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Improvements to Concession Assets - Summary of Improvements to Concession Assets (Detail) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about service concession arrangements [Line Items] |  |  |
Beginning balance | $ 12,063,383 | $ 10,982,860 | $ 9,944,022
Additions | 1,535,460 | 1,194,803 | 1,033,311
Divestitures |  |  | (402)
Currency translation effect | 164,997 | (114,280) | 5,929
Ending balance | 13,763,840 | 12,063,383 | 10,982,860
Construction in-progress [Member] |  |  |
Disclosure of detailed information about service concession arrangements [Line Items] |  |  |
Beginning balance | 782,005 | 2,382,118 | 2,376,483
Additions | 2,153,038 | 1,218,757 | 1,661,060
Transfers | (259,621) | (2,804,400) | (1,669,128)
Currency translation effect | 9,207 | (14,470) | 13,703
Ending balance | 2,684,629 | 782,005 | 2,382,118
Improvements to concession assets [Member] |  |  |
Disclosure of detailed information about service concession arrangements [Line Items] |  |  |
Beginning balance | 16,843,096 | 13,441,649 | 11,779,768
Additions | 321,758 | 760,726 | 6,366
Divestitures |  | (21,977) | (7,919)
Transfers | 259,621 | 2,804,400 | 1,669,128
Currency translation effect | 202,739 | (141,702) | (5,694)
Ending balance | 17,627,214 | 16,843,096 | 13,441,649
Total investment [Member] |  |  |
Disclosure of detailed information about service concession arrangements [Line Items] |  |  |
Beginning balance | 17,625,101 | 15,823,767 | 14,156,251
Additions | 2,474,796 | 1,979,483 | 1,667,426
Divestitures |  | (21,977) | (7,919)
Currency translation effect | 211,946 | (156,172) | 8,009
Ending balance | 20,311,843 | 17,625,101 | 15,823,767
Accumulated amortization [Member] |  |  |
Disclosure of detailed information about service concession arrangements [Line Items] |  |  |
Beginning balance | (5,561,718) | (4,840,907) | (4,212,229)
Additions | (939,336) | (784,680) | (634,115)
Divestitures |  | 21,977 | 7,517
Currency translation effect | (46,949) | 41,892 | (2,080)
Ending balance | $ (6,548,003) | $ (5,561,718) | $ (4,840,907)

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- Definition The amount of additions to investment property other than those acquired through business combinations. [Refer: Business combinations [member]; Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2020-01-01 -Paragraph 76 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2020-en-r&anchor=para_76_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2020-01-01 -Paragraph 79 -Subparagraph d -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2020-en-r&anchor=para_79_d_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease in investment property resulting from disposals. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2020-01-01 -Paragraph 76 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2020-en-r&anchor=para_76_c&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2020-01-01 -Paragraph 79 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2020-en-r&anchor=para_79_d_iii&doctype=Standard -URIDate 2020-01-01 + Details
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