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Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Other Operating Income (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Profit or loss [Abstract]        
Interest income ¥ 105,421 $ 16,656 ¥ 56,983 ¥ 41,314
Dividend income from held for trading investment 2,532 400 943  
Gain on disposal of subsidiaries (Note 4) 216,115 34,145    
Gain on disposal of joint venture (Note 22) 107,976 17,059    
Gain on disposal of associate 199 31    
Gain on disposal of property, plant and equipment 11,668 1,843    
Gain on disposal of intangible assets 115,235 18,206    
Gain on disposal of prepaid operating leases       2,511
Gain on liquidation of joint venture       348
Government grants 34,337 5,425 41,515 31,205
Fair value gain on held for trading investment 12,768 2,017    
Fair value gain on foreign exchange forward contract (Note 19)       15,506
Write-back of trade and other payables 29 5   9
Write-back of allowance for anticipated losses on development properties       2,976
Bad debt recovered       4,257
Foreign exchange gain, net 30,943 4,889    
Others 10,129 1,600 18,513 8,805
Other operating income ¥ 647,352 $ 102,276 ¥ 117,954 ¥ 106,931