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Summary of Bank Borrowings (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | ---
Debt Disclosure [Abstract] |  |  |
Short-term bank borrowings | $ 7,685 | ¥ 50,000 | ¥ 1,683,676
Long-term bank borrowings, current portion | 10,803 | 70,289 | 39,303
Debt, Current, Total | 18,488 | 120,289 | 1,722,979
Long-term bank borrowings, non-current portion | 28,839 | 187,638 | 268,221
Total bank borrowings | $ 47,327 | ¥ 307,927 | ¥ 1,991,200

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