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Taxation - Schedule of Movement of Valuation Allowance (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ (9,995)us-gaap_DeferredTaxAssetsValuationAllowance	(62,017)us-gaap_DeferredTaxAssetsValuationAllowance	(62,938)us-gaap_DeferredTaxAssetsValuationAllowance
Disposal of CAH and WHT	9,017us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsDisposals	55,949us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsDisposals
Change of valuation allowance in the current year	(76)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	(466)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	921us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Balance at end of year	$ (1,054)us-gaap_DeferredTaxAssetsValuationAllowance	(6,534)us-gaap_DeferredTaxAssetsValuationAllowance	(62,017)us-gaap_DeferredTaxAssetsValuationAllowance

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 45

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318

+ Details

Name:	us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Reduction in valuation allowance of servicing assets based on disposal of the related asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

+ Details

Name:	us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsDisposals
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration