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Financial Assets and Financial Liabilities - Schedule of Changes in Liabilities Arising From Financial Activities (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Beginning balance ¥ 910,514   ¥ 2,455,818
Cash flows 714,447   (1,537,609)
Foreign exchange movement 1,634   (10,855)
Translation reserve (175)   3,107
Other     53
Ending balance 1,626,420 $ 256,963 910,514
Short Term Borrowings [Member]      
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Beginning balance 894,136   2,399,195
Cash flows 705,109   (1,535,532)
Foreign exchange movement 755   (9,608)
Other     40,081
Ending balance 1,600,000 252,789 894,136
Long Term Borrowings [member]      
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Beginning balance 16,270   56,509
Cash flows 9,376   (2,015)
Foreign exchange movement 879   (1,242)
Translation reserve (184)   3,099
Other     (40,081)
Ending balance 26,341 4,162 16,270
Obligations under Finance Leases Current [Member]      
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Beginning balance 38   59
Cash flows (38)   (62)
Foreign exchange movement     (5)
Translation reserve 9   8
Other 24   38
Ending balance 33 5 38
Obligations under Finance Leases Non-current [Member]      
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Beginning balance 70   55
Other (24)   15
Ending balance ¥ 46 $ 7 ¥ 70