Registration of securities issued in business combination transactions

Discontinued Operations (Detail)

v3.6.0.2
Discontinued Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 15, 2016
Mar. 31, 2016
Sep. 17, 2014
Sep. 30, 2016
Mar. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2011
Debt Instrument [Line Items]                
Impairment of proved oil and gas properties             $ 17,400  
Impairment of goodwill             674  
Long-term debt           $ 783    
Future contingent production payments payable               $ 5,000
Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, borrowing limit     $ 8,000          
Long-term debt     $ 5,500          
Prime Rate | Revolving Credit Facility                
Debt Instrument [Line Items]                
Interest rate     3.25%          
Term Loan | Prime Rate | Revolving Credit Facility                
Debt Instrument [Line Items]                
Interest rate     4.75%     3.50%    
Term Loan | Prime Rate | Line of Credit                
Debt Instrument [Line Items]                
Basis spread on variable rate     1.50%          
Nautilus Purchase and Sale Agreement (PSA)                
Debt Instrument [Line Items]                
Future contingent production payments payable               $ 5,000
One Stone Exchange Agreement                
Debt Instrument [Line Items]                
Asset impairment charges   $ 11,300   $ 11,300   $ 11,300    
Impairment of proved oil and gas properties   $ 7,800     $ 7,800      
One Stone Exchange Agreement | Utah CO2 LLC                
Debt Instrument [Line Items]                
Majority interest percentage           51.00%    
Nautilus Poplar, LLC (NP) | One Stone Exchange Agreement                
Debt Instrument [Line Items]                
Ownership percentage, sold in period   100.00%            
CO2 Business                
Debt Instrument [Line Items]                
Ownership percentage, sold in period   100.00%            
Series A Preferred Stock                
Debt Instrument [Line Items]                
Percent of shares transferred   100.00%            
One Stone | One Stone Exchange Agreement | Investor                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.00%              
Disposal Group, including Discontinued Operations, Transaction Costs, Cumulative       968   $ 690    
Transaction costs           278    
One Stone | Nautilus Poplar, LLC (NP) | One Stone Exchange Agreement                
Debt Instrument [Line Items]                
Ownership percentage, sold in period   100.00%            
One Stone | Series A Preferred Stock | One Stone Exchange Agreement                
Debt Instrument [Line Items]                
Percent of shares transferred   100.00%            
Discontinued Operations, Held-for-sale                
Debt Instrument [Line Items]                
Cash       0   141 282  
Discontinued Operations, Held-for-sale | CO2 Business                
Debt Instrument [Line Items]                
Cash       $ 0   141 $ 282  
Collateral           $ 150