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Financial Instruments - Summary of Fair Value of Financial Assets and Financial Liabilities (Parenthetical) (Detail) - Dec. 31, 2017 € in Thousands, $ in Thousands | USD ($) | EUR (€)
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Participating cross currency swap contracts [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | $ 238,400 | € 184,900
Currency and interest swap contracts [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | $ 298,611 | 43,585
Currency and interest swap contracts [member] | Currency and interest swap contracts three [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value |  | 100,000
Currency and interest swap contracts [member] | Currency and interest swap contracts four [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value |  | 150,000
Currency and interest swap contracts [member] | Currency and interest swap contracts five [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value |  | € 250,000

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