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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.

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Amount awarded to other party in judgment or settlement of litigation.

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No definition available.

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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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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.

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No definition available.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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The amount purchased during the period under an unrecorded unconditional purchase obligation (for example, under the take-or-pay or throughput contract).

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