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Financial Instruments - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Jun. 27, 2018 CAD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Maximum amount of credit risk exposure | $ 1,681,300,000 | $ 1,667,400,000 |
Number of target days of revenue in trade receivables | 66 days | 55 days |
Write off of trade receivables | $ 800,000 |  |
Trade and other receivables | 1,500,000 | $ 2,100,000 |
Trade and unbilled receivables [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Trade and other receivables | 1,500,000 |  |
Contract assets and holdbacks [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Trade and other receivables | 400,000 |  |
0.5% Increase in interest rates [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Equity price impact on comprehensive income | 3,200,000 |  |
0.5% Decrease in interest rates [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Equity price impact on comprehensive income | 3,200,000 |  |
1.0% Increase in equity price risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Equity price impact on comprehensive income | 300,000 |  |
1.0% Decrease in equity Price risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Equity price impact on comprehensive income | $ 300,000 |  |
Top of range [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Net debt to EBITDA ratio | 2.5 |  |
Revolving credit facilities [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Amount of revolving credit facility | $ 800,000,000 |  | $ 800,000,000
Unused capacity amount | $ 223,400,000 | $ 538,300,000 |

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b -URIDate 2018-03-16 + 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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- 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 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35K_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -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 2018-03-16 + Details
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