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Depreciation Expense (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Property, Plant and Equipment [Line Items]        
Depreciation expenses $ 80,460 ¥ 523,500 ¥ 480,105 ¥ 402,035
Cost of Revenues        
Property, Plant and Equipment [Line Items]        
Depreciation expenses 70,494 458,655 397,014 328,217
Selling and Marketing Expense        
Property, Plant and Equipment [Line Items]        
Depreciation expenses 490 3,188 3,759 5,670
General and Administrative Expense        
Property, Plant and Equipment [Line Items]        
Depreciation expenses 6,405 41,675 45,746 29,753
Research and Development Expense        
Property, Plant and Equipment [Line Items]        
Depreciation expenses $ 3,071 ¥ 19,982 ¥ 33,586 ¥ 38,395