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Reconciliation Tax Computed Applying Statutory Income Tax Rate (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Income Tax Disclosure [Abstract] |  |  |  |
Loss before income taxes | $ (154,899) | ¥ (1,007,814) | ¥ (943,082) | ¥ (353,445)
Income tax benefit computed at applicable tax rates (25%) | 38,725 | 251,954 | 235,770 | 88,361
Non-deductible expenses | (840) | (5,468) | (16,610) | (19,216)
Research and development expenses | 1,828 | 11,895 | 7,766 | 6,871
Effect of tax holidays |  |  | 1,691 | 2,743
Preferential rate | (13,844) | (90,076) | (11,060) | 6,183
Current and deferred tax rate differences | 5,128 | 33,366 | (1,521) | (2,876)
International rate differences | 9,073 | 59,029 | (51,392) | (90,773)
Tax exempted income |  |  | 9,878 |
Unrecognized tax benefits | (962) | (6,259) | (14,525) | (529)
Deferred tax expense | 438 | 2,851 | 1,516 | (387)
Change in valuation allowance | (26,803) | (174,388) | (158,724) | (36,529)
Prior year provision to return true up | 1,116 | 7,266 | 8,371 | (1,678)
Income tax (expense) benefits | $ 13,859 | ¥ 90,170 | ¥ 11,160 | ¥ (47,830)

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