XML 67 R68.htm IDEA: XBRL DOCUMENT v2.4.0.6
Construction Contracts - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Construction Contracts [Line Items]    
Billings and estimated contract loss in excess of costs incurred $ 5,798,000 $ 15,546,000
Costs in excess of billings 6,735,000 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   796,300,000
Loss identified based on costs incurred in excess of contract amounts, total   180,000,000
Billings and estimated contract loss in excess of costs incurred 5,798,000 15,546,000
Treating agreement contract term 30 years  
Transmission Expansion Projects
    
Construction Contracts [Line Items]    
Construction agreement description The Company is managing 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 second quarter of 2013.  
Expected construction completion year 2013  
Costs in excess of billings 6,735,000 11,229,000
Transmission Expansion Projects | Maximum
    
Construction Contracts [Line Items]    
Construction contract price $ 23,300,000