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Impairment of Investment in Equity Investees (Parenthetical) (Detail) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Impairment Of Assets [Line Items] |  |  |  |  |
Total impairment of investment in equity investees |  |  | $ 109.5 |  | $ 7.4
Hummingbird |  |  |  |  |
Impairment Of Assets [Line Items] |  |  |  |  |
Total impairment of investment in equity investees |  | $ 7.5 | 7.5 | [1] |
Far South East Project [Member] |  |  |  |  |
Impairment Of Assets [Line Items] |  |  |  |  |
Total impairment of investment in equity investees | $ 101.4 |  | $ 101.4 | [2] |
Equity method investment ownership percentage | 40.00% |  | 40.00% |  | 40.00%
Far South East Project [Member] | Lepanto Consolidated Mining Company |  |  |  |  |
Impairment Of Assets [Line Items] |  |  |  |  |
Equity method investment ownership percentage | 60.00% |  | 60.00% |  |
[1] | Following the identification of impairment indicators at June 30, 2015, the carrying amount of the investment in Hummingbird was impaired to its fair value, being its quoted market price, which resulted in an impairment of $7.5 million.
[2] | Following the identification of impairment indicators at December 31, 2015, the carrying value of FSE was impaired to its fair value which resulted in an impairment of $101.4 million. The fair value was indirectly derived from the market value of Lepanto Consolidated Mining Company, being the 60% shareholder of FSE.

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=49116238&loc=d3e32787-111569 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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