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Discontinued operations - Disposal of Discontinued Activity (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 4 Months Ended | 7 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 12 Months Ended | 11 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | May 02, 2012 Zhejiang Continental [Member] | Dec. 31, 2010 Zhejiang Continental [Member] | Dec. 31, 2011 Zhejiang Continental [Member] | May 14, 2012 Shenyang Jingli [Member] | Dec. 31, 2011 Shenyang Jingli [Member] | Dec. 31, 2010 Shenyang Jingli [Member] | Aug. 31, 2012 Qingdao Kaixiang [Member] | Dec. 31, 2011 Qingdao Kaixiang [Member] | Dec. 31, 2010 Qingdao Kaixiang [Member] | Nov. 30, 2012 Wuxi Ruizhong [Member] | Dec. 31, 2011 Wuxi Ruizhong [Member] | Dec. 31, 2010 Wuxi Ruizhong [Member] | Dec. 31, 2012 Search Media International [Member] | Dec. 31, 2011 Search Media International [Member] | Dec. 31, 2010 Search Media International [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising service revenues | $ 30,029 | $ 55,571 | $ 48,967 | $ 379 | $ 4,370 | $ 2,611 | $ 6 | $ 471 | $ 1,246 | $ 89 | $ 2,603 | $ 4,111 | $ 1,656 | $ 2,035 | $ 2,165 | $ 27,899 | $ 47,851 | $ 37,075
Pretax profit/(loss) | (6,501) | (9,629) | (42,913) | (143) | 3,269 | 303 | 251 | (549) | (241) | (563) | 338 | 1,495 | 146 | 493 | 931 | (6,192) | (10,214) | (48,367)
Net profit / (loss) | $ 9,430 | $ (9,712) | $ (44,333) | $ (143) | $ 2,451 | $ 100 | $ 222 | $ (816) | $ (181) | $ (563) | $ 253 | $ 1,259 | $ (19) | $ 192 | $ 588 | $ (6,220) | $ (11,073) | $ (48,450)

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- Definition Amount of gross profit attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph c -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 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph c -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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