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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
	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)

X

- 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

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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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

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-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.



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-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.



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-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.



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