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Secured or Guaranteed Bank Borrowings (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Debt Instrument [Line Items]
Short-term borrowings	$ 7,685	¥ 50,000	¥ 1,683,676
Long-term bank and other borrowings (including current portion)		257,927	307,524
Unsecured Borrowing
Debt Instrument [Line Items]
Short-term borrowings			143,676
Long-term bank and other borrowings (including current portion)		99,927	128,107
Secured by a Subsidiary's Construction-in-Progress | Long-term bank and other borrowings, (including current portion) 1
Debt Instrument [Line Items]
Long-term bank and other borrowings (including current portion)		158,000
Secured by a Subsidiary's Construction-in-Progress | Long-term Bank and Other Borrowings (Including Current Portion) 4
Debt Instrument [Line Items]
Long-term bank and other borrowings (including current portion)			164,000
Secured by restricted cash | Short-term bank borrowings 1
Debt Instrument [Line Items]
Short-term borrowings		¥ 50,000
Secured by a subsidiary building | Long-term bank and other borrowings, (including current portion) 2
Debt Instrument [Line Items]
Long-term bank and other borrowings (including current portion)			1,600
Secured by a subsidiary's computer and network equipment | Long-term bank and other borrowings, (including current portion) 3
Debt Instrument [Line Items]
Long-term bank and other borrowings (including current portion)			13,817
Guaranteed by restricted cash | Short-term bank borrowings 1
Debt Instrument [Line Items]
Short-term borrowings			1,520,000
Guaranteed by noncontrolling shareholder of Aipu Group | Short-term bank borrowings 2
Debt Instrument [Line Items]
Short-term borrowings			¥ 20,000

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+ 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(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16)(a)(2))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: 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(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 944
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