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Commitments and Contingencies - Future Minimum Rentals Receivable Under Non-cancellable Operating Leases (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Disclosure of finance lease and operating lease by lessor [Line Items]      
Future minimum rentals receivable under non-cancellable operating leases ¥ 5,691 $ 899 ¥ 3,849
One Year or Less [Member] | With third parties [Member]      
Disclosure of finance lease and operating lease by lessor [Line Items]      
Future minimum rentals receivable under non-cancellable operating leases 1,438 227 1,624
One Year or Less [Member] | With Related Parties [Member]      
Disclosure of finance lease and operating lease by lessor [Line Items]      
Future minimum rentals receivable under non-cancellable operating leases 184 29 102
After one year but not more than five years [Member] | With third parties [Member]      
Disclosure of finance lease and operating lease by lessor [Line Items]      
Future minimum rentals receivable under non-cancellable operating leases 2,491 394 1,855
After one year but not more than five years [Member] | With Related Parties [Member]      
Disclosure of finance lease and operating lease by lessor [Line Items]      
Future minimum rentals receivable under non-cancellable operating leases 268 42  
More Than Five Years [Member] | With third parties [Member]      
Disclosure of finance lease and operating lease by lessor [Line Items]      
Future minimum rentals receivable under non-cancellable operating leases ¥ 1,310 $ 207 ¥ 268