Commitments and Contingencies - Additional Information (Detail) (Breakwater Resources Limited, CAD)	6 Months Ended
Jun. 30, 2012
Breakwater Resources Limited
Commitments and Contingencies Disclosure [Line Items]
Production bonus payable, amount	500,000
Production bonus payable, payment period	30 days
Percentage of net smelter return royalty payable	1.00%

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant