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Fair Value Measurement - Fair Value Measurement Hierarchy for Assets and Liabilities (Detail) ¥ in Thousands, $ in Thousands		Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)
Disclosure of detailed information about financial instruments [line items]
Financial assets		¥ 12,434,653	$ 1,966,825	¥ 14,612,382
Bill receivables [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	[1]	3,338,816	528,110	7,793,343
Thakral Corporation Ltd [Member] | Quoted Equity Shares [Member] | Quoted Equity Securities [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets		606	$ 96	6,258
Quoted prices in active markets (Level 1) [Member] | Thakral Corporation Ltd [Member] | Quoted Equity Shares [Member] | Quoted Equity Securities [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets		606		6,258
Significant observable inputs (Level 2) [Member] | Bill receivables [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	[1]	¥ 3,338,816		¥ 7,793,343
[1] The fair value of the Group’s debt financial assets is measured based on quoted market interest rates of similar instruments.

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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