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Properties and Equipment, Net (Details 2) (USD $) | 9 Months Ended |  |  | 1 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Undeveloped oil and gas properties | Oct. 31, 2014 Subsequent event Undeveloped oil and gas properties | Oct. 31, 2014 Eagle Ford Shale in South Texas Subsequent event Proved and Unproved oil and gas properties
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Minimum term of capitalization of exploratory well costs | 1 year |  |  |  |  |
Acquisition cost of proved and unproved oil and gas properties |  |  |  |  |  | $ 210,000,000
Total cash consideration paid for proved and unproved oil and gas properties as of closing date |  |  |  |  |  | 186,200,000
Sale of undeveloped oil and gas properties | 3,913,000 | 15,174,000 |  |  | 44,300,000 |
Total cash consideration received from sale of undeveloped oil and gas properties as of closing date |  |  |  |  | 39,900,000 |
Net book value of assets held for sale | $ 5,130,213,000 |  | $ 4,546,227,000 | $ 21,500,000 |  |

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