Financial Risk Management Objectives and Policies - Maturity Profile of Financial Assets and Liabilities Based on Contractual Undiscounted Payments (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)
Financial assets
Cash and bank balances	¥ 5,331,555	$ 843,307	¥ 6,447,538
Financial assets	12,434,653	1,966,825	14,612,382
Financial liabilities
Trade and other payables (Note 22)	9,827,840	1,554,497	10,302,531
Lease liabilities	40,531	6,410	39,778
Financial liabilities	12,019,157	1,901,103	12,486,410
Liquidity risk [member]
Financial assets
Trade and bills receivables	6,961,657	1,101,145	8,082,391
Other receivables, excluding tax recoverable	140,835	22,277	76,195
Cash and bank balances	5,331,555	843,307	6,447,538
Quoted equity securities	606	96	6,258
Financial assets	12,434,653	1,966,825	14,612,382
Financial liabilities
Loans and borrowings	2,231,880	353,023	2,277,417
Trade and other payables (Note 22)	9,775,626	1,546,238	10,216,632
Lease liabilities	41,771	6,607	47,399
Financial liabilities	12,049,277	$ 1,905,868	12,541,448
Liquidity risk [member] \| One year or less [member]
Financial assets
Trade and bills receivables	6,961,657		8,082,391
Other receivables, excluding tax recoverable	140,835		76,195
Cash and bank balances	5,221,555		6,307,538
Quoted equity securities	606		6,258
Financial assets	12,324,653		14,472,382
Financial liabilities
Loans and borrowings	2,130,356		1,753,142
Trade and other payables (Note 22)	9,586,901		10,025,069
Lease liabilities	28,121		24,313
Financial liabilities	11,745,378		11,802,524
Liquidity risk [member] \| Two to five years [member]
Financial assets
Cash and bank balances	110,000		140,000
Financial assets	110,000		140,000
Financial liabilities
Loans and borrowings	101,524		524,275
Trade and other payables (Note 22)	188,725		191,563
Lease liabilities	13,650		22,761
Financial liabilities	¥ 303,899		738,599
Liquidity risk [member] \| More than five years [member]
Financial liabilities
Lease liabilities			325
Financial liabilities			¥ 325

Cash and bank balances.

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Other receivables, excluding tax recoverable.

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Quoted equity securities and derivative not designated as hedges foreign exchange forward contract.

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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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