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Changes in Accumulated Other Comprehensive (Loss) Income by Component, Net of Tax (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		¥ 6,151,017	¥ 4,034,375	¥ 2,226,957
Other comprehensive income (loss)	$ (18,592)	(120,963)	142,526	41,518
Ending Balance	799,380	5,201,004	6,151,017	4,034,375
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		118,290	(24,236)	(65,754)
Other comprehensive income (loss)		(120,963)	142,526	41,518
Ending Balance	$ (411)	¥ (2,673)	¥ 118,290	¥ (24,236)

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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