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Equity - Balance of Other Comprehensive Income (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total [member]
Disclosure of classes of share capital [line items]
Beginning balance	R$ (464,990)	R$ (146,317)	R$ (63,989)
Changes in fair value of financial instruments	11,364	(477,506)	(76,001)
IRPJ and CSLL on fair value	(4,060)	164,425	23,683
Actuarial gain (loss) of post-employment benefits	49,550	(7,725)	(41,794)
IRPJ and CSLL on actuarial (gains) losses	(14,002)	2,133	11,784
Ending balance	(422,138)	(464,990)	(146,317)
Fair value of cash flow hedging instruments [member]
Disclosure of classes of share capital [line items]
Beginning balance	(609,277)	(296,132)	(243,336)
Changes in fair value of financial instruments	12,036	(477,570)	(76,479)
IRPJ and CSLL on fair value	(4,060)	164,425	23,683
Actuarial gain (loss) of post-employment benefits	0	0	0
IRPJ and CSLL on actuarial (gains) losses	0		0
Ending balance	(601,301)	(609,277)	(296,132)
Fair value of financial instruments [member]
Disclosure of classes of share capital [line items]
Beginning balance	269	205	(273)
Changes in fair value of financial instruments	(672)	64	478
IRPJ and CSLL on fair value	0	0	0
Actuarial gain (loss) of post-employment benefits	0	0	0
IRPJ and CSLL on actuarial (gains) losses	0	0	0
Ending balance	(403)	269	205
Actuarial gains (losses) of post-employment benefits [member]
Disclosure of classes of share capital [line items]
Beginning balance	(53,351)	(47,759)	(17,749)
Changes in fair value of financial instruments	0	0	0
IRPJ and CSLL on fair value	0	0	0
Actuarial gain (loss) of post-employment benefits	49,550	(7,725)	(41,794)
IRPJ and CSLL on actuarial (gains) losses	(14,002)	2,133	11,784
Ending balance	(17,803)	(53,351)	(47,759)
Non-controlling shareholders interest change [member]
Disclosure of classes of share capital [line items]
Beginning balance	197,369	197,369	197,369
Changes in fair value of financial instruments	0	0	0
IRPJ and CSLL on fair value	0	0	0
Actuarial gain (loss) of post-employment benefits	0	0	0
IRPJ and CSLL on actuarial (gains) losses	0	0	0
Ending balance	R$ 197,369	R$ 197,369	R$ 197,369

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to financial assets measured at fair value through other comprehensive income applying paragraph 4.1.2A of IFRS 9. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

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The amount of other comprehensive income, before tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

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