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Asset Retirement Obligations - Summary of Asset Retirement Obligations (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of asset retirement obligations [line items] |  |
Beginning Balance | $ 89,778 |
Acquired during the year | 9,453 |
Accretion during the year | 2,006 |
Revisions to estimate of obligation | 1,544 |
Settlements | (3,097) |
Ending Balance | 99,684 |
Less: Current portion | (3,489) |
Long term portion | 96,195 | $ 89,778
Estimated undiscounted amount | 139,591 |
Greece [member] |  |
Disclosure of asset retirement obligations [line items] |  |
Beginning Balance | 48,131 |
Accretion during the year | 1,025 |
Revisions to estimate of obligation | 1,112 |
Settlements | (2,807) |
Ending Balance | 47,461 |
Less: Current portion | (3,489) |
Long term portion | 43,972 |
Estimated undiscounted amount | 71,591 |
Brazil [member] |  |
Disclosure of asset retirement obligations [line items] |  |
Beginning Balance | 4,092 |
Accretion during the year | 32 |
Revisions to estimate of obligation | (80) |
Ending Balance | 4,044 |
Long term portion | 4,044 |
Estimated undiscounted amount | 4,117 |
Turkey [member] |  |
Disclosure of asset retirement obligations [line items] |  |
Beginning Balance | 36,196 |
Accretion during the year | 913 |
Revisions to estimate of obligation | 502 |
Settlements | (290) |
Ending Balance | 37,321 |
Long term portion | 37,321 |
Estimated undiscounted amount | 49,257 |
Romania [member] |  |
Disclosure of asset retirement obligations [line items] |  |
Beginning Balance | 1,359 |
Accretion during the year | 36 |
Revisions to estimate of obligation | 10 |
Ending Balance | 1,405 |
Long term portion | 1,405 |
Estimated undiscounted amount | 2,340 |
Canada [member] |  |
Disclosure of asset retirement obligations [line items] |  |
Acquired during the year | 9,453 |
Ending Balance | 9,453 |
Long term portion | 9,453 |
Estimated undiscounted amount | $ 12,286 |

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- Definition Asset retirement obligations, accretion expense during the year. + References No definition available. + Details
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