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Commitments and contingencies - Additional Information (Detail) ¥ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 USD ($) | Apr. 25, 2018
Loss Contingencies [Line Items] |  |  |  |  |  |
Legal and litigation related expenses | $ 9,453,000 |  | $ 1,669,000 |  | $ 3,307,000 |
Legal and litigation related expenses | 1,755,000 |  | $ 2,904,000 |  |  |
Litigation Settlement, Amount Awarded to Other Party | 3,900,000 |  |  |  |  |
Pending Litigation [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of lawsuits pending |  |  | 39 |  |  |
Aggregate amount of claimed damages | 16,760,000 | ¥ 112,000 | $ 12,870,000 | ¥ 89,270 |  |
Pending Litigation [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of lawsuits pending |  |  |  |  |  | 42
Switchboard, Servers, Office Software And Construction In Process [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Irrevocable purchase obligations | 4,368,000 |  |  |  |  |
Rental commitments [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Total lease expenses | 2,976,000 |  | 2,382,000 |  | 2,751,000 |
Bandwidth Lease Commitments [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Total lease expenses for continuing operations | $ 68,441,000 |  | $ 55,135,000 |  | 37,218,000 |
Total lease expenses for discontinued operations |  |  |  |  | $ 2,983,000 |

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- Definition Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position. + 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 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6396582&loc=d3e15243-108350 + Details
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