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Borrowings (Bank Facilities) (Detail)
In Millions, unless otherwise specified
 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 6 Months Ended
Feb. 06, 2012
Overdraft Agreement [Member]
USD ($)
Jun. 30, 2012
Alfa Bank [Member]
Jul. 22, 2008
Alfa Bank [Member]
Loan Agreement [Member]
USD ($)
Jul. 22, 2008
Alfa Bank [Member]
Loan Agreement [Member]
EUR (€)
Jun. 30, 2012
Alfa Bank [Member]
Loan Agreement [Member]
USD ($)
Tranches
Jun. 30, 2012
Alfa Bank [Member]
Loan Agreement [Member]
EUR (€)
Tranches
Jun. 30, 2012
Alfa Bank [Member]
Loan Agreement [Member]
Minimum [Member]
Jun. 30, 2012
Alfa Bank [Member]
Loan Agreement [Member]
Maximum [Member]
Jun. 30, 2012
Raiffeisen Bank [Member]
USD ($)
Jun. 30, 2012
Raiffeisen Bank [Member]
EUR (€)
Jun. 30, 2012
Raiffeisen Bank [Member]
Minimum [Member]
Jun. 30, 2012
Raiffeisen Bank [Member]
Maximum [Member]
Jul. 06, 2010
Raiffeisen Bank [Member]
Loan Agreement [Member]
USD ($)
Tranches
Jul. 06, 2010
Raiffeisen Bank [Member]
Loan Agreement [Member]
EUR (€)
Tranches
Jun. 30, 2012
Raiffeisen Bank [Member]
Loan Agreement [Member]
Jun. 30, 2012
Unicredit [Member]
Loan Agreement [Member]
USD ($)
Jun. 30, 2012
Unicredit [Member]
Loan Agreement [Member]
RUB
May 24, 2011
Unicredit [Member]
Loan Agreement [Member]
USD ($)
May 24, 2011
Unicredit [Member]
Loan Agreement [Member]
RUB
Jun. 30, 2012
JSC Grand Invest Bank [Member]
Loan Agreement [Member]
USD ($)
Jun. 30, 2012
JSC Grand Invest Bank [Member]
Loan Agreement [Member]
RUB
Jun. 30, 2012
Sberbank [Member]
Overdraft Agreement [Member]
Feb. 06, 2012
Sberbank [Member]
Overdraft Agreement [Member]
RUB
Jun. 30, 2012
Zenit Bank, Alfa Bank And Raiffeisen Bank [Member]
USD ($)
Jun. 30, 2012
Zenit Bank, Alfa Bank And Raiffeisen Bank [Member]
EUR (€)
Jun. 30, 2012
Unicredit And JSC Grand Invest Bank [Member]
Loan Agreement [Member]
USD ($)
Jun. 30, 2012
Unicredit And JSC Grand Invest Bank [Member]
Loan Agreement [Member]
RUB
Jun. 30, 2012
Hungary [Member]
Overdraft Facility [Member]
USD ($)
Jun. 30, 2012
Hungary [Member]
Overdraft Facility [Member]
HUF
Line of Credit Facility [Line Items]                                                          
Outstanding liability         $ 25.2 € 20.0     $ 3.1 € 2.5           $ 18.2 600.0     $ 7.5 245.5     $ 28.3 € 22.5 $ 25.7 845.5    
Initiation date         July 22, 2008 July 22, 2008                 July 6, 2010 May 24, 2011 May 24, 2011     November 25, 2011 November 25, 2011 February 6, 2012              
Maturity date     October 18, 2014 October 18, 2014                     July 6, 2012 November 23, 2012 November 23, 2012     November 23, 2012 November 23, 2012 February 5, 2013              
Maximum credit limit under line of credit facility 1.8   25.2 20.0                 12.6 10.0                 60.0            
Release of tranches, maturity date   Six         Three Nine     One 12                                  
Loan agreement, number of tranches         7 7             3 3                              
Date of tranches release, start date         March 13, 2012 March 13, 2012                 October 12, 2011                            
Date of tranches release, end date         June 28, 2012 June 28, 2012                 October 27, 2011                            
Repayable date             September 13, 2012 December 28, 2012                                          
Amount of collateral on term loan                                   21.9 720.0                    
Amount available under open credit facility                                                       $ 0.4 100.0