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Financial Instruments - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CAD | Dec. 31, 2016 CAD | May 06, 2016 CAD
Disclosure of detailed information about financial instruments [line items] |  |  |
Maximum amount of credit risk exposure | CAD 1,252,600,000 | CAD 1,203,500,000 |
Number of target days of revenue in trade receivables | 55 days | 57 days |
Amount of revolving credit facility |  |  | CAD 1,250,000,000
0.5% Increase in interest rates [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Impact on net income | CAD 2,500,000 |  |
0.5% Decrease in interest rates [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Impact on net income | 2,500,000 |  |
1.0% Increase in equity price risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Equity price impact on comprehensive income | 400,000 |  |
1.0% Decrease in equity Price risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Equity price impact on comprehensive income | CAD 400,000 |  |
Top of range [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Net debt to EBITDA ratio | 2.5 |  |
Top of range [member] | One point zero percentage decrease in exchange rates [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Impact on net income | CAD 200,000 |  |
Top of range [member] | One point zero percentage increase in exchange rates [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Impact on net income | 200,000 |  |
Revolving credit facilities [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Amount of revolving credit facility | 800,000,000 |  | CAD 800,000,000
Unused capacity amount | CAD 538,300,000 | CAD 329,200,000 |

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35K_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_36_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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