XML 240 R226.htm IDEA: XBRL DOCUMENT v3.8.0.1
Summary of significant differences between accounting principles followed by the Company and U.S. Generally Accepted Accounting Principles (Details textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Summary of significant differences between accounting principles followed by the Company and U.S. Generally Accepted Accounting Principles [Line Items]      
Impairment loss $ 21,620 $ 0 $ 3,803
Deferred Tax Asset, Valuation Allowance     $ 321,600
Yanacocha mine [Member]      
Disclosure of Summary of significant differences between accounting principles followed by the Company and U.S. Generally Accepted Accounting Principles [Line Items]      
Impairment loss   889,000  
Yanacocha mine [Member] | US GAAP [Member]      
Disclosure of Summary of significant differences between accounting principles followed by the Company and U.S. Generally Accepted Accounting Principles [Line Items]      
Impairment loss   $ 933,000