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