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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