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Bank Indebtedness - Additional Information (Detail) | 12 Months Ended |  |
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Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($)
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Description of interest rate | Advances under the $40 million facility are available at the bank’s prime lending rate, U.S. base rate, U.S. LIBOR rate plus 80% of applicable margin, or 80% of the applicable margin for Banker’s Acceptances, or in combination, and under the US$15 million facility at the bank’s prime lending rate |  |  |
40.0 Million Secured Operating Facilities [Member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Line of credit borrowing capacity | $ 40,000,000 |  | $ 40,000,000 |
Line of credit outstanding | 0 |  | 0 |
Letters of credit outstanding | $ 26,000,000 |  | $ 28,000,000 |
15.0 Million Secured Operating Facilities [Member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Line of credit borrowing capacity |  | $ 15,000,000 |  | $ 15,000,000
Line of credit outstanding |  | 0 |  | 0
30.0 Million Operating Facilities [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Line of credit borrowing capacity |  | 30,000,000 |  | 30,000,000
Line of credit outstanding |  | 0 |  | 0
Letters of credit outstanding |  | $ 2,000,000 |  | $ 2,000,000

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- Definition The amount of loans received from banks that have been secured by collateral. [Refer: Loans received] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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