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Financial Instruments - Summary of Margin over LIBOR Depending on Leverage Ration (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items] |  |  |
Consolidated leverage ratio | 3.85 | 4.22 | 5.21
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 | 3.75 |  |
Top of range [member] | Greater than 5.50x [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Consolidated leverage ratio | 5.50 |  |
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 | 5.00 |  |
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 | 4.50 |  |
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 | 4.00 |  |
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 | 3.50 |  |
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 | 3.00 |  |
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 | 4.50 |  |
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 | 4.00 |  |
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 | 3.50 |  |
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 | 3.00 |  |
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 | 2.50 |  |
Bottom of range [member] | Less than 2.50 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Consolidated leverage ratio | 2.50 |  |

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- 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 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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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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