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Restricted Net Asset - Additional Information (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Statutory Accounting Practices [Line Items]
Statutory reserves	$ 5,954	¥ 38,736	¥ 64,622
Restricted net asset, PRC generally accepted accounting principles (in RMB) or (in dollars)	753,321	4,901,334
PRC
Statutory Accounting Practices [Line Items]
Statutory reserves	$ 5,954	¥ 38,736	¥ 64,622
PRC | Minimum
Statutory Accounting Practices [Line Items]
Minimum required Percentage of annual after-tax profit to the general statutory reserve	10.00%	10.00%
PRC | Maximum
Statutory Accounting Practices [Line Items]
Maximum requirement of each of the Entity's PRC Subsidiaries' after-tax profits to be allocated to a general reserve fund as a percentage of each Subsidiaries' registered capital	50.00%	50.00%

X

- Definition

A segregation of retained earnings which is unavailable for dividend distribution. Includes also retained earnings appropriated for loss contingencies.

+ References

Reference 1: 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(23)(a)(4)(i))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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 210.5-03(30)(a)(3)(ii))
-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 505
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21346-112643

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21332-112643

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- Definition

Required maximum percentage of statutory surplus reserve to registered capital

+ References

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- Definition

Required Percentage of Entity's After Tax Profits to Allocate to Statutory Common Reserve.

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Restricted net assets.

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