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Construction Contracts - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Construction Contracts          
Billings and contract loss in excess of costs incurred $ 0   $ 0   $ 15,546,000
Costs in excess of billings and contract loss 5,057,000   5,057,000   11,229,000
Construction contract revenue 23,253,000 0 23,253,000 0  
Construction contract costs 23,253,000 0 23,253,000 0  
Century Plant
          
Construction Contracts          
Construction agreement description     The Company constructed the Century Plant for a contract price of $796.3 million, which included agreed upon change orders and scope revisions, that Occidental paid to the Company through periodic cost reimbursements based upon the percentage of the project completed. Upon substantial completion of construction in late 2012, Occidental took ownership and began operating the plant for the purpose of separating and removing CO2 from the delivered natural gas stream.    
Construction contract price         796,300,000
Cumulative loss on construction contracts         180,000,000
Billings and contract loss in excess of costs incurred         15,546,000
Treating agreement contract term     30 years    
Costs in excess of billings and contract loss 2,800,000   2,800,000    
Transmission Expansion Projects
          
Construction Contracts          
Construction agreement description     As of June 30, 2013, the Company had substantially completed the construction of a series of electrical transmission expansion and upgrade projects in northern Oklahoma. The Company constructed these projects for a contract price of $23.3 million, which included agreed upon change orders. With substantial completion of the contract in the second quarter of 2013, the Company recognized construction contract revenue and costs equal to the revised contract price of $23.3 million, which are included in the accompanying unaudited condensed consolidated statements of operations.    
Construction contract price 23,253,000   23,253,000    
Costs in excess of billings and contract loss 2,300,000   2,300,000   11,229,000
Construction contract revenue     23,253,000    
Construction contract costs     $ 23,253,000