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Financial Instruments - Summary of Margin over LIBOR Depending on Leverage Ration (Detail)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	384.00%	385.00%	422.00%
Greater than 5.50x [member]
Disclosure of detailed information about financial instruments [line items]
Applicable margin	3.50%
Less than 5.00 Greater than 4.50 [member]
Disclosure of detailed information about financial instruments [line items]
Applicable margin	3.00%
Less than 4.50 Greater than 4.00 [member]
Disclosure of detailed information about financial instruments [line items]
Applicable margin	2.50%
Less than 4.00 Greater than 3.50 [member]
Disclosure of detailed information about financial instruments [line items]
Applicable margin	2.125%
Less than 3.50 Greater than 3.00 [member]
Disclosure of detailed information about financial instruments [line items]
Applicable margin	1.75%
Less than 3.00 Greater than 2.50 [member]
Disclosure of detailed information about financial instruments [line items]
Applicable margin	1.50%
Less than 2.50 [member]
Disclosure of detailed information about financial instruments [line items]
Applicable margin	1.25%
Top of range [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	375.00%
Top of range [member] | Greater than 5.50x [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	550.00%
Top of range [member] | Less than 5.00 Greater than 4.50 [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	500.00%
Top of range [member] | Less than 4.50 Greater than 4.00 [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	450.00%
Top of range [member] | Less than 4.00 Greater than 3.50 [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	400.00%
Top of range [member] | Less than 3.50 Greater than 3.00 [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	350.00%
Top of range [member] | Less than 3.00 Greater than 2.50 [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	300.00%
Bottom of range [member] | Less than 5.00 Greater than 4.50 [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	450.00%
Bottom of range [member] | Less than 4.50 Greater than 4.00 [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	400.00%
Bottom of range [member] | Less than 4.00 Greater than 3.50 [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	350.00%
Bottom of range [member] | Less than 3.50 Greater than 3.00 [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	300.00%
Bottom of range [member] | Less than 3.00 Greater than 2.50 [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	250.00%
Bottom of range [member] | Less than 2.50 [member]
Disclosure of detailed information about financial instruments [line items]
Consolidated leverage ratio	250.00%

X

- Definition

Leverage ratio.

+ References

No definition available.

+ Details

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X

- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard
-URIDate 2018-03-16

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- 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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