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Property, Plant and Equipment - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Property, Plant and Equipment [Line Items] |  |  |
Depreciation of property, plant and equipment for continuing operations | $ 594,400,000 | $ 677,300,000 | $ 568,500,000
$70 million senior secured revolving credit facility |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Revolving credit facility, maximum borrowing capacity | 70,000,000 | $ 70,000,000 |
Ghana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Fleet assets pledged | 176,600,000 |  |
Ghana | $70 million senior secured revolving credit facility |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Revolving credit facility, maximum borrowing capacity | $ 70,000,000 |  |

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- Definition Aggregate depreciation, depletion and amortization expense in the current period for the cost of tangible assets, intangible assets, or depleting assets directly related to goods produced and sold during the reporting period. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=55761124&loc=SL6224234-111729 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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