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Consolidated statements of changes in equity - PEN (S/)
S/ in Thousands
Capital stock [Member]
Investment shares [Member]
Treasury shares [Member]
Additional paid-in capital [Member]
Legal reserve [Member]
Unrealized gain (loss) on available-for-sale investments [Member]
Unrealized gain on cash flow hedge [Member]
Retained earnings [Member]
Total [Member]
Non-controlling interests [Member]
Total
Balances beginning at Dec. 31, 2014 S/ 531,461 S/ 50,503   S/ 553,791 S/ 154,905 S/ 218 S/ 4,926 S/ 696,736 S/ 1,992,540 S/ 78,145 S/ 2,070,685
Changes in Equity                      
Profit for the year               215,532 215,532 (3,865) 211,667
Other comprehensive income (loss)           (229) 6,734   6,505   6,505
Total comprehensive income           (229) 6,734 215,532 222,037 (3,865) 218,172
Appropriation of legal reserve, note 16(e)         21,553     (21,553)      
Contribution of non-controlling interests, note 16(h)                   28,475 28,475
Acquisition of treasury shares, note 16(c)     S/ (108,248)           (108,248)   (108,248)
Dividends, note 16(g)               (162,950) (162,950)   (162,950)
Other adjustments of non-controlling interests, note 16(h)       (325)         (325) 325  
Balance at end at Dec. 31, 2015 531,461 50,503 (108,248) 553,466 176,458 (11) 11,660 727,765 1,943,054 103,080 2,046,134
Changes in Equity                      
Profit for the year               116,174 116,174 (3,280) 112,894
Other comprehensive income (loss)           156 (28,407)   (28,251)   (28,251)
Total comprehensive income           156 (28,407) 116,174 87,923 (3,280) 84,643
Appropriation of legal reserve, note 16(e)         11,617     (11,617)      
Contribution of non-controlling interests, note 16(h)                   4,488 4,488
Dividends, note 16(g)               (155,236) (155,236)   (155,236)
Other adjustments of non-controlling interests, note 16(h)       (8,301)         (8,301) 8,301  
Balance at end at Dec. 31, 2016 531,461 50,503 (108,248) 545,165 188,075 145 (16,747) 677,086 1,867,440 112,589 1,980,029
Changes in Equity                      
Profit for the year               93,782 93,782 (13,151) 80,631
Other comprehensive income (loss)           (145) (26,952)   (27,097)   (27,097)
Total comprehensive income           S/ (145) (26,952) 93,782 66,685 (13,151) 53,534
Appropriation of legal reserve, note 16(e)         9,379     (9,379)      
Contribution of non-controlling interests, note 16(h)                   491 491
Acquisition of treasury shares, note 16(c)     (34,216)           (34,216)   (34,216)
Splitting effects of equity block, note 1.1 (107,593) (10,224) 23,459 (118,569) (36,957)       (249,884) (100,357) (350,241)
Dividends, note 16(g)               (149,837) (149,837)   (149,837)
Terminated dividends, note 16(g)         189       189   189
Impairment on brine project, note 1.2       6,759         6,759   6,759
Other adjustments of non-controlling interests, note 16(h)       (576)         (576) 576  
Balance at end at Dec. 31, 2017 S/ 423,868 S/ 40,279 S/ (119,005) S/ 432,779 S/ 160,686   S/ (43,699) S/ 611,652 S/ 1,506,560 S/ 148 S/ 1,506,708