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Hedge accounting - Summary of detailed information about hedging instruments (Detail)
pure in Thousands, R$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
BRL (R$)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
BRL (R$)
Disclosure of detailed information about hedging instruments [line items]        
Hedged item, Book value of assets R$ 228,563 R$ 186,412 R$ 147,179 R$ 100,323
Hedged item, Book value of liabilities 0 0 0 0
Hedged item, Variation in value recognized in Other comprehensive income R$ 52,428 R$ 5,946 R$ 18,645 R$ 2,034
Hedge instrument, Nominal amount 385,484 248,896 225,901 145,552
Hedge instrument, Variation in the amounts used to calculate hedge ineffectiveness R$ (56,496) R$ (7,133) R$ (17,495) R$ (2,386)
Hedge of net investment in foreign operations [member]        
Disclosure of detailed information about hedging instruments [line items]        
Hedged item, Book value of assets 228,563 186,412 147,179 100,323
Hedged item, Book value of liabilities 0 0 0 0
Hedged item, Variation in value recognized in Other comprehensive income R$ 52,428 R$ 5,946 R$ 18,645 R$ 2,034
Hedge instrument, Nominal amount 385,484 248,896 225,901 145,552
Hedge instrument, Variation in the amounts used to calculate hedge ineffectiveness R$ (56,496) R$ (7,133) R$ (17,495) R$ (2,386)