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, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)
Financial assets
Trade and bills receivables	¥ 12,150	$ 1,920	¥ 0
Cash and bank balances	6,029,207	952,572	4,052,957
Financial assets	13,218,760	2,088,471	11,370,669
Financial liabilities
Derivative not designated as hedges - foreign exchange forward contract			140
Trade and other payables (Note 28)	7,624,496	1,204,616	6,981,815
Other liabilities	79	12	248
Financial liabilities	9,060,142	1,431,438	7,581,144
Liquidity risk [Member]
Financial assets
Trade and bills receivables	7,075,319	1,117,850	7,111,890
Other receivables, excluding tax recoverable	133,295	21,060	248,275
Cash and bank balances	6,029,207	952,572	4,052,957
Held for trading investment	24,714	3,905	12,181
Financial assets	13,262,535	2,095,387	11,425,303
Financial liabilities
Derivative not designated as hedges - foreign exchange forward contract			140
Interest-bearing loans and borrowings	1,652,413	261,069	928,233
Trade and other payables (Note 28)	7,485,109	1,182,594	6,713,240
Other liabilities	79	12	113
Financial liabilities	9,137,601	$ 1,443,675	7,641,726
Liquidity risk [Member] \| One Year or Less [Member]
Financial assets
Trade and bills receivables	7,075,319		7,111,890
Other receivables, excluding tax recoverable	132,675		246,687
Cash and bank balances	6,029,207		4,052,957
Held for trading investment	24,714		12,181
Financial assets	13,261,915		11,423,715
Financial liabilities
Derivative not designated as hedges - foreign exchange forward contract			140
Interest-bearing loans and borrowings	1,624,539		909,824
Trade and other payables (Note 28)	7,328,762		6,576,468
Other liabilities	33		43
Financial liabilities	8,953,334		7,486,475
Liquidity risk [Member] \| Two to Five Years [Member]
Financial assets
Other receivables, excluding tax recoverable	620		1,588
Financial assets	620		1,588
Financial liabilities
Interest-bearing loans and borrowings	27,874		18,409
Trade and other payables (Note 28)	156,347		136,772
Other liabilities	46		70
Financial liabilities	¥ 184,267		¥ 155,251

Cash and bank balances.

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Interest-bearing loans and borrowings.

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The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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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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