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Basis of presentation - Summary of Reconciliation Of Changes In Cash Flow Statement (Detail) - EUR (€) € in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Reconciliation Of Changes In Cash Flow Statement [Line Items] |  |  |  |  |  |
(Increase) decrease in other assets | € (373) | € (1,106) | € (1,600) | € (1,497) | [1] | € 5,608
Net cash provided by/ (used in) operating activities | (11,450) | (27,739) | (85,610) | 70,967 | [1] | 20,684
Cash paid for investments in Other financial assets | (32,859) | (32,859) | (82,930) | (20,473) | [1] | (13,101)
Cash received from maturity of investments classified in Other financial assets | 16,023 | 48,882 | 74,505 | 17,551 | [1] |
Net cash provided by/ (used in) investing activities | (19,223) | 11,473 | (15,949) | (5,059) | [1] | (13,514)
Previously stated [member] |  |  |  |  |  |
Disclosure Of Reconciliation Of Changes In Cash Flow Statement [Line Items] |  |  |  |  |  |
(Increase) decrease in other assets | (17,209) | 14,917 |  | (4,419) |  | (7,493)
Net cash provided by/ (used in) operating activities | (28,286) | (11,716) | (85,610) | 68,045 |  | 7,583
Net cash provided by/ (used in) investing activities | (2,387) | (4,550) | € (15,949) | (2,137) |  | (413)
Increase (decrease) due to changes in accounting policy and corrections of prior period errors [member] |  |  |  |  |  |
Disclosure Of Reconciliation Of Changes In Cash Flow Statement [Line Items] |  |  |  |  |  |
(Increase) decrease in other assets | 16,836 | (16,023) |  | 2,922 |  | 13,101
Net cash provided by/ (used in) operating activities | 16,836 | (16,023) |  | 2,922 |  | 13,101
Cash paid for investments in Other financial assets | (32,859) | (32,859) |  | (20,473) |  | (13,101)
Cash received from maturity of investments classified in Other financial assets | 16,023 | 48,882 |  | 17,551 |  |
Net cash provided by/ (used in) investing activities | € (16,836) | € 16,023 |  | € (2,922) |  | € (13,101)
[1] | See Note 2 for details regarding the revision as a result of a correction in classification of Other financial assets

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- Definition The cash flows from (used in) investing activities, which are the acquisition and disposal of long-term assets and other investments not included in cash equivalents. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_10&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_50_d&doctype=Standard -URIDate 2020-01-01 + Details
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