XML 69 R71.htm IDEA: XBRL DOCUMENT v2.4.0.6
Tax Years Open for Assessments (Parenthetical) (Detail) (Maximum)
12 Months Ended
Dec. 31, 2012
South Africa
 
Income Tax Examination [Line Items]  
Revenue authorities tax examination period 3 years
Australia
 
Income Tax Examination [Line Items]  
Revenue authorities tax examination period 4 years
Peru
 
Income Tax Examination [Line Items]  
Revenue authorities tax examination period 4 years