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Secured or Guaranteed Bank Borrowings (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Debt Instrument [Line Items]
Assets pledged as collateral	$ 48,321	¥ 335,491
Property
Debt Instrument [Line Items]
Assets pledged as collateral			¥ 7,938
Computer and network equipment
Debt Instrument [Line Items]
Assets pledged as collateral	30,886	200,954	31,506
Construction in Progress
Debt Instrument [Line Items]
Assets pledged as collateral			318,259
Long-term bank and other borrowings, (including current portion) 1 | Fixed assets
Debt Instrument [Line Items]
Assets pledged as collateral	53,015	344,932
Long-term bank and other borrowings, (including current portion) 1 | Land Use Rights [Member]
Debt Instrument [Line Items]
Assets pledged as collateral	2,585	16,818
Short-term bank borrowings 1
Debt Instrument [Line Items]
Restricted cash	$ 7,809	¥ 50,809	1,751,055
Long-term bank and other borrowings, (including current portion) 2 | Property
Debt Instrument [Line Items]
Assets pledged as collateral			7,938
Long-term bank and other borrowings, (including current portion) 3 | Computer and network equipment
Debt Instrument [Line Items]
Assets pledged as collateral			31,506
Long-term Bank and Other Borrowings (Including Current Portion) 4 | Construction in Progress
Debt Instrument [Line Items]
Assets pledged as collateral			318,259
Long-term Bank and Other Borrowings (Including Current Portion) 4 | Land Use Rights [Member]
Debt Instrument [Line Items]
Assets pledged as collateral			¥ 17,232

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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)
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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(1)(a))
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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