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Earnings / (loss) per share - Schedule of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share [Line Items]      
Net loss from continuing operations $ (678) $ (3,747) $ (2,306)
Net profit/loss from discontinued operations 9,430 (9,712) (44,333)
Net profit/(loss) $ 8,752 $ (13,459) $ (46,639)
Weighted average shares outstanding - Basic 22,545,989 20,994,015 20,796,789
Weighted average shares outstanding - Diluted 22,784,302 20,994,015 20,796,789
Basic      
Continuing operations $ (0.03) $ (0.18) $ (0.11)
Discontinued operations $ 0.42 $ (0.46) $ (2.13)
Earnings per share basic $ 0.39 $ (0.64) $ (2.24)
Diluted      
Continuing operations $ (0.03) $ (0.18) $ (0.11)
Discontinued operations $ 0.41 $ (0.46) $ (2.13)
Earnings per share diluted $ 0.38 $ (0.64) $ (2.24)