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Acquisition consideration payable - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Qingdao Kaixiang, Wuxi Ruizhong and HK Ad-Icon [Member]
Dec. 31, 2012
Qingdao Kaixiang [Member]
Dec. 31, 2011
Qingdao Kaixiang [Member]
Dec. 31, 2011
Qingdao Kaixiang [Member]
Business Acquisition [Member]
Dec. 31, 2012
Wuxi Ruizhong [Member]
Dec. 31, 2011
Wuxi Ruizhong [Member]
Dec. 31, 2012
Wuxi Ruizhong [Member]
Business Acquisition [Member]
Dec. 31, 2011
Wuxi Ruizhong [Member]
Business Acquisition [Member]
Dec. 31, 2012
HK Ad-Icon [Member]
Dec. 31, 2011
HK Ad-Icon [Member]
Dec. 31, 2012
HK Ad-Icon [Member]
Business Acquisition [Member]
Dec. 31, 2011
HK Ad-Icon [Member]
Business Acquisition [Member]
Dec. 31, 2012
Zhejiang Continental [Member]
Dec. 31, 2011
Zhejiang Continental [Member]
Dec. 31, 2012
Zhejiang Continental [Member]
Business Acquisition [Member]
Dec. 31, 2012
Haiya [Member]
Dec. 31, 2011
Haiya [Member]
Dec. 31, 2012
Haiya [Member]
Business Acquisition [Member]
Dec. 31, 2012
Shenyang Jingli [Member]
Dec. 31, 2011
Shenyang Jingli [Member]
Dec. 31, 2011
Shenyang Jingli [Member]
Business Acquisition [Member]
Dec. 31, 2012
Wenzhou Rigao [Member]
Dec. 31, 2011
Wenzhou Rigao [Member]
Dec. 31, 2011
Wenzhou Rigao [Member]
Business Acquisition [Member]
Business Acquisition Information [Line Items]                                                    
Earn-out period The purchase consideration for each acquisition is contingent based on the operational results agreed and confirmed by the Group and each of the acquired entities’ ex-owners in a 2-year earn-out period                                                  
Number of shares issued ex-owner     750,380               158,515                              
Consideration payable $ 6,364 $ 5,210   $ 4,196 $ 4,225 $ 5,210   $ 716   $ 5,210 $ 468 $ 269 $ 198 $ 5,210 $ 1,700                      
Gain on issuance of shares   4,340                 6           6,550                  
Equity interest                 100.00%               100.00%                  
Acquisition contingent consideration payable 549 23,238     4,156 6,769   571 322   99 594       8,205 8,250   3,022     1,438 6,769   3,600  
Issuance of common shares                             1,000,000   1,000,000                  
Outstanding acquisition consideration payable 3,032                                 3,032   3,032            
Shares returned                 132,272                                  
Earn-out obligation                 716                                  
Consideration exempted on disposal $ 17,968     $ 4,126     $ 1,039               $ 6,550           $ 1,437     $ 3,610   $ 3,610