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Summary of Financial Instruments were Denominated in U S Dollars (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($)
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Cash |  |  | $ 96,626 |  | $ 65,081 |
Accounts receivable |  |  | 372,336 |  | 322,585 |
Accounts payable and accrued liabilities |  |  | $ (274,489) |  | $ (209,625) |
Canadian Operations [Member] | Currency Risk [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Cash |  |  |  | $ 957 |  | $ 1,720
Accounts receivable |  |  |  | 482 |  |
Accounts payable and accrued liabilities |  |  |  | (20,655) |  | (13,221)
Net foreign currency exposure |  |  |  | (19,216) |  | (11,501)
Impact of $0.01 change in the U.S. dollar to Canadian dollar exchange rate on net loss | $ (192) | $ (115) |  |  |  |
Foreign Operations [Member] | Currency Risk [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Cash |  |  |  | 49,302 |  | 39,636
Accounts receivable |  |  |  | 181,609 |  | 152,216
Accounts payable and accrued liabilities |  |  |  | (122,417) |  | (98,008)
Long-term liabilities, excluding long-term incentive plans |  |  |  | (7,747) |  | (8,023)
Net foreign currency exposure |  |  |  | $ 100,747 |  | $ 85,821
Impact of $0.01 change in the U.S. dollar to Canadian dollar exchange rate on comprehensive loss | $ 1,007 | $ 858 |  |  |  |

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