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Capital Management - Additional Information (Detail) $ in Thousands | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($)
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Disclosure Of Capitalisation [Line Items] |  |  |  |
Cash | $ 96,626 |  | $ 65,081 |
Senior Credit Facility [Member] |  |  |  |
Disclosure Of Capitalisation [Line Items] |  |  |  |
Line of credit borrowing capacity |  | $ 500,000,000 |  | $ 500,000,000
Line of credit outstanding |  | 0 |  |
Letters of credit outstanding |  | 28,200,000 |  | 20,900,000
Secured Operating Facility [Member] |  |  |  |
Disclosure Of Capitalisation [Line Items] |  |  |  |
Line of credit borrowing capacity | 101,400 |  | 96,600 |
40.0 Million Secured Operating Facilities [Member] |  |  |  |
Disclosure Of Capitalisation [Line Items] |  |  |  |
Line of credit borrowing capacity | 40,000 |  | 40,000 |
Letters of credit outstanding | $ 27,800 |  | $ 20,800 |
30.0 Million Operating Facilities [member] |  |  |  |
Disclosure Of Capitalisation [Line Items] |  |  |  |
Line of credit borrowing capacity |  | 30,000,000 |  | 30,000,000
Letters of credit outstanding |  | 2,100,000 |  | 13,300,000
15.0 Million Secured Operating Facilities [Member] |  |  |  |
Disclosure Of Capitalisation [Line Items] |  |  |  |
Line of credit borrowing capacity |  | 15,000,000 |  | 15,000,000
Line of credit outstanding |  | $ 0 |  | $ 0

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