Commitments And Contingent Liabilities (Narrative) (Detail) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2011 RUB	Dec. 31, 2011 Minimum [Member]	Dec. 31, 2011 Maximum [Member]	Dec. 31, 2011 Poland [Member] USD ($)
Commitments And Contingent Liabilities [Line Items]
Amount under bank guarantee	$ 578.1	18,500.0			$ 1.8
Term of bank guarantee, years			2	5