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Condensed Statement of Comprehensive Loss (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Condensed Consolidating Statement of Other Comprehensive Income (Loss) [Line Items]
Net loss	$ (118,767)	¥ (772,730)	¥ (633,598)	¥ (428,099)
Other comprehensive income (loss), net of tax of nil:
Foreign currency translation adjustments, net of tax of nil	18,592	120,963	(142,526)	(41,518)
Comprehensive loss	(159,632)	(1,038,607)	(789,396)	(359,757)
Comprehensive loss attributable to the Company's ordinary shareholders	(137,359)	(893,693)	(491,072)	(386,581)
Parent Company
Condensed Consolidating Statement of Other Comprehensive Income (Loss) [Line Items]
Net loss	(118,767)	(772,730)	(633,598)	(428,099)
Other comprehensive income (loss), net of tax of nil:
Foreign currency translation adjustments, net of tax of nil	(18,592)	(120,963)	142,526	41,518
Other comprehensive income (loss), net of tax of nil:	(18,592)	(120,963)	142,526	41,518
Comprehensive loss	(137,359)	(893,693)	(491,072)	(386,581)
Comprehensive loss attributable to the Company's ordinary shareholders	$ (137,359)	¥ (893,693)	¥ (491,072)	¥ (386,581)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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