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Commitments and Contingencies - Future Minimum Rentals Payable Under Non-cancellable Operating Leases (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Disclosure of finance lease and operating lease by lessee [line items]      
Future minimum rentals payable under non-cancellable operating leases $ 15,201 ¥ 101,700 ¥ 35,363
One year or less [member] | Third parties [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Future minimum rentals payable under non-cancellable operating leases 1,680 11,238 14,058
One year or less [member] | Related parties [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Future minimum rentals payable under non-cancellable operating leases 3,291 22,020 5,578
After one year but not more than five years [member] | Third parties [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Future minimum rentals payable under non-cancellable operating leases 2,505 16,759 14,003
After one year but not more than five years [member] | Related parties [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Future minimum rentals payable under non-cancellable operating leases $ 7,725 ¥ 51,683 ¥ 1,724