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Summary of Financial Instruments were Denominated in U S Dollars (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CAD ($)
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |
Cash |  |  | $ 65,081 |  | $ 115,705 |  | $ 444,759
Accounts receivable |  |  | 322,585 |  | 293,682 |  |
Accounts payable and accrued liabilities |  |  | $ (209,625) |  | $ (240,736) |  |
Canadian Operations [Member] | Currency Risk [Member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |
Cash |  |  |  | $ 1,720 |  | $ 37,583 |
Accounts payable and accrued liabilities |  |  |  | (13,221) |  | (20,054) |
Net foreign currency exposure |  |  |  | (11,501) |  | 17,529 |
Impact of $0.01 change in the U.S. dollar to Canadian dollar exchange rate on net loss | $ (115) | $ 175 |  |  |  |  |
Foreign Operations [Member] | Currency Risk [Member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |
Cash |  |  |  | 39,636 |  | 45,800 |
Accounts receivable |  |  |  | 152,216 |  | 144,302 |
Accounts payable and accrued liabilities |  |  |  | (98,008) |  | (106,635) |
Long-term liabilities, excluding long-term incentive plans |  |  |  | (8,023) |  | (9,251) |
Net foreign currency exposure |  |  |  | $ 85,821 |  | $ 74,216 |
Impact of $0.01 change in the U.S. dollar to Canadian dollar exchange rate on comprehensive loss | $ 858 | $ 742 |  |  |  |  |

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