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Debt - Summary of Debt (Detail) - Senior notes [member]	12 Months Ended
	Dec. 31, 2017
December 15, 2017 [member]
Disclosure of financial liabilities [line items]
Percentage of principal amount notes redeemed	101.531%
2018 and thereafter [member]
Disclosure of financial liabilities [line items]
Percentage of principal amount notes redeemed	100.00%

X

- Definition

Percentage of principal amount notes redeemed.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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X

- Details

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