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Financial Instruments - Summary of Group's Exposure to Foreign Currency Risk Based on Notional Amounts (Detail) - Currency risk [member] € in Thousands, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 EUR (€)
Disclosure of Risks [line items]
Financial assets	$ 875,005			$ 751,289		€ 463,194		€ 333,117
Financial liabilities	(2,158,758)			(1,676,261)		(1,337,026)	¥ (324,316)	(1,276,292)
Net exposure	(201,717)	€ (62,665)	¥ (121,716)	62,039	€ (194,525)
Other noncurrent assets [member]
Disclosure of Risks [line items]
Financial assets	222			72		11		2,681
Financial assets at fair value through other comprehensive income [member]
Disclosure of Risks [line items]
Financial assets | €						7,043
Due from related parties-short term [member]
Disclosure of Risks [line items]
Financial assets	1,965			571		223		407
Trade receivables and contract assets [member]
Disclosure of Risks [line items]
Financial assets	15,786					52,140
Other current assets [member]
Disclosure of Risks [line items]
Financial assets	70,710			43,039		18,977		35,049
Cash and cash equivalents [member]
Disclosure of Risks [line items]
Financial assets	786,322			688,717		384,800		237,697
Loans and borrowings-long term [member]
Disclosure of Risks [line items]
Financial liabilities	(481,438)			(557,180)		(748,142)	(224,519)	(960,629)
Debt securities issued-non-current [member]
Disclosure of Risks [line items]
Financial liabilities	(921,102)			(469,387)
Lease Obligations [member]
Disclosure of Risks [line items]
Financial liabilities	(4,719)					(24,068)
Other non current liabilities [member]
Disclosure of Risks [line items]
Financial liabilities	(68,107)			(85,816)
Loans and borrowings-short term [member]
Disclosure of Risks [line items]
Financial liabilities	(390,876)			(206,535)		(523,595)	(29,244)	(285,827)
debt securities issued-current [member]
Disclosure of Risks [line items]
Financial liabilities	(55,074)			(27,848)
Rent lease obligations current [member]
Disclosure of Risks [line items]
Financial liabilities	(2,951)					(8,223)
Trade and other payables-current [member]
Disclosure of Risks [line items]
Financial liabilities	(233,805)			(328,323)		(32,946)	¥ (70,553)	(29,442)
Due to related parties [member]
Disclosure of Risks [line items]
Financial liabilities	(686)			(1,172)		€ (52)		(394)
Participating cross currency swap and FX swap contracts [member]
Disclosure of Risks [line items]
Net exposure	$ 1,082,036	€ 811,167	¥ 202,600	937,011	€ 748,650
Trade receivables and accrued income [member]
Disclosure of Risks [line items]
Financial assets				18,890				€ 57,283
Currency forward contracts [member]
Disclosure of Risks [line items]
Net exposure				$ 50,000

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- Definition

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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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) 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 deliver 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, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are 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. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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