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Sales of goods (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue [abstract]      
Cement, concrete and blocks S/ 1,076,648 S/ 1,103,426 S/ 1,089,232
Building materials 66,442 59,888 75,565
Quicklime 80,707 75,090 64,140
Other 1,842 1,765 2,078
Stotal sales of goods S/ 1,225,639 S/ 1,240,169 S/ 1,231,015