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Segment information (Details 1) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Segment assets S/ 2,792,420 S/ 2,911,643 S/ 3,288,588
Other assets 21,695 70,569 125,206
Assets held for distribution 338,411  
Total assets 2,814,115 3,320,623 3,413,794
Operating liabilities 1,307,407 1,337,890 1,367,660
Liabilities held for distribution 2,704  
Total liabilities 1,307,407 1,340,594 1,367,660
Capital expenditure 69,732 117,801 490,807
Depreciation and amortization (124,206) (111,266) (70,810)
Provision of inventory net realizable value and obsolescence (2,718) (3,493) (8,909)
Cement, concrete and blocks [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Segment assets 2,607,334 2,678,871 2,743,007
Other assets 489 69,912 124,770
Assets held for distribution
Total assets 2,607,823 2,748,783 2,867,777
Operating liabilities 1,274,322 1,316,144 1,326,650
Liabilities held for distribution
Total liabilities 1,274,322 1,316,144 1,326,650
Capital expenditure 69,717 101,729 454,275
Depreciation and amortization (119,518) (102,900) (67,221)
Provision of inventory net realizable value and obsolescence (2,718) (1,499) 426
Construction supplies [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Segment assets 30,791 27,652 27,719
Other assets
Assets held for distribution
Total assets 30,791 27,652 27,719
Operating liabilities 31,966 20,760 30,182
Liabilities held for distribution
Total liabilities 31,966 20,760 30,182
Capital expenditure    
Depreciation and amortization    
Provision of inventory net realizable value and obsolescence    
Quicklime [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Segment assets 118,712 122,446 125,584
Other assets
Assets held for distribution
Total assets 118,712 122,446 125,584
Operating liabilities
Liabilities held for distribution
Total liabilities
Capital expenditure  
Depreciation and amortization (4,504) (4,377) (2,264)
Provision of inventory net realizable value and obsolescence
Other [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Segment assets 35,583 82,674 392,278
Other assets 21,206 657 436
Assets held for distribution 338,411
Total assets 56,789 421,742 392,714
Operating liabilities 1,119 986 10,828
Liabilities held for distribution 2,704
Total liabilities 1,119 3,690 10,828
Capital expenditure 15 16,072 36,532
Depreciation and amortization (184) (3,989) (1,325)
Provision of inventory net realizable value and obsolescence S/ (9,335)