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Business combinations (Details 1) (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Book value of purchased entities    
The assets and liabilities arising from the acquisition    
Cash and cash equivalents R$ 1,996 R$ 51
Liquid working capital, Assets acquired 130 2,598
Liabilities assumed (3,975) (1,312)
Property, plant and equipment and intangible assets 2,284 643
Value of net assets 435 1,980
Goodwill 19,175 26,184
Bargain purchase gain   (87)
Purchase cost 19,610 28,077
Purchase accounting adjustment    
The assets and liabilities arising from the acquisition    
Property, plant and equipment and intangible assets   2,498
Value of net assets   2,498
Goodwill   (2,498)
Fair value of assets and liabilities acquired    
The assets and liabilities arising from the acquisition    
Cash and cash equivalents 1,996 51
Liquid working capital, Assets acquired 130 2,598
Liabilities assumed (3,975) (1,312)
Property, plant and equipment and intangible assets 2,284 3,141
Value of net assets 435 4,478
Goodwill 19,175 23,686
Bargain purchase gain   (87)
Purchase cost 19,610 28,077
Consideration for the purchase settled in cash 3,810 22,276
Cash and cash equivalents at the subsidiary acquired (1,996) (51)
Amount paid on acquisitions less cash and cash equivalents acquired R$ 1,813 R$ 22,225