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Fixed Assets - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2015 CNY (¥)
Property, Plant and Equipment [Abstract]
Capital leases, asset gross	$ 34,690		¥ 224,030		¥ 224,710
Capital leases, accumulated depreciation	26,960		122,430		174,630
Capital leases, future minimum lease payments					47,100
Capital leases, future minimum lease payments due in 2016					39,660
Capital leases, future minimum lease payments due in 2017					7,100
Capital leases, future minimum lease payments due in 2018					340
Capital leases, future minimum lease payments due in 2019					0
Capital leases, future minimum lease payments due in 2020					¥ 0
Fixed assets, depreciation expense	$ 442,570	¥ 2,870,000	2,190,000	¥ 1,640,000
Impairment loss on fixed assets		¥ 0	¥ 0	¥ 2,060

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. Excludes depreciation of long-term computer parts.

+ References

No definition available.

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- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 1
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- Definition

Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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