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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 |  |  |  |
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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

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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 99-12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Income (expense) and gain (loss) recognized from the settlement of a preexisting relationship between the acquirer and the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 04-1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 57 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph m(1-4) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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