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Acquisitions and Divestitures - Disclosure Of Detailed Information About Assets And Liabilities Being Distributed To Subsidiaries (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 03, 2018
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Disclosure of detailed information about business combination [line items] |  |  |
Property, plant and equipment | $ 497,944 | $ 316,911 |
Solaris [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Cash |  |  | $ 618
Accounts receivable and prepaid expenses |  |  | 32
Exploration and evaluation assets |  |  | 19,899
Property, plant and equipment |  |  | 48
Accounts payable and accrued liabilities |  |  | (484)
Assets (liabilities) |  |  | $ 20,113

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