Acquisition of Joaquin Mineral Interests (Parenthetical) (Detail) (USD $)	Dec. 21, 2012
Business Combinations [Abstract]
Number of shares issued for acquisition (in shares)	1,310,043
Price per share of stock issued for acquisition (in usd per share)	$ 22.90

Purchase Of Assets Consideration Transferred Equity Interests Issued And Issuable Number Of Shares

No definition available.

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