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Property, Plant and Equipment - Additional Information (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 23, 2015 CAD ($) | Jul. 23, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Property, plant and equipment [abstract] |  |  |  |  |  |  |
Impairment |  |  | $ 0 | $ 0 |  | $ 21,200,000 | $ 12,200,000
Deposit on anticipated sale of real property | $ 15 | $ 11,200,000 |  |  | $ 0 | $ 0 | $ 11,200,000

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- Definition Proceeds From Sale of Property, Related Party Transactions + References No definition available. + Details
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- References No definition available. + Details
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