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Bank Borrowings - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Schedule Of Short And Long Term Debt [Line Items]
Short-term bank borrowings, weighted Average Interest rate	4.04%	4.04%	4.22%
Unused loan facilities (in RMB) or (in dollars)	$ 21,662	¥ 140,940	¥ 766,000
Long Term Bank Borrowings
Schedule Of Short And Long Term Debt [Line Items]
Long-term bank borrowings, weighted average interest rate	5.50%	5.50%	5.85%
Minimum
Schedule Of Short And Long Term Debt [Line Items]
Short-term bank borrowings, term	2 months
Maximum
Schedule Of Short And Long Term Debt [Line Items]
Short-term bank borrowings, term	1 year

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ 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(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

+ 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(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Schedule Of Short And Long Term Debt [Line Items]

+ References

No definition available.

+ Details

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