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Presentation of Financial Statements and Summary of Significant Accounting Policies - Summary of Impacts of Adoption - Statements of Cash Flows (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities |  |  |
Net income for the year | R$ 1,132,320 | R$ 1,525,865 | R$ 1,546,816
Adjustments to reconcile net income to cash provided by operating activities |  |  |
Share of loss (profit) of joint ventures and associates | 14,779 | (20,673) | (7,476)
Amortization of contractual assets with customers - exclusive rights | 371,825 | 463,049 | 463,490
Depreciation and amortization | 812,489 | 704,544 | 628,156
PIS and COFINS credits on depreciation | 15,721 | 13,134 | 12,581
Interest, monetary, and foreign exchange rate variations | 1,026,515 | 854,671 | 763,793
Deferred income and social contribution taxes | 162,417 | (109,204) | (112,539)
(Gain) loss on disposal of property, plant and equipment and intangibles | 22,088 | 2,242 | 6,134
Estimated credit losses on doubtful accounts | 69,250 | 132,756 | 79,983
Provision for losses in inventories | (1,498) | (802) | 555
Provision for post-employment benefits | 4,854 | 13,968 | 7,631
Other provisions and adjustments | (135) | 1,539 | (903)
Adjustments, total | 3,630,625 | 3,581,089 | 3,388,221
(Increase) decrease in current assets |  |  |
Trade receivables and reseller financing | (355,854) | (725,240) | (372,881)
Inventories | 168,704 | (606,484) | (267,519)
Increase (decrease) in current liabilities |  |  |
Taxes payable | 46,476 | 33,054 | 4,021
Increase (decrease) in non-current liabilities |  |  |
Post-employment benefits | (8,457) | (759) | (7,671)
Payments of contractual assets with customers - exclusive rights | (390,177) | (529,732) | (514,291)
Income and social contribution taxes paid | (197,886) | (836,808) | (644,188)
Net cash provided by operating activities | 2,888,959 | 1,739,038 | 1,988,881
Cash flows from investing activities |  |  |
Acquisition of property, plant, and equipment | (1,178,312) | (1,302,187) | (1,033,937)
Acquisition of intangible assets | (237,593) | (221,960) | (107,644)
Other investing activities items | (1,669,937) | 60,859 | (163,625)
Net cash used in investing activities | (3,177,633) | (1,371,755) | (1,323,987)
Net cash provided by financing activities | (801,007) | 340,349 | 928,388
Effect of exchange rate changes on cash and cash equivalents in foreign currency | 26,628 | 20,214 | (22,017)
Increase in cash and cash equivalents | (1,063,053) | 727,846 | 1,571,265
Cash and cash equivalents at the beginning of the year | 5,002,004 | 4,274,158 | 2,702,893
Cash and cash equivalents at the end of the year | 3,938,951 | 5,002,004 | 4,274,158
Previously stated [member] |  |  |
Cash flows from operating activities |  |  |
Net income for the year |  | 1,573,868 | 1,570,618
Adjustments to reconcile net income to cash provided by operating activities |  |  |
Share of loss (profit) of joint ventures and associates |  | (20,673) | (7,476)
Depreciation and amortization |  | 1,175,951 | 1,103,538
PIS and COFINS credits on depreciation |  | 13,134 | 12,581
Asset retirement obligation |  | (15,432) | (2,785)
Interest, monetary, and foreign exchange rate variations |  | 854,671 | 763,793
Deferred income and social contribution taxes |  | (83,029) | (100,505)
(Gain) loss on disposal of property, plant and equipment and intangibles |  | 2,242 | 6,134
Other provisions and adjustments |  | (868) | (6,515)
Adjustments, total |  | 3,499,864 | 3,339,383
(Increase) decrease in current assets |  |  |
Trade receivables and reseller financing |  | (665,145) | (326,695)
Inventories |  | (605,757) | (262,993)
Other current asset items |  | 30,860 | (254,774)
Increase (decrease) in current liabilities |  |  |
Taxes payable |  | 34,707 | 2,229
Insurance and other payables |  | (33,955) | 56,811
Other current liabilities items |  | 1,216,294 | 791,257
(Increase) decrease in non-current assets |  |  |
Other non-current asset items |  | (393,991) | (211,967)
Increase (decrease) in non-current liabilities |  |  |
Post-employment benefits |  | 13,209 | (40)
Other non-current liabilities items |  | 20,142 | 24,647
Income and social contribution taxes paid |  | (836,808) | (644,188)
Net cash provided by operating activities |  | 2,279,420 | 2,513,670
Cash flows from investing activities |  |  |
Acquisition of property, plant, and equipment |  | (1,262,558) | (1,015,199)
Acquisition of intangible assets |  | (801,971) | (651,171)
Other investing activities items |  | 152,392 | (182,406)
Net cash used in investing activities |  | (1,912,137) | (1,848,776)
Net cash provided by financing activities |  | 340,349 | 928,388
Effect of exchange rate changes on cash and cash equivalents in foreign currency |  | 20,214 | (22,017)
Increase in cash and cash equivalents |  | 727,846 | 1,571,265
Cash and cash equivalents at the beginning of the year | 5,002,004 | 4,274,158 | 2,702,893
Cash and cash equivalents at the end of the year |  | 5,002,004 | 4,274,158
After adoption IFRS 9 and 15 [member] |  |  |
Cash flows from operating activities |  |  |
Net income for the year |  | 1,525,865 | 1,546,816
Adjustments to reconcile net income to cash provided by operating activities |  |  |
Share of loss (profit) of joint ventures and associates |  | (20,673) | (7,476)
Amortization of contractual assets with customers - exclusive rights |  | 463,049 | 463,490
Depreciation and amortization |  | 704,544 | 628,156
PIS and COFINS credits on depreciation |  | 13,134 | 12,581
Interest, monetary, and foreign exchange rate variations |  | 854,671 | 763,793
Deferred income and social contribution taxes |  | (109,204) | (112,539)
(Gain) loss on disposal of property, plant and equipment and intangibles |  | 2,242 | 6,134
Estimated credit losses on doubtful accounts |  | 132,756 | 79,983
Provision for losses in inventories |  | (802) | 555
Provision for post-employment benefits |  | 13,968 | 7,631
Other provisions and adjustments |  | 1,539 | (903)
Adjustments, total |  | 3,581,089 | 3,388,221
(Increase) decrease in current assets |  |  |
Trade receivables and reseller financing |  | (725,240) | (372,881)
Inventories |  | (606,484) | (267,519)
Other current asset items |  | 30,860 | (254,774)
Increase (decrease) in current liabilities |  |  |
Taxes payable |  | 33,054 | 4,021
Insurance and other payables |  | (49,387) | 54,026
Other current liabilities items |  | 1,216,294 | 791,257
(Increase) decrease in non-current assets |  |  |
Other non-current asset items |  | (393,991) | (211,967)
Increase (decrease) in non-current liabilities |  |  |
Post-employment benefits |  | (759) | (7,671)
Other non-current liabilities items |  | 20,142 | 24,647
Payments of contractual assets with customers - exclusive rights |  | (529,732) | (514,291)
Income and social contribution taxes paid |  | (836,808) | (644,188)
Net cash provided by operating activities |  | 1,739,038 | 1,988,881
Cash flows from investing activities |  |  |
Acquisition of property, plant, and equipment |  | (1,302,187) | (1,033,937)
Acquisition of intangible assets |  | (221,960) | (107,644)
Other investing activities items |  | 152,392 | (182,406)
Net cash used in investing activities |  | (1,371,755) | (1,323,987)
Net cash provided by financing activities |  | 340,349 | 928,388
Effect of exchange rate changes on cash and cash equivalents in foreign currency |  | 20,214 | (22,017)
Increase in cash and cash equivalents |  | 727,846 | 1,571,265
Cash and cash equivalents at the beginning of the year | R$ 5,002,004 | 4,274,158 | 2,702,893
Cash and cash equivalents at the end of the year |  | 5,002,004 | 4,274,158
Effect of overlay approach reclassification [member] |  |  |
Adjustments to reconcile net income to cash provided by operating activities |  |  |
Asset retirement obligation |  | 15,432 | 2,785
Estimated credit losses on doubtful accounts |  | 132,756 | 79,983
Provision for losses in inventories |  | (802) | 555
Provision for post-employment benefits |  | 13,968 | 7,631
Adjustments, total |  | 161,354 | 90,954
(Increase) decrease in current assets |  |  |
Trade receivables and reseller financing |  | (129,574) | (86,145)
Inventories |  | (727) | (4,526)
Increase (decrease) in current liabilities |  |  |
Taxes payable |  | (1,653) | 1,792
Insurance and other payables |  | (15,432) | (2,785)
Increase (decrease) in non-current liabilities |  |  |
Post-employment benefits |  | (13,968) | (7,631)
Cash flows from investing activities |  |  |
Acquisition of property, plant, and equipment |  | (39,629) | (18,738)
Acquisition of intangible assets |  | 39,629 | 18,738
IFRS9 [member] | Increase (decrease) due to changes in accounting policy [member] |  |  |
Cash flows from operating activities |  |  |
Net income for the year |  | (46,886) | (29,239)
Adjustments to reconcile net income to cash provided by operating activities |  |  |
Deferred income and social contribution taxes |  | (25,599) | (14,835)
Adjustments, total |  | (72,485) | (44,074)
(Increase) decrease in current assets |  |  |
Trade receivables and reseller financing |  | 72,485 | 44,074
IFRS 15 [member] | Increase (decrease) due to changes in accounting policy [member] |  |  |
Cash flows from operating activities |  |  |
Net income for the year |  | (1,117) | 5,437
Adjustments to reconcile net income to cash provided by operating activities |  |  |
Amortization of contractual assets with customers - exclusive rights |  | 463,049 | 463,490
Depreciation and amortization |  | (471,407) | (475,382)
Deferred income and social contribution taxes |  | (576) | 2,801
Other provisions and adjustments |  | 2,407 | 5,612
Adjustments, total |  | (7,644) | 1,958
(Increase) decrease in current assets |  |  |
Trade receivables and reseller financing |  | (3,006) | (4,115)
Increase (decrease) in non-current liabilities |  |  |
Payments of contractual assets with customers - exclusive rights |  | (529,732) | (514,291)
Net cash provided by operating activities |  | (540,382) | (524,789)
Cash flows from investing activities |  |  |
Acquisition of intangible assets |  | 540,382 | 524,789
Net cash used in investing activities |  | R$ 540,382 | R$ 524,789

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