Segment Information on Depreciation Amortization and Depletion Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Total depreciation	$ 8,994	$ 10,837	$ 8,002
Poland
Segment Reporting Information [Line Items]
Total depreciation	2,264	2,276	2,123
Russia
Segment Reporting Information [Line Items]
Total depreciation	6,499	8,187	5,467
Hungary
Segment Reporting Information [Line Items]
Total depreciation	229	361	406
Corporate
Segment Reporting Information [Line Items]
Total depreciation	$ 2	$ 13	$ 6