Borrowings (Bank Facilities) (Detail) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended		0 Months Ended	3 Months Ended		1 Months Ended			3 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended			0 Months Ended		3 Months Ended							3 Months Ended				3 Months Ended
	Mar. 29, 2012 Zenit Bank [Member] Loan Agreement [Member] USD ($) Tranches	Mar. 29, 2012 Zenit Bank [Member] Loan Agreement [Member] EUR (€) Tranches	Mar. 31, 2012 Zenit Bank [Member] Loan Agreement [Member] USD ($)	Mar. 31, 2012 Zenit Bank [Member] Loan Agreement [Member] EUR (€)	Mar. 29, 2011 Zenit Bank [Member] Minimum [Member] Loan Agreement [Member]	Mar. 31, 2012 Zenit Bank [Member] Minimum [Member] Loan Agreement [Member]	Mar. 31, 2012 Zenit Bank [Member] Maximum [Member] Loan Agreement [Member]	Jul. 22, 2008 Alfa Bank [Member]	Jul. 22, 2008 Alfa Bank [Member] Loan Agreement [Member] USD ($) Tranches	Jul. 22, 2008 Alfa Bank [Member] Loan Agreement [Member] EUR (€) Tranches	Mar. 31, 2012 Alfa Bank [Member] Loan Agreement [Member] USD ($)	Mar. 31, 2012 Alfa Bank [Member] Loan Agreement [Member] EUR (€)	Jul. 22, 2008 Alfa Bank [Member] Minimum [Member] Loan Agreement [Member]	Mar. 31, 2012 Alfa Bank [Member] Minimum [Member] Loan Agreement [Member]	Jul. 22, 2008 Alfa Bank [Member] Maximum [Member] Loan Agreement [Member]	Mar. 31, 2012 Alfa Bank [Member] Maximum [Member] Loan Agreement [Member]	Mar. 31, 2012 Raiffeisen Bank [Member] USD ($)	Mar. 31, 2012 Raiffeisen Bank [Member] EUR (€)	Jul. 06, 2010 Raiffeisen Bank [Member] Loan Agreement [Member] USD ($) Tranches	Jul. 06, 2010 Raiffeisen Bank [Member] Loan Agreement [Member] EUR (€) Tranches	Mar. 31, 2012 Raiffeisen Bank [Member] Loan Agreement [Member]	Mar. 31, 2012 Raiffeisen Bank [Member] Minimum [Member]	Mar. 31, 2012 Raiffeisen Bank [Member] Minimum [Member] Loan Agreement [Member]	Mar. 31, 2012 Raiffeisen Bank [Member] Maximum [Member]	Mar. 31, 2012 Raiffeisen Bank [Member] Maximum [Member] Loan Agreement [Member]	Mar. 31, 2012 Unicredit And JSC Grand Invest Bank [Member] Loan Agreement [Member] USD ($)	Mar. 31, 2012 Unicredit And JSC Grand Invest Bank [Member] Loan Agreement [Member] RUB	Mar. 31, 2012 Unicredit [Member] Loan Agreement [Member] USD ($)	Mar. 31, 2012 Unicredit [Member] Loan Agreement [Member] RUB	May 24, 2011 Unicredit [Member] Loan Agreement [Member] USD ($)	May 24, 2011 Unicredit [Member] Loan Agreement [Member] RUB	Mar. 31, 2012 JSC Grand Invest Bank [Member] Loan Agreement [Member] USD ($)	Mar. 31, 2012 JSC Grand Invest Bank [Member] Loan Agreement [Member] RUB	Mar. 31, 2012 Sberbank [Member] Overdraft Agreement [Member] USD ($)	Mar. 31, 2012 Sberbank [Member] Overdraft Agreement [Member] RUB	Feb. 06, 2012 Sberbank [Member] Overdraft Agreement [Member] USD ($)	Feb. 06, 2012 Sberbank [Member] Overdraft Agreement [Member] RUB	Mar. 31, 2012 Zenit Bank, Alfa Bank And Raiffeisen Bank [Member] USD ($)	Mar. 31, 2012 Zenit Bank, Alfa Bank And Raiffeisen Bank [Member] EUR (€)	Mar. 31, 2012 Hungary [Member] Overdraft Agreement [Member] USD ($)	Mar. 31, 2012 Hungary [Member] Overdraft Agreement [Member] HUF
Line of Credit Facility [Line Items]
Outstanding liability			$ 6.7	€ 5.0							$ 20.1	€ 15.1					$ 6.5	€ 4.9								$ 30.0	879.6	$ 20.5	600.0			$ 9.5	279.6	$ 1.8	52.5			$ 33.4	€ 25.0
Maximum credit limit under line of credit facility	13.3	10.0							26.7	20.0									13.3	10.0																2.0	60.0
Release of tranches, maturity date					365 days			Six months					Three months		Nine months							One		12
Loan agreement, number of tranches	4	4							8	8									5	5
Initiation date			March 29, 2011	March 29, 2011							July 22, 2008	July 22, 2008									July 6, 2010							May 24, 2011	May 24, 2011			November 25, 2011	November 25, 2011	February 6, 2012	February 6, 2012
Maturity date			June 6, 2012	June 6, 2012							October 18, 2014	October 18, 2014									July 6, 2012							November 23, 2012	November 23, 2012			November 23, 2012	November 23, 2012	February 5, 2013	February 5, 2013
Date of tranches release, start date			April 21, 2011	April 21, 2011							September 14, 2011	September 14, 2011									September 12, 2011
Date of tranches release, end date			September 13, 2011	September 13, 2011							March 30, 2012	March 30, 2012									October 26, 2011
Repayable date						April 20, 2012	May 18, 2012							April 28, 2012		October 30, 2012							May 18, 2012		July 6, 2012
Amount of collateral on term loan																														24.6	720.0
Amount available under open credit facility																																								$ 0.5	100.0