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Discontinued operations - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Elimination of certain outstanding payables, earn-out liabilities and tax provisions $ 41,600,000  
Contingent Acquisition Payable 99,000 16,820,000
Option to acquire Shares in Tiger Media 387,188  
Option to acquire Shares in Tiger Media, Exercise Shares $ 5.47  
Extinguished acquisition payable 17,968,000  
Zhejiang Continental [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Percentage of divested in equity shares 100.00%  
Contingent Acquisition Payable 8,250,000 8,205,000
Issuance of ordinary shares 1,000,000  
Extinguished acquisition payable 6,550,000  
Shenyang Jingli [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Percentage of divested in equity shares 100.00%  
Contingent Acquisition Payable 1,437,000  
Extinguished acquisition payable 1,437,000  
Qingdao Kaixiang [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Percentage of divested in equity shares 100.00%  
Contingent Acquisition Payable 4,126,000 4,156,000
Extinguished acquisition payable 4,126,000  
Wuxi Ruizhong [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Percentage of divested in equity shares 100.00%  
Contingent Acquisition Payable 322,000 571,000
Extinguished acquisition payable 1,039,000  
Search Media International [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Option to acquire Shares in Tiger Media 650,000  
Option to acquire Shares in Tiger Media, Exercise Shares $ 1.25  
Description Regarding Arrangement For Collection Of Receivables The independent third party will pursue the collection of all receivables and all claims for SearchMedia International, for the benefit of Tiger Media and share 50% of any receivables, net proceeds, awards or judgments from any claims or lawsuits brought about by SearchMedia International entities; provided, however, 100% of any sale proceeds from the sale or transfer of any of the SearchMedia International's subsidiaries  
Percentage of net proceeds from transfer of discontinued operations 50.00%  
Percentage of net proceeds from transfer of subsidiaries 100.00%  
Wanshuizhiyuan [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Extinguished acquisition payable 1,206,000  
Wenzhou Rigao [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Contingent Acquisition Payable   2,116,000
Extinguished acquisition payable $ 3,610,000