Geographical Information of Long-Lived Assets Based on Physical Location (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 53,135	$ 35,482
Belarus
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	40,095	26,001
Ukraine
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	5,357	4,314
Russia
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	3,234	2,011
United States
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,048	1,445
Hungary
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	1,744	1,108
Other Countries
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 657	$ 603