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Discontinued operations - Schedule of Cumulative Gain on Disposal Activity (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Add/Less: Net book value of liability in connection with the disposal/divestiture   $ 61,856
Less: Goodwill writeoff   (16,926)
Gain/(loss) on disposal of discontinued components 16,153  
Zhejiang Continental [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total consideration on disposal (1,700)  
Add/Less: Extinguishment of current accounts 80  
Add: Earn-out consideration payable settled 8,250  
Add/Less: Net book value of assets in connection with the disposal/divestiture (1,170)  
Gain/(loss) on disposal of discontinued components 5,460  
Shenyang Jingli [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total consideration on disposal     
Add/Less: Extinguishment of current accounts 1,586  
Add: Extinguishment of acquisition consideration payable 1,437  
Add/Less: Net book value of liability in connection with the disposal/divestiture 1,641  
Gain/(loss) on disposal of discontinued components 4,664  
Qingdao Kaixiang [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total consideration on disposal     
Add/Less: Extinguishment of current accounts 1,891  
Add: Extinguishment of acquisition consideration payable 4,126  
Add/Less: Net book value of assets in connection with the disposal/divestiture (4,574)  
Less: Goodwill writeoff (3,261)  
Gain/(loss) on disposal of discontinued components (1,818)  
Wuxi Ruizhong [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total consideration on disposal 147  
Add: Obligation exempted 328  
Add/Less: Extinguishment of current accounts 1,414  
Add: Extinguishment of acquisition consideration payable 322  
Add/Less: Net book value of assets in connection with the disposal/divestiture (1,750)  
Less: Goodwill writeoff (3,103)  
Gain/(loss) on disposal of discontinued components (2,642)  
Search Media International [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total consideration on disposal (421)  
Add/Less: Extinguishment of current accounts (107,243)  
Add/Less: Net book value of liability in connection with the disposal/divestiture 118,153  
Gain/(loss) on disposal of discontinued components $ 10,489