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Carrying Amounts of Property and Equipment Pledged to Secure Banking Borrowings (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Property, Plant and Equipment [Line Items]
Assets pledged as collateral	$ 48,321	¥ 335,491
Property
Property, Plant and Equipment [Line Items]
Assets pledged as collateral			¥ 7,938
Leasehold improvements
Property, Plant and Equipment [Line Items]
Assets pledged as collateral	22,116	143,893
Computer and network equipment
Property, Plant and Equipment [Line Items]
Assets pledged as collateral	30,886	200,954	31,506
Office equipment
Property, Plant and Equipment [Line Items]
Assets pledged as collateral	$ 13	¥ 85
Construction in Progress
Property, Plant and Equipment [Line Items]
Assets pledged as collateral			¥ 318,259

X

- Definition

The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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- Details

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- Details

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- Details

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