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Construction Contracts - Additional Information (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Construction Contracts [Line Items]      
Billings and contract loss in excess of costs incurred $ 0 $ 15,546,000  
Construction contract revenue 23,349,000 796,323,000 0
Construction contract costs 23,349,000 796,323,000 0
Costs in excess of billings and contract loss 4,079,000 11,229,000  
Century Plant
      
Construction Contracts [Line Items]      
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   796,323,000  
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    
Construction contract revenue   796,323,000  
Construction contract costs   796,323,000  
Costs in excess of billings and contract loss 4,079,000    
Transmission Expansion Projects
      
Construction Contracts [Line Items]      
Construction agreement description In the second quarter of 2013, the Company substantially completed the construction of a series of electrical transmission expansion and upgrade projects in northern Oklahoma for a third party. The Company constructed these projects for a contract price of $23.3 million, which included agreed upon change orders.    
Construction contract price 23,349,000    
Construction contract revenue 23,349,000    
Construction contract costs 23,349,000    
Costs in excess of billings and contract loss   $ 11,229,000