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Summary of Financial Instruments were Denominated in U S Dollars (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 CAD ($)
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |
Cash |  |  | $ 108,772 |  | $ 74,701 |  |
Accounts receivable |  |  | 207,209 |  | 310,204 |  |
Accounts payable and accrued liabilities |  |  | $ (150,957) |  | $ (199,478) |  | $ (2,800)
Canadian Operations [Member] | Currency Risk [Member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |
Cash |  |  |  | $ 35,257 |  | $ 9,727 |
Accounts receivable |  |  |  |  |  | 242 |
Accounts payable and accrued liabilities |  |  |  | (18,727) |  | (17,730) |
Net foreign currency exposure |  |  |  | 16,530 |  | (7,761) |
Impact of $0.01 change in the U.S. dollar to Canadian dollar exchange rate on net earnings (loss) | $ 165 | $ (78) |  |  |  |  |
Foreign Operations [Member] | Currency Risk [Member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |
Cash |  |  |  | 26,057 |  | 41,154 |
Accounts receivable |  |  |  | 98,298 |  | 150,873 |
Accounts payable and accrued liabilities |  |  |  | (59,704) |  | (86,324) |
Long-term liabilities, excluding long-term incentive plans |  |  |  | (16,197) |  | (7,669) |
Net foreign currency exposure |  |  |  | $ 48,454 |  | $ 98,034 |
Impact of $0.01 change in the U.S. dollar to Canadian dollar exchange rate on comprehensive loss | $ 485 | $ 980 |  |  |  |  |

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