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Construction Contracts - Additional Information (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Construction Contracts [Line Items] |  |  |
Estimated loss identified based on projections of the costs to be incurred in excess of contract amounts, during period | $ (50,000,000) | $ (25,000,000) | $ (105,000,000)
Billings and estimated contract loss in excess of costs incurred | 15,546,000 | 43,320,000 |
Century Plant |  |  |
Construction Contracts [Line Items] |  |  |
Construction agreement description | The Company has substantially completed construction of the Century Plant and associated compression and pipeline facilities pursuant to an agreement with Occidental. Under the terms of the agreement, the Company constructed the Century Plant for a contract price of $796.3 million, including subsequently agreed upon change orders and scope revisions, payable through periodic cost reimbursements based upon the percentage of the project completed by the Company. During 2012, both phases of construction were substantially completed and Occidental took ownership and began operating the plant for the purpose of separating and removing CO2 from the delivered natural gas stream. With the completion of the contract, the Company recorded construction contract revenue and construction contract costs equal to the revised contract price of $796.3 million, which are included in the accompanying consolidated statements of operations. |  |
Construction contract price | 796,300,000 |  |
Estimated loss identified based on projections of the costs to be incurred in excess of contract amounts, total | 180,000,000 |  |
Estimated loss identified based on projections of the costs to be incurred in excess of contract amounts, during period | (50,000,000) | (25,000,000) |
Billings and estimated contract loss in excess of costs incurred | 15,546,000 | 43,320,000 |
Treating agreement contract term | 30 years |  |
Transmission Expansion Projects |  |  |
Construction Contracts [Line Items] |  |  |
Construction agreement description | The Company entered into a construction services agreement in November 2011 to manage the design, engineering and construction of a series of transmission expansion and upgrade projects in northern Oklahoma. Under the terms of the agreement, the Company will be reimbursed for costs incurred on these projects up to approximately $23.3 million, plus any subsequently agreed-upon revisions. Construction on these projects began in 2012 with the final project expected to be completed in the first quarter of 2013. |  |
Expected construction completion year | 2013 |  |
Costs in excess of billings | 11,200,000 | 0 |
Transmission Expansion Projects | Maximum |  |  |
Construction Contracts [Line Items] |  |  |
Construction contract price | $ 23,300,000 |  |

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- Definition Liabilities due to billings and provisions for contract losses on long term contracts that exceed the income recorded under the percentage of completion contract accounting method, or that exceed the accumulated costs under the completed contract accounting method. + References No definition available. + Details
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- Details
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- Definition Contract price per construction agreement. + References No definition available. + Details
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- Definition Amount included in cost of uncompleted contracts in excess of related billings and provisions for contract losses, or unbilled accounts receivable, which is expected to be collected within one year (or one operating cycle, if longer) from the date of the balance sheet. + References No definition available. + Details
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- Definition Treating Agreement Contract Term + References No definition available. + Details
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- Definition Losses recognized in the current period on contracts which are expected to generate losses, which are probable and can be reasonably estimated, in a future period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 -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. + Details
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