Annual report pursuant to Section 13 and 15(d)

Assets Held for Sale - Additional Information (Detail)

v2.4.0.8
Assets Held for Sale - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Aircraft [Member]
Dec. 31, 2013
Cheviot Project [Member]
Dec. 31, 2012
Cheviot Project [Member]
Mar. 31, 2013
Cheviot Project [Member]
Long Lived Assets Held-for-sale [Line Items]              
Contract receivables monthly payments         $ 200,000    
Contract receivables monthly payments end date         Feb. 28, 2013    
Amount billed on customers           56,800,000  
Contracts receivable 98,579,000 60,535,000       31,300,000 30,900,000
Provision for loss on contract receivable    14,501,000        14,500,000  
Fair value of assets held for sale         13,500,000    
Assets held for sale       1,000,000      
Loss on sale of aircraft $ 300,000