Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Detail)

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Subsequent Events (Detail) (AUD)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Subsequent Event [Line Items]  
Cash proceeds 141
Sonoma [Member]
 
Subsequent Event [Line Items]  
Economic interest percentage 45.00%