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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)