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Short-Term and Long-Term Loans (Parenthetical) (Detail)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 ZAR	Dec. 31, 2014 USD ($)	Dec. 31, 2014 ZAR
Debt Instrument [Line Items]
Notes issued, face value	$ 1,000,000,000
$200 million non-revolving senior secured term loan
Debt Instrument [Line Items]
Long-term revolving credit facility	200,000,000		$ 200,000,000
La Cima Revolving Senior Secured Credit Facility
Debt Instrument [Line Items]
Long-term revolving credit facility	200,000,000		200,000,000
$1 billion notes issue
Debt Instrument [Line Items]
Notes issued, face value	1,000,000,000		1,000,000,000
$70 million senior secured revolving credit facility
Debt Instrument [Line Items]
Long-term revolving credit facility	70,000,000		70,000,000
$1,510 million term loan and revolving credit facility
Debt Instrument [Line Items]
Long-term revolving credit facility	$ 1,510,000,000		$ 1,510,000,000
R1,500 million Nedbank revolving credit facility
Debt Instrument [Line Items]
Long-term revolving credit facility | ZAR		ZAR 1,500,000,000		ZAR 1,500,000,000

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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