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Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Detail) (USD $) | Sep. 30, 2012 | Dec. 31, 2011
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Property, Plant and Equipment [Line Items] |  |  |  |
Proved oil and gas properties | $ 2,004,433,000 | [1] | $ 1,152,532,000 | [1]
Less: Accumulated depreciation, depletion, amortization and impairment | (314,787,000) |  | (174,948,000) |
Proved oil and gas properties, net | 1,689,646,000 |  | 977,584,000 |
Unproved oil and gas properties | 74,583,000 |  | 82,825,000 |
Oil and gas properties, net | 1,764,229,000 |  | 1,060,409,000 |
Other property and equipment | 45,261,000 |  | 20,859,000 |
Less: Accumulated depreciation | (5,691,000) |  | (1,313,000) |
Other property and equipment, net | 39,570,000 |  | 19,546,000 |
Total property, plant and equipment, net | 1,803,799,000 |  | 1,079,955,000 |
Asset retirement costs | 18,500,000 |  | 11,400,000 |
Capitalized interest | $ 5,600,000 |  | $ 3,100,000 |
[1] | Included in the Company's proved oil and gas properties are estimates of future asset retirement costs of $18.5 million and $11.4 million at September 30, 2012 and December 31, 2011, respectively. In addition, the Company's proved oil and gas properties include cumulative capitalized interest of $5.6 million and $3.1 million at September 30, 2012 and December 31, 2011, respectively.

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- Definition Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59M -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Glossary Proved Properties -URI http://asc.fasb.org/extlink&oid=6522428 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Properties -URI http://asc.fasb.org/extlink&oid=21914647 + Details
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- Definition Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 + Details
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