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Contract Liabilities - Summary of Contract Liabilities (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)		Jan. 01, 2017 CNY (¥)
Disclosure of contract liabilities [line items]
Contract liabilities	$ 50,894	¥ 340,489	¥ 233,329		¥ 213,286
Current	42,867	286,786	198,570	[1]	185,914	[1]
Non-current	8,027	53,703	34,759	[1]	¥ 27,372	[1]
Unfulfilled maintenance services [member]
Disclosure of contract liabilities [line items]
Contract liabilities	28,658	191,728	115,864
Advance from customer [member]
Disclosure of contract liabilities [line items]
Contract liabilities	$ 22,236	¥ 148,761	¥ 117,465
[1] Restated

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- Definition

Disclosure of contract liabilities.

+ References

No definition available.

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- Definition

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of current contract liabilities. [Refer: Contract liabilities]

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- Definition

The amount of non-current contract liabilities. [Refer: Contract liabilities]

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