Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Additional Information (Detail)

v3.6.0.2
Long-Term Debt - Additional Information (Detail)
4 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 12, 2016
USD ($)
Sep. 30, 2016
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Disclosure [Line Items]            
Interest on borrowings and related fees 1 $ 678,000 $ 36,012,000     $ 92,490,000 $ 91,866,000
Amortization of debt issuance costs 2 226,000 22,189,000     4,749,000 4,197,000
Interest Paid, Capitalized (25,000) (183,000)     (6,288,000) (7,232,000)
Interest Expense $ 879,000 58,018,000     $ 90,951,000 $ 88,831,000
Maximum borrowing capacity   128,000,000        
Required covenant, current ratio 1.00     1.00    
Interest Coverage Ratio, Maximum 3.00     3.00    
Revolving Credit Facility [Member]            
Debt Disclosure [Line Items]            
Maximum borrowing capacity   $ 200,000,000        
Revolving Credit Facility [Member] | Minimum            
Debt Disclosure [Line Items]            
Credit facility interest rate option one, applicable margin rate over Adjusted LIBOR 2.00%          
Revolving Credit Facility [Member] | Maximum            
Debt Disclosure [Line Items]            
Credit facility interest rate option one, applicable margin rate over Adjusted LIBOR 3.00%          
Credit facility interest rate option two, applicable margin rate   4.00%        
Revolving Credit Facility [Member] | Future Period [Member]            
Debt Disclosure [Line Items]            
Required covenant, debt to EBITDAX ratio 4.00     4.00    
Revolving Credit Facility [Member] | Future Period Two [Member]            
Debt Disclosure [Line Items]            
Required covenant, debt to EBITDAX ratio 3.75     3.75    
Revolving Credit Facility [Member] | through maturity            
Debt Disclosure [Line Items]            
Required covenant, debt to EBITDAX ratio 3.50     3.50    
Revolving credit facility            
Debt Disclosure [Line Items]            
Letter of credit amount outstanding $ 800,000     $ 800,000    
Line of Credit Facility, Interest Rate at Period End 3.67%     3.67%    
Commitment fees for undrawn credit facility       0.50%    
Revolving credit facility | Letter of Credit            
Debt Disclosure [Line Items]            
Maximum borrowing capacity $ 5,000,000     $ 5,000,000    
Interest Payable One [Member] | Revolving Credit Facility [Member]            
Debt Disclosure [Line Items]            
Debt Instrument, Interest Payable Period     1 month      
Interest Payable Two [Member] | Revolving Credit Facility [Member]            
Debt Disclosure [Line Items]            
Debt Instrument, Interest Payable Period     3 months      
Interest Payable Three [Member] | Revolving Credit Facility [Member]            
Debt Disclosure [Line Items]            
Debt Instrument, Interest Payable Period     6 months