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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)

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