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Summary of Assets Held for Sale (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	$ 47.0	[1]
Arctic Platinum [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	31.0
Yanfolila
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	$ 16.0	[1]
[1] Refer to note 4 for details on the impairments of this asset.

X

- Definition

Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

+ Details

Name:	us-gaap_AssetsHeldForSaleLongLived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_LongLivedAssetsHeldForSaleLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration