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Investment in Joint Ventures - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Jan. 01, 2017
CNY (¥)
 [1]
Dec. 31, 2015
CNY (¥)
 [1]
Disclosure of joint ventures [line items]                  
Assets classified as held for sale     ¥ 89,400            
Foreign translation reserve     22,700            
Gain on disposal of joint venture ¥ 107,976 [1]              
Share of capital commitment       $ 5,700 ¥ 38,000   ¥ 30,000    
Cash and cash equivalents     ¥ 3,653,914 [1] 831,062 5,559,890 $ 805,717 5,390,324 [1] ¥ 3,653,914 ¥ 3,474,364
People's Republic of China [member]                  
Disclosure of joint ventures [line items]                  
Cash and cash equivalents       4,100 27,300   67,200    
Y & C Engine Co., Ltd. [Member]                  
Disclosure of joint ventures [line items]                  
Cash and cash equivalents         113,061   199,925    
Y & C Engine Co., Ltd. [Member] | Outstanding bills receivables discounted with banks by retain recourse obligation [member]                  
Disclosure of joint ventures [line items]                  
Share of outstanding bills receivables       14,600 98,000   0    
Y & C Engine Co., Ltd. [Member] | Outstanding Bills Receivables Endorsed To Suppliers by Retain Recourse Obligation [Member]                  
Disclosure of joint ventures [line items]                  
Share of outstanding bills receivables       200 1,700   23,300    
Joint ventures [member]                  
Disclosure of joint ventures [line items]                  
Cash and cash equivalents       20,145 134,768   312,980    
Share of restricted trade receivables       0 0   6,800    
Share of restricted cash       11,200 33,800   80,500    
Bills receivables       0 0   12,200    
Joint ventures [member] | Letter Of Credit Facilities [member]                  
Disclosure of joint ventures [line items]                  
Share of restricted cash       $ 200 ¥ 700   ¥ 0    
Copthorne Hotel Qingdao Co Ltd [member]                  
Disclosure of joint ventures [line items]                  
Gain on disposal of joint venture   ¥ 108,000              
[1] Restated