	[4]	0	0
Payable	[4]	18,379	34,756
TMM DM [Member]
Balances and transactions with related parties [Abstract]
Receivable	[5]	148,866	158,090
Payable	[5]	0	0
Executive Personnel [Member]
Short-term benefits [abstract]
Salaries		33,790	31,065	37,768
Social security costs		462	471	623
Short-term benefits		$ 34,252	$ 31,536	$ 38,391
[1]	Maritime services provider between TMM Direccion Corporativa, S.A. de C.V, subsidiary of Grupo TMM and TMM DM, related party.
[2]	Grupo TMM, S.A.B. lease operations with SSA Mexico, S.A. de C.V.
[3]	Management consulting provided by SSA Mexico, S.A. de C.V. to Administracion Portuaria Integral de Acapulco, S.A. de C.V.
[4]	SSA Mexico, S.A. de C.V., is a company with which Grupo TMM and Administracion Portuaria Integral de Acapulco, S.A. de C.V. conduct leasing operations and consulting.
[5]	The balances with TMM DM arise due to the loss of control of the latter and are related to the maritime operations of TMM DM with the Group.

Accounts payable and accrued _3

Accounts payable and accrued expenses (Details) - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts payable and accrued expenses [Abstract]
General expenses	$ 149,621	$ 143,409
Purchased services	92,176	91,122
Operating expenses	45,187	42,035
Taxes payable	11,018	1,492
Salaries and wages	1,404	1,678
Other	58,117	62,182
Accounts payable and accrued expenses	$ 357,523	$ 341,918

Stockholders' equity (Details)

Stockholders' equity (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Capital stock [Abstract]
Shares outstanding (in shares)	102,182,841	102,182,841
Net tax profit account (CUFIN) [Abstract]
Income tax rate on CUFIN dividends	10.00%
Period of credit against income tax on CUFIN dividends not drawn	2 years
Capital decreases [Abstract]
Capital Contribution Account balance	$ 4,590,566	$ 4,379,058
CUFIN generated up to December 31, 2013 [Member]
Net tax profit account (CUFIN) [Abstract]
Net tax profit account balance	3,514,258	3,326,220
CUFIN generated beginning 2014 [Member]
Net tax profit account (CUFIN) [Abstract]
Net tax profit account balance	$ 0	$ 0

Stockholders' equity, Other Com

Stockholders' equity, Other Components of equity (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Other components of equity [Abstract]
Balance, beginning of period	$ 2,229,062	$ 963,990		$ 431,806
Revaluation of vessels and properties	(161,411)	941,957		424,634
Defined benefit plan	15,430	319		24,863
Tax expense	43,794	(282,683)		(134,849)
Total net of taxes	(102,187)	659,593		314,648
Balance, end of period	2,124,258	2,229,062		963,990
Statutory Reserve [Member]
Other components of equity [Abstract]
Balance, beginning of period	216,948	216,948
Revaluation of vessels and properties	0	0
Defined benefit plan	0	0
Reclassification from disposal of properties and depreciation	0	0
Total before taxes	0	0
Tax expense	0	0
Total net of taxes	0	0
Balance, end of period	216,948	216,948		216,948
Defined Benefit Plan [Member]
Other components of equity [Abstract]
Balance, beginning of period	(136,218)	(136,441)
Revaluation of vessels and properties	0	0
Defined benefit plan	15,430	319
Reclassification from disposal of properties and depreciation	0	0
Total before taxes	15,430	319
Tax expense	(4,629)	(96)
Total net of taxes	10,801	223
Balance, end of period	(125,417)	(136,218)		(136,441)
Premium on Convertible Obligations [Member]
Other components of equity [Abstract]
Balance, beginning of period	77,106	77,106
Revaluation of vessels and properties	0	0
Defined benefit plan	0	0
Reclassification from disposal of properties and depreciation	0	0
Total before taxes	0	0
Tax expense	0	0
Total net of taxes	0	0
Balance, end of period	77,106	77,106		77,106
Translation Result [Member]
Other components of equity [Abstract]
Balance, beginning of period	(247,668)	(247,668)
Revaluation of vessels and properties	0	0
Defined benefit plan	0	0
Reclassification from disposal of properties and depreciation	0	0
Total before taxes	0	0
Tax expense	0	0
Total net of taxes	0	0
Balance, end of period	(247,668)	(247,668)		(247,668)
Revaluation Surplus [Member]
Other components of equity [Abstract]
Balance, beginning of period	939,298	2,353,163
Revaluation of vessels and properties	(161,411)	941,957
Defined benefit plan	0	0
Reclassification from disposal of properties and depreciation	(40,335)	(2,073,235)	[1]
Total before taxes	(201,746)	(1,131,278)
Tax expense	48,423	(282,587)
Total net of taxes	(153,323)	(1,413,865)
Balance, end of period	785,975	939,298		2,353,163
Other Components of Equity [Member]
Other components of equity [Abstract]
Balance, beginning of period	849,466	2,263,108		2,099,516
Revaluation of vessels and properties	(161,411)	941,957
Defined benefit plan	15,430	319
Reclassification from disposal of properties and depreciation	(40,335)	(2,073,235)
Total before taxes	(186,316)	(1,130,959)
Tax expense	43,794	(282,683)
Total net of taxes	(142,522)	(1,413,642)		163,592
Balance, end of period	$ 706,944	$ 849,466		$ 2,263,108
[1]	It corresponds to the reclassification of the revaluation surplus to accumulated losses from the sale of properties and to the depreciation of the period of revaluation of properties and vessels.

Revenues (Details)

Revenues (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Segment Revenues [Abstract]
Total consolidated revenue	$ 1,523,066	$ 2,464,939	$ 2,647,484
Maritime [Member] | Parcel Tankers [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	312,305	298,631	327,202
Maritime [Member] | Maritime Administration Services [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	187,426	0	0
Maritime [Member] | Bulk Carrier [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	144,664	40,693	0
Maritime [Member] | Shipyards [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	138,517	65,429	68,745
Maritime [Member] | Offshore Vessels [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	56,506	826,264	978,282
Maritime [Member] | Tugboats [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	70,037	270,225	322,136
Maritime [Member] | Tankers [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	0	450,078	471,220
Ports and Terminals [Member] | Port Services [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	101,688	67,937	64,230
Ports and Terminals [Member] | Shipping Agencies [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	64,283	66,259	52,478
Logistics, Warehousing and Other Businesses [Member] | Repair of Containers [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	234,534	183,966	149,098
Logistics, Warehousing and Other Businesses [Member] | Warehousing [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	160,991	149,894	126,070
Logistics, Warehousing and Other Businesses [Member] | Intermodal Terminal [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	47,581	40,677	38,585
Logistics, Warehousing and Other Businesses [Member] | Automotive Services [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	4,534	4,886	3,219
Logistics, Warehousing and Other Businesses [Member] | Other Businesses [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	$ 0	$ 0	$ 46,219

Other income (Details)

Other income (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Other income [Abstract]
Gain (loss) from the sale of subsidiaries	$ 111,484	[1]	$ (273,032)	[1]	$ 0
Recoveries of taxes paid in prior years, net of expenses for recovery	(3,919)		43,884		0
Cancellation of projects	(5,604)		(13,127)		(6,240)
Other, net	664		1,554		2,576
Gain from loss of control of subsidiary TMMDM (see Note 4)	0		3,458,467		0
Income from sale of fixed assets	0		0		56,534	[2]
Other income (expenses)	$ 102,625		$ 3,217,746		$ 52,870
[1]	In 2018 and 2017, corresponds to the income from the sale of subsidiaries (see Note 4).
[2]	It includes the sale of a land to Optimus on June 20, 2016 (see Note 11).

Interest expense and other fi_3

Interest expense and other financial costs (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest expense and other financial costs [Abstract]
Interest on other loans	$ 80,580	$ 97,590	$ 98,630
Amortization of transaction cost associated with other loans	2,164	4,137	6,011
Other financial expenses	2,146	3,802	3,645
Interest on trust certificates	0	942,266	684,829
Transaction cost of mandatorily convertible debentures into shares	0	87,482	0
Amortization of trust certificate transaction cost	0	75,209	76,152
Interest expense and other financial costs	$ 84,890	$ 1,210,486	$ 869,267

Income tax and tax loss carry_3

Income tax and tax loss carryforwards, Results for the year (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Results for the year [Abstract]
Combined tax profits (losses)	$ 28,348	$ 1,846,311	$ (775,179)
Income on taxes recognized	$ 4,799	$ 516,732	$ (268,615)
Enacted Income Tax Law rate	30.00%	30.00%	30.00%
Provision for income tax recognized in statement of profit or loss [Abstract]
Income tax	$ (4,799)	$ (3,000)	$ (3,433)
Deferred income tax	0	(513,732)	272,048
Total income tax (expense) benefit	(4,799)	(516,732)	$ 268,615
Grupo TMM and Subsidiaries [Member]
Results for the year [Abstract]
Combined tax profits (losses)	157,448	(432,139)
Subsidiaries [Member]
Results for the year [Abstract]
Income on taxes recognized	15,997	10,000
Provision for income tax recognized in statement of profit or loss [Abstract]
Total income tax (expense) benefit	$ (15,997)	$ (10,000)

Income tax and tax loss carry_4

Income tax and tax loss carryforwards, Reconciliation for income tax based on statutory rate (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation between provision for income tax based on statutory income tax rate and provision recorded [Abstract]
Profit (loss) before taxes	$ 28,348	$ 1,846,311	$ (775,179)
Income tax	(8,504)	(553,893)	232,554
(Decrease) increase from [Abstract]
Difference in depreciation and amortization	(56,356)	503,479	48,701
Revaluation surplus	(48,424)	265,723	132,019
Income recognized in advance	(62)	(1,678)	(8,261)
Materials and supplies	(19,888)	5,503	(15,673)
Inflationary and currency exchange effects on monetary assets and liabilities, net	(26,686)	(203,983)	(102,928)
Tax losses - net	206,485	(1,255,433)	116,906
Provisions and allowance for doubtful accounts	(44,609)	(183,963)	(63,803)
Difference between the tax and book value for the sale of assets	(15,551)	(435)	(60,277)
Difference between the tax and book value for the sale of shares	20,800	956,613	20,136
Non-deductible expenses	(12,004)	(48,665)	(30,759)
Total income tax (expense) benefit	$ (4,799)	$ (516,732)	$ 268,615

Income tax and tax loss carry_5

Income tax and tax loss carryforwards, Components of deferred tax liability (Details) - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Components of deferred tax liability [Abstract]
Concession rights and property, vessels and equipment	$ (580,703)	$ (619,651)
Portion of tax loss carryforwards for subsequent years	308,380	279,334
Inventories and provisions - net	45,520	65,091
Total deferred tax liability	$ (226,803)	$ (275,226)

Income tax and tax loss carry_6

Income tax and tax loss carryforwards, Tax loss carryforwards (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018MXN ($)
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 1,566,402
2009 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 87,963
Year of expiration	2019
2010 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 149,754
Year of expiration	2020
2011 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 86,080
Year of expiration	2021
2012 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 184,313
Year of expiration	2022
2013 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 227,106
Year of expiration	2023
2014 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 148,867
Year of expiration	2024
2015 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 64,961
Year of expiration	2025
2016 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 362,084
Year of expiration	2026
2017 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 72,102
Year of expiration	2027
2018 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 183,172
Year of expiration	2028

Segment reporting (Details)

Segment reporting (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment reporting [Abstract]
Revenue	$ 1,523,066	$ 2,464,939	$ 2,647,484
Costs and expenses	(1,248,753)	(1,874,358)	(1,860,167)
Corporate expenses	(198,404)	(205,622)	(194,215)
Depreciation and amortization	(80,277)	(562,915)	(555,244)
Transportation (loss) profit	(4,368)	(177,956)	37,858
Net profit (loss) for the year	23,549	1,329,579	(506,564)
Total assets	3,781,084	4,124,212	11,923,301
Total liabilities	1,656,826	1,895,150	10,959,311
Total capital expenditures	86,283	80,222	162,072
Operating Segments [Member]
Segment reporting [Abstract]
Total assets	4,702,062	7,714,130	14,745,051
Total liabilities	1,228,072	1,181,258	11,455,832
Total capital expenditures	57,095	73,130	161,917
Operating Segments [Member] | Specialized Maritime Division [Member]
Segment reporting [Abstract]
Revenue	909,455	1,951,320	2,167,585
Costs and expenses	(727,535)	(1,386,282)	(1,385,458)
Depreciation and amortization	(59,451)	(541,030)	(534,525)
Transportation (loss) profit	122,469	24,008	247,602
Total assets	2,641,105	5,617,173	12,830,358
Total liabilities	887,042	849,416	11,107,505
Total capital expenditures	42,745	64,054	160,691
Operating Segments [Member] | Logistics Division [Member]
Segment reporting [Abstract]
Revenue	286,649	229,529	190,902
Costs and expenses	(248,364)	(193,826)	(158,403)
Depreciation and amortization	(2,772)	(1,660)	(1,908)
Transportation (loss) profit	35,513	34,043	30,591
Total assets	55,586	38,833	25,929
Total liabilities	19,055	19,425	23,874
Total capital expenditures	592	0	0
Operating Segments [Member] | Ports and Terminal Division [Member]
Segment reporting [Abstract]
Revenue	165,971	134,196	116,708
Costs and expenses	(106,993)	(112,771)	(100,109)
Depreciation and amortization	(9,616)	(11,143)	(10,489)
Transportation (loss) profit	49,362	10,282	6,110
Total assets	1,766,631	1,904,928	1,739,936
Total liabilities	255,460	256,121	276,772
Total capital expenditures	13,176	9,034	1,087
Operating Segments [Member] | Warehousing Division [Member]
Segment reporting [Abstract]
Revenue	160,991	149,894	126,070
Costs and expenses	(165,388)	(180,356)	(169,737)
Depreciation and amortization	(1,305)	(1,205)	(947)
Transportation (loss) profit	(5,702)	(31,667)	(44,614)
Total assets	238,740	153,196	148,828
Total liabilities	66,515	56,296	47,681
Total capital expenditures	582	42	139
Shared Accounts [Member] | Other Businesses [Member]
Segment reporting [Abstract]
Revenue	0	0	46,219
Costs and expenses	(473)	(1,123)	(46,460)
Corporate expenses	(198,404)	(205,622)	(194,215)
Depreciation and amortization	(7,133)	(7,877)	(7,375)
Transportation (loss) profit	(206,010)	(214,622)	(201,831)
Total assets	(920,978)	(3,589,918)	(2,821,750)
Total liabilities	428,754	713,892	(496,521)
Total capital expenditures	29,188	7,092	155
Unallocated Amounts [Member]
Segment reporting [Abstract]
Transportation (loss) profit	$ 27,917	$ 1,507,535	$ (544,422)

Employee benefits, Expenses and

Employee benefits, Expenses and liabilities recognized for pensions and other employee remunerations (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Expenses recognized [Abstract]
Salaries, benefits and inherent	$ 347,403	$ 550,491	$ 654,677
Pensions - defined benefit plans	21,211	21,284	(14,764)
Employee benefits expense	368,614	571,775	$ 639,913
Long-term [Abstract]
Employee benefits	176,606	175,560
Short term liabilities and remunerations [Abstract]
Short-term employee benefits accruals	1,404	1,678
Actuarial (loss) gain net of taxes	10,801	223
Pensions and Seniority Premiums [Member]
Long-term [Abstract]
Employee benefits	151,002	150,873
Termination of Employment [Member]
Long-term [Abstract]
Employee benefits	$ 25,604	$ 24,687

Employee benefits, Net cost for

Employee benefits, Net cost for period (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Details for net cost [Abstract]
Interest cost	$ (225)	$ (140)
Net cost for the period	21,211	21,284
Pensions and Seniority Premiums [Member]
Details for net cost [Abstract]
Current service cost	4,114	5,460
Interest cost	12,994	12,015
Net cost for the period	17,108	17,475
Termination of Employment [Member]
Details for net cost [Abstract]
Current service cost	1,858	1,868
Interest cost	2,245	1,941
Net cost for the period	$ 4,103	$ 3,809

Employee benefits, Reserve (Det

Employee benefits, Reserve (Details) - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	$ 176,606	$ 175,560
Pensions and Seniority Premiums [Member]
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	151,002	150,873
Pensions and Seniority Premiums [Member] | Defined Benefit Obligations [Member]
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	154,128	153,572
Pensions and Seniority Premiums [Member] | Plan Assets [Member]
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	(3,126)	(2,699)
Termination of Employment [Member]
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	25,604	24,687
Termination of Employment [Member] | Defined Benefit Obligations [Member]
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	25,604	24,687
Termination of Employment [Member] | Plan Assets [Member]
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	$ 0	$ 0

Employee benefits, Defined bene

Employee benefits, Defined benefit obligation (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [abstract]
Balance at period start	$ 175,560	$ 164,207
Interest cost	(225)	(140)
Benefits paid	(379)	(9,272)
Miscellaneous	80	(296)
Actuarial losses and gains	(10,801)	(223)
Balance at period end	176,606	175,560
Pensions and Seniority Premiums [Member]
Disclosure of net defined benefit liability (asset) [abstract]
Current service cost	4,114	5,460
Interest cost	12,994	12,015
Pensions and Seniority Premiums [Member] | DBO [Member]
Disclosure of net defined benefit liability (asset) [abstract]
Balance at period start	153,572	144,049
Current service cost	4,114	5,460
Interest cost	12,994	12,015
Benefits paid	(165)	(296)
Benefits paid from plan assets	(8,840)	(9,272)
Miscellaneous	300	908
Actuarial losses and gains	(7,847)	708
Balance at period end	154,128	153,572
Termination of Employment [Member]
Disclosure of net defined benefit liability (asset) [abstract]
Current service cost	1,858	1,868
Interest cost	2,245	1,941
Termination of Employment [Member] | DBO [Member]
Disclosure of net defined benefit liability (asset) [abstract]
Balance at period start	24,687	21,809
Current service cost	1,858	1,868
Interest cost	2,245	1,941
Benefits paid	(214)	0
Benefits paid from plan assets	0	0
Miscellaneous	(18)	0
Actuarial losses and gains	(2,954)	(931)
Balance at period end	$ 25,604	$ 24,687

Employee benefits, Plan assets

Employee benefits, Plan assets (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Plan assets [Abstract]
Balance at period start	$ 175,560	$ 164,207
Plan contributions	(8,840)	0
Interests of plan assets	(225)	(140)
Balance at period end	176,606	175,560
Plan Assets [Member]
Plan assets [Abstract]
Balance at period start	2,699	1,651
Expected return on assets	202	908
Plan contributions	8,840	9,272
Benefits paid	(8,840)	(9,272)
Interests of plan assets	225	140
Balance at period end	$ 3,126	$ 2,699

Employee benefits, Changes in p

Employee benefits, Changes in pension plan, seniority premium and termination of employment plan (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Changes in pension plan [Abstract]
Balance at period start	$ 175,560	$ 164,207
Cost of the period	21,211	21,284
Interest income	(225)	(140)
Contributions to the plan	(8,840)	0
Benefits paid against the reservation	(379)	(9,272)
Miscellaneous	80	(296)
Actuarial losses	(10,801)	(223)
Balance at period end	$ 176,606	$ 175,560

Employee benefits, Significant

Employee benefits, Significant actuarial assumptions (Details) $ in Thousands	Dec. 31, 2018MXN ($)Employee	Dec. 31, 2017Employee
Significant actuarial assumptions [Abstract]
Percentage of employees working under collective bargaining agreements	17.00%	17.00%
Number of employees | Employee	1,676	1,494
Discount Rate [Member]
Significant actuarial assumptions [Abstract]
Significant actuarial assumptions used for valuation	9.25%	9.25%
Discount Rate [Member] | 1.0% Increase [Member]
Significant actuarial assumptions [Abstract]
Increase (decrease) in defined benefit obligation	$ (5,945)
Discount Rate [Member] | 1.0% Decrease [Member]
Significant actuarial assumptions [Abstract]
Increase (decrease) in defined benefit obligation	$ 6,325
Salary Increase Rate [Member]
Significant actuarial assumptions [Abstract]
Significant actuarial assumptions used for valuation	4.00%	4.00%
Salary Increase Rate [Member] | 1.0% Increase [Member]
Significant actuarial assumptions [Abstract]
Increase (decrease) in defined benefit obligation	$ 4,466
Salary Increase Rate [Member] | 1.0% Decrease [Member]
Significant actuarial assumptions [Abstract]
Increase (decrease) in defined benefit obligation	$ (4,227)
Inflation Rate [Member]
Significant actuarial assumptions [Abstract]
Significant actuarial assumptions used for valuation	3.50%	3.50%
Average Working Life Expectancy [Member]
Significant actuarial assumptions [Abstract]
Significant actuarial assumptions used for valuation	19.30%	19.80%
Average Working Life Expectancy [Member] | One year Increase [Member]
Significant actuarial assumptions [Abstract]
Increase (decrease) in defined benefit obligation	$ 5,134
Average Working Life Expectancy [Member] | One year Decrease [Member]
Significant actuarial assumptions [Abstract]
Increase (decrease) in defined benefit obligation	$ (5,292)

Profit (loss) per share (Detail

Profit (loss) per share (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Profit (loss) per share [Abstract]
Number of potentially dilutive instruments outstanding (in shares)	0	0	0

Fair value measurement, Fair va

Fair value measurement, Fair value measures for non-financial assets (Details) - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair value measurement [Abstract]
Non-financial assets	$ 3,781,084	$ 4,124,212	$ 11,923,301
Recurring [Member] | Level 3 [Member]
Fair value measurement [Abstract]
Non-financial assets	2,167,826	2,544,881
Recurring [Member] | Vessels [Member] | Level 3 [Member]
Fair value measurement [Abstract]
Non-financial assets	782,673	1,118,250	$ 8,028,276
Recurring [Member] | Buildings and Facilities [Member] | Level 3 [Member]
Fair value measurement [Abstract]
Non-financial assets	238,901	242,204
Recurring [Member] | Land [Member] | Level 3 [Member]
Fair value measurement [Abstract]
Non-financial assets	$ 1,146,252	$ 1,184,427

Fair value measurement, Informa

Fair value measurement, Information used for appraisal (Details) - Recurring [Member] - Discounted Cash Flow [Member]	12 Months Ended
	Dec. 31, 2018USD ($)
Tugboats [Member]
Information used for appraisal [Abstract]
Daily rate or fee	$ 5,897
Average percentage of utilization	96.00%
Discount rate	7.65%
Offshore Vessels [Member]
Information used for appraisal [Abstract]
Daily rate or fee	$ 4,903
Average percentage of utilization	62.00%
Discount rate	7.18%
Parcel Tankers [Member]
Information used for appraisal [Abstract]
Daily rate or fee	$ 12,591
Average percentage of utilization	94.00%
Discount rate	7.18%

Fair value measurement, Reconci

Fair value measurement, Reconciliation of non-financial assets classified within Level 3 (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation between the carrying amounts of non-financial assets [Abstract]
Beginning balance	$ 4,124,212	$ 11,923,301
Amount recognized in statements of operations [Abstract]
Ending balance	3,781,084	4,124,212
Recurring [Member] | Level 3 [Member]
Reconciliation between the carrying amounts of non-financial assets [Abstract]
Beginning balance	2,544,881
Amount recognized in statements of operations [Abstract]
Ending balance	2,167,826	2,544,881
Effects from unrealized gains from fair value measurements	0	0
Recurring [Member] | Vessels [Member] | Level 3 [Member]
Reconciliation between the carrying amounts of non-financial assets [Abstract]
Beginning balance	1,118,250	8,028,276
Amount recognized in other comprehensive income [Abstract]
Revaluation surplus of vessels	(161,411)	941,957
Amount recognized in statements of operations [Abstract]
Loss on revaluation of vessels	0	(56,213)
Total gains (losses) recognized in other comprehensive income and in statements of operations	(161,411)	885,744
Additions and disposals, net	(174,166)	(7,795,770)
Ending balance	782,673	1,118,250
Recurring [Member] | Buildings and Facilities [Member] | Level 3 [Member]
Reconciliation between the carrying amounts of non-financial assets [Abstract]
Beginning balance	1,426,631	1,314,057
Amount recognized in other comprehensive income [Abstract]
Revaluation surplus of vessels	0	0
Amount recognized in statements of operations [Abstract]
Loss on revaluation of vessels	0	0
Total gains (losses) recognized in other comprehensive income and in statements of operations	0	0
Additions and disposals, net	(41,478)	112,574
Ending balance	$ 1,385,153	$ 1,426,631

Financial instruments risk, Cur

Financial instruments risk, Currency risk (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018MXN ($)$ / $	Dec. 31, 2017MXN ($)$ / $	Apr. 29, 2018$ / $
Currency Risk [Member]
Currency risk [Abstract]
Percentage of sales denominated in US dollars	45.00%	75.00%
Percentage of costs and expenses denominated in US dollars	25.00%	25.00%
Foreign exchange rate | $ / $	19.6566	19.7354	19.0942
Currency Risk [Member] | Minimum [Member]
Currency risk [Abstract]
Assumed variance on foreign exchange rate	(0.04%)	(4.73%)
Currency Risk [Member] | Maximum [Member]
Currency risk [Abstract]
Assumed variance on foreign exchange rate	0.04%	4.73%
Currency Risk [Member] | US [Member]
Currency risk [Abstract]
Assets	$ 484,443	$ 548,919
Liabilities	(637,953)	(828,367)
Total assets (liabilities)	(153,510)	(279,448)
Currency Risk [Member] | Other Currencies [Member]
Currency risk [Abstract]
Assets	1,108	1,120
Liabilities	(103,096)	(134,547)
Total assets (liabilities)	(101,988)	(133,427)
0.04% Increase in the Exchange Rate [Member]
Currency risk [Abstract]
Total assets (liabilities)	(82)
0.04% Increase in the Exchange Rate [Member] | US [Member]
Currency risk [Abstract]
Assets	155
Liabilities	(33)
0.04% Increase in the Exchange Rate [Member] | Other Currencies [Member]
Currency risk [Abstract]
Assets	(204)
Liabilities	0
0.04% Decrease in the Exchange Rate [Member]
Currency risk [Abstract]
Total assets (liabilities)	82
0.04% Decrease in the Exchange Rate [Member] | US [Member]
Currency risk [Abstract]
Assets	(155)
Liabilities	33
0.04% Decrease in the Exchange Rate [Member] | Other Currencies [Member]
Currency risk [Abstract]
Assets	204
Liabilities	$ 0
4.73% Increase in the Exchange Rate [Member]
Currency risk [Abstract]
Total assets (liabilities)		(19,547)
4.73% Increase in the Exchange Rate [Member] | US [Member]
Currency risk [Abstract]
Assets		25,989
Liabilities		(39,219)
4.73% Increase in the Exchange Rate [Member] | Other Currencies [Member]
Currency risk [Abstract]
Assets		53
Liabilities		(6,370)
4.73% Decrease in the Exchange Rate [Member]
Currency risk [Abstract]
Total assets (liabilities)		19,547
4.73% Decrease in the Exchange Rate [Member] | US [Member]
Currency risk [Abstract]
Assets		(25,989)
Liabilities		39,219
4.73% Decrease in the Exchange Rate [Member] | Other Currencies [Member]
Currency risk [Abstract]
Assets		(53)
Liabilities		$ 6,370

Financial instruments risk, Int

Financial instruments risk, Interest rate risks (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest rate risks [Abstract]
Profit or loss for the year	$ 23,549	$ 1,329,579	$ (506,564)
Interest Rate Risks [Member] | Fixed Rate [Member]
Interest rate risks [Abstract]
Debt	288,000	319,600
Interest Rate Risks [Member] | Variable Rate [Member]
Interest rate risks [Abstract]
Debt	327,400	578,300
1% Variance [Member]
Interest rate risks [Abstract]
Profit or loss for the year	(1,439)	(2,048)
- 1% Variance [Member]
Interest rate risks [Abstract]
Profit or loss for the year	$ 1,439	$ 2,048

Financial instruments risk, Cre

Financial instruments risk, Credit risk and Concentration of risk (Details) - Credit Risk [Member]	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Credit risk [Abstract]
Average payment period of significant client	180 days
TMM DM [Member]
Concentration of risk [Abstract]
Percentage of revenue	17.00%
Grupo Celanese [Member]
Concentration of risk [Abstract]
Percentage of revenue	10.00%
Helmsley Management [Member]
Concentration of risk [Abstract]
Percentage of revenue	9.00%
Pemex Exploracion y Produccion [Member]
Concentration of risk [Abstract]
Percentage of revenue		16.00%
P.M.I Trading Limited [Member]
Concentration of risk [Abstract]
Percentage of revenue		13.00%
Fieldwood Energy E&P Mexico [Member]
Concentration of risk [Abstract]
Percentage of revenue		13.00%
Remaining Customers [Member] | Maximum [Member]
Concentration of risk [Abstract]
Percentage of revenue	4.00%	5.00%

Financial instruments risk, Exp

Financial instruments risk, Expected Credit Loss for Trade Accounts Receivable (Details) - Trade Receivables [Member] - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Expected credit loss for trade accounts receivable [Abstract]
Expected credit loss rate	0.00%	0.00%
Gross Carrying Value [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 248,183	$ 250,637
Expected Credit Losses During Life [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 22,303	$ 28,310
Current [Member]
Expected credit loss for trade accounts receivable [Abstract]
Expected credit loss rate	0.00%	0.00%
Current [Member] | Gross Carrying Value [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 143,566	$ 192,971
Current [Member] | Expected Credit Losses During Life [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 0	$ 0
More Than 30 Days [ Member]
Expected credit loss for trade accounts receivable [Abstract]
Expected credit loss rate	0.00%	0.00%
More Than 30 Days [ Member] | Gross Carrying Value [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 15,935	$ 23,146
More Than 30 Days [ Member] | Expected Credit Losses During Life [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 0	$ 0
More Than 60 Days [Member]
Expected credit loss for trade accounts receivable [Abstract]
Expected credit loss rate	5.00%	10.30%
More Than 60 Days [Member] | Gross Carrying Value [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 12,905	$ 3,569
More Than 60 Days [Member] | Expected Credit Losses During Life [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 645	$ 368
More Than 90 Days [Member]
Expected credit loss for trade accounts receivable [Abstract]
Expected credit loss rate	28.60%	90.30%
More Than 90 Days [Member] | Gross Carrying Value [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 75,777	$ 30,951
More Than 90 Days [Member] | Expected Credit Losses During Life [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 21,658	$ 27,942

Financial instruments risk, Liq

Financial instruments risk, Liquidity risk and Dissolution of Company risk (Details) - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Liquidity risk [Abstract]
Trade payables	$ 262,090	$ 169,072
Accounts payable and accrued expenses	357,523	341,918
Financial debt	$ 615,425	$ 898,618
Liquidity Risk [Member]
Liquidity risk [Abstract]
Percentage of financial liabilities due in next 12 months	36.00%	56.00%
Liquidity Risk [Member] | In 6 Months [Member]
Liquidity risk [Abstract]
Trade payables	$ 0	$ 0
Accounts payable and accrued expenses	0	0
Financial debt	83,185	333,814
Financial liabilities	83,185	333,814
Liquidity Risk [Member] | 6 to 12 Months [Member]
Liquidity risk [Abstract]
Trade payables	240,090	169,072
Accounts payable and accrued expenses	357,523	366,918
Financial debt	140,177	168,547
Financial liabilities	737,790	704,537
Liquidity Risk [Member] | 1 to 4 Years [Member]
Liquidity risk [Abstract]
Financial debt	392,063	396,257
Financial liabilities	392,063	396,257
Liquidity Risk [Member] | More than 4 Years [Member]
Liquidity risk [Abstract]
Financial debt	0	0
Financial liabilities	$ 0	$ 0

Capital management policies a_3

Capital management policies and procedures (Details) $ in Thousands	Dec. 31, 2018MXN ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Capital management policies and procedures [Abstract]
Stockholders' equity	$ 2,124,258	$ 2,229,062	$ 963,990	$ 431,806
Total financial debt	615,425	898,618
Cash and cash equivalents	(318,155)	(461,554)
General financing	$ 297,270	$ 437,064
Ratio of total debt to stockholders' equity	0.14	0.20

Commitments and contingencies,

Commitments and contingencies, Commitments (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Commitments [Abstract]
Concession fees	$ 18,924	$ 17,589

Commitments and contingencies_2

Commitments and contingencies, Contingencies (Details)	Apr. 12, 2018USD ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2018USD ($)	Aug. 12, 2016MXN ($)	Dec. 31, 2007MXN ($)	Dec. 31, 2007USD ($)	Oct. 19, 2007MXN ($)	Oct. 19, 2007USD ($)	Aug. 07, 2007MXN ($)	Aug. 07, 2007USD ($)
Contingencies [Abstract]
Contingent liability				$ 2,400,000
RPS Claim [Member]
Contingencies [Abstract]
Contingent asset										$ 982,830	$ 50,000
Contingent liability								$ 58,970,000	$ 3,000,000
Mutual Loans Between WWS and TMM [Member]
Contingencies [Abstract]
Contingent asset						$ 7,739,000	$ 393,731
Contingent liability						$ 18,438,000	$ 938,000
ADEMSA Secured Certificates of Deposit [Member]
Contingencies [Abstract]
Settlement reserve		$ 2,461,000	$ 2,461,000
Settlement payment		$ 2,893,000	$ 3,993,000
Claim of Grupo TMM Against SSA Mexico, S.A. de C.V. (SSA) [Member]
Contingencies [Abstract]
Contingent liability					$ 119,673,000
Proceeds from arbitration	$ 335,150,000
Arbitration expenses	$ 29,580,000

Events subsequent to the repo_2

Events subsequent to the reporting date (Details) - Optimus [Member] - Subsequent Events [Member]	Feb. 14, 2019
Events subsequent to the reporting date [Abstract]
Percentage of remaining capital stock acquired	50.00%
Percentage of ownership	100.00%