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Acquisitions and Divestitures - Additional Information (Detail) $ in Thousands, $ in Millions |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 10, 2017 USD ($) | Jul. 07, 2017 | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Net cash paid |  |  |  | $ 121,664 |  | $ 603 |
Proceeds from issuance of flow-through shares |  |  |  |  | $ 16.6 |  | $ 46.7
Provision |  |  | $ 1,900 | 1,900 |  |  |
Flow-through share premium liability | $ 4,700 |  |  | 0 |  |  |
Acquisition related costs |  |  |  | 4,270 |  |  |
Net loss before tax |  |  |  | $ 792 |  | $ 48,698 |
Integra gold corporation [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Date of acquisition |  |  |  | Jul. 10, 2017 | Jul. 10, 2017 |  |
Description of arrangement for former shareholders |  |  |  | Under the terms of the Arrangement former Integra shareholders were entitled to receive, at their option, for each Integra share they own either (i) 0.2425 Eldorado shares plus C$0.0001 in cash, (ii) C$1.2125 in cash, in both (i) and (ii) subject to pro ration, or (iii) 0.18188 of an Eldorado share and C$0.30313 in cash | Under the terms of the Arrangement former Integra shareholders were entitled to receive, at their option, for each Integra share they own either (i) 0.2425 Eldorado shares plus C$0.0001 in cash, (ii) C$1.2125 in cash, in both (i) and (ii) subject to pro ration, or (iii) 0.18188 of an Eldorado share and C$0.30313 in cash |  |
Number of shares issued | 77,180,898 |  | 77,180,898 | 77,180,898 |  |  |
Fair value of shares issued | $ 188,061 |  | $ 188,061 | $ 188,061 |  |  |
Cash paid | 99,823 |  |  |  |  |  |
Advances as part of consideration | 27,046 |  |  |  |  |  |
Fair value of the existing available-for-sale investment | 41,968 |  | 41,968 | 41,968 |  |  |
Gain on marketable securities | 28,363 |  |  |  |  |  |
Taxes as a reversal of the unrealized gain | $ 4,023 |  |  |  |  |  |
Average foreign exchange rate |  | 0.776 |  |  |  |  |
Goodwill |  |  | 92,591 | 92,591 |  |  |
Goodwill deductible for tax purposes |  |  | 0 | 0 |  |  |
Net cash paid |  |  |  | 121,664 |  |  |
Cash consideration, including advances to Integra |  |  | 126,869 | 126,869 |  |  |
Cash balance |  |  | 5,205 | 5,205 |  |  |
Acquisition related costs |  |  |  | 4,270 |  |  |
Net loss before tax |  |  | $ (5,997) | $ (18,173) |  |  |

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