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Bank Indebtedness - Additional Information (Detail) | 12 Months Ended |  |
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Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($)
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Description of interest rate | Advances under the $40.0 million facility are available at the bank’s prime lending rate, U.S. base rate, U.S. LIBOR plus applicable margin, or Banker’s Acceptance plus applicable margin, or in combination, and under the US$15.0 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 | $ 20,800,000 |  | $ 22,000,000 |
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 |  | $ 13,300,000 |  | $ 6,500,000

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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 2016-01-13 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard -URIDate 2016-03-31 + Details
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