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Cash and cash equivalents - Summary of Cash on Hand and Cash Held at Bank (Detail) ¥ in Thousands, $ in Thousands, $ in Thousands	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 HKD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 HKD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Cash and Cash Equivalents [Line Items]
Cash on hand and cash held at bank		$ 233,479			$ 199,504		$ 361,777	$ 404,275
RMB [Member]
Cash and Cash Equivalents [Line Items]
Cash on hand and cash held at bank	¥ 436,794	66,847		¥ 538,660	77,651
USD [Member]
Cash and Cash Equivalents [Line Items]
Cash on hand and cash held at bank		166,530			121,726
HKD [Member]
Cash and Cash Equivalents [Line Items]
Cash on hand and cash held at bank		$ 102	$ 794		$ 127	$ 987

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- 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.

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