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Financial Assets and Financial Liabilities - Schedule of Changes in Liabilities Arising From Financing Activities (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | ¥ 2,115,053 |  | ¥ 2,016,140
Effect of adoption of IFRS 16 |  |  | 96,804
Cash flows | 136,159 |  | (11,304)
Addition | 15,256 |  | 11,473
Accretion of interest | 2,198 |  | 2,918
Foreign exchange movement | 1,228 |  | (1,469)
Translation reserve | (116) |  | 491
Ending balance | 2,269,778 | $ 350,745 | 2,115,053
Increase (decrease) due to changes in accounting policy [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  |  | 2,112,944
Short-term borrowings [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 2,055,046 |  | 2,001,014
Cash flows | (326,280) |  | 39,979
Foreign exchange movement | 1,228 |  | (1,469)
Translation reserve | 6 |  | 444
Other |  |  | 15,078
Ending balance | 1,730,000 | 267,334 | 2,055,046
Short-term borrowings [member] | Increase (decrease) due to changes in accounting policy [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  |  | 2,001,014
Long-term borrowings [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  |  | 15,078
Cash flows | 500,000 |  |
Other |  |  | (15,078)
Ending balance | 500,000 | 77,264 |
Long-term borrowings [member] | Increase (decrease) due to changes in accounting policy [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  |  | 15,078
Obligations under finance leases current [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  |  | 14
Effect of adoption of IFRS 16 |  |  | (14)
Obligations under finance leases noncurrent [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  |  | 34
Effect of adoption of IFRS 16 |  |  | (34)
Lease Liabilities Current [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 28,633 |  |
Effect of adoption of IFRS 16 | (37,561) |  | 42,457
Cash flows |  |  | (51,283)
Addition | 4,039 |  | 6,008
Accretion of interest | 2,198 |  | 2,918
Translation reserve | 409 |  | 24
Other | 25,037 |  | 28,509
Ending balance | 22,755 | 3,516 | 28,633
Lease Liabilities Current [Member] | Increase (decrease) due to changes in accounting policy [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  |  | 42,457
Lease Liabilities Noncurrent [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 31,374 |  |
Effect of adoption of IFRS 16 |  |  | 54,395
Addition | 11,217 |  | 5,465
Translation reserve | (531) |  | 23
Other | (25,037) |  | (28,509)
Ending balance | ¥ 17,023 | $ 2,631 | 31,374
Lease Liabilities Noncurrent [Member] | Increase (decrease) due to changes in accounting policy [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  |  | ¥ 54,395

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