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Other receivables and prepayments, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
CNY (¥)
Deposits (Note a)     ¥ 342,703   ¥ 436,402
Cash advanced to staff     12,847   17,060
Loans to staff     30,702   20,900
VAT recoverable     791,156   770,949
Interest receivable     25,871   100,402
Advances to suppliers related to financing activities (Note b)     1,525,567   1,269,898
Advances to suppliers related to procurement activities     646,027   707,233
Prepaid expense     152,179   119,436
Others     190,241   192,064
Subtotal     3,717,293   3,634,344
Less: allowance for doubtful accounts     (43,097)   (39,608)
Total $ 522,833   3,674,196   ¥ 3,594,736
Allowance for doubtful accounts:          
Provision for allowance during the year $ (25,512) ¥ (175,405) (130,862) ¥ (57,743)  
Other receivables and prepayments, net          
Allowance for doubtful accounts:          
Balance at beginning of the year   (43,097) (23,418) (11,884)  
Provision for allowance during the year   (5,220) (19,679) (13,259)  
Write-offs during the year   8,709   1,725  
Balance at end of the year   ¥ (39,608) ¥ (43,097) ¥ (23,418)