Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) (Orko Silver Corporation [Member], USD $) In Thousands, unless otherwise specified	Apr. 16, 2013
Orko Silver Corporation [Member]
Business Combination, Consideration Transferred [Abstract]
Common shares issued (11,572,918 at $14.98)	$ 173,363
Cash	99,059
Warrants (1,588,768 valued at $3.64 per warrant)	5,777
Transaction advisory fees and other acquisition costs	17,642
Total purchase price	295,841
Current liabilities	2,616
Deferred income taxes	114,339
Total liabilities assumed	116,955
Total Consideration	$ 412,796

Business Combination, Consideration Transferred, Cost of Acquired Entity

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Business Combination, Consideration Transferred, Deferred Income Taxes Assumed

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Business Combination, Consideration Transferred, Fees and Expenses Paid

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Business Combination, Consideration Transferred, Liabilities Assumed, Current

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Amount of cash paid to acquire the entity.

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The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination.

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Fair Value of the liabilities incurred by the acquirer to former owners of the acquiree, including the fair value of any contingent consideration. If liabilities transferred as consideration remain within the combined entity after the business combination (for example, because the assets or liabilities were transferred to the acquiree rather than to its former owners), and the acquirer therefore retains control of them; in that situation, the acquirer measures those liabilities at their carrying amounts immediately before the acquisition date.

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This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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This element represents the acquisition-date fair value of any tangible or intangible assets, including a business or subsidiary of the acquirer, but excluding cash, transferred by the entity to the former owners of the acquire.

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