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Property, Pland and Equipment - Additional Information (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Property, Plant and Equipment |  |  |  |
Impairment | $ 687,000 | $ 0 | $ 16,330,000 | $ 0
Drilling Assets |  |  |  |
Property, Plant and Equipment |  |  |  |
Impairment | 500,000 |  | 11,100,000 |
Assets held-for-sale | 6,200,000 |  | 6,200,000 |
Corporate Asset |  |  |  |
Property, Plant and Equipment |  |  |  |
Impairment |  |  | 2,900,000 |
Assets held-for-sale | 17,000,000 |  | 17,000,000 |
Midstream Pipe Inventory and Natural Gas Compressors |  |  |  |
Property, Plant and Equipment |  |  |  |
Impairment | $ 200,000 |  | $ 2,300,000 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Current assets (normally turning over within one year or one business cycle if longer) that are held for sale apart from normal operations and anticipated to be sold within one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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