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Depreciation Expense (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Property, Plant and Equipment [Line Items]
Depreciation expenses	$ 80,460	¥ 523,500	¥ 480,105	¥ 402,035
Cost of Revenues
Property, Plant and Equipment [Line Items]
Depreciation expenses	70,494	458,655	397,014	328,217
Selling and Marketing Expense
Property, Plant and Equipment [Line Items]
Depreciation expenses	490	3,188	3,759	5,670
General and Administrative Expense
Property, Plant and Equipment [Line Items]
Depreciation expenses	6,405	41,675	45,746	29,753
Research and Development Expense
Property, Plant and Equipment [Line Items]
Depreciation expenses	$ 3,071	¥ 19,982	¥ 33,586	¥ 38,395

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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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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