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Debt - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Oct. 09, 2020
May 04, 2020
Jul. 06, 2015
Jun. 30, 2020
Sep. 30, 2020
May 03, 2020
Dec. 31, 2019
Debt Instrument [Line Items]              
Debt instrument, covenant description         The indenture governing the senior unsecured notes contains covenants that, among other things, limit the ability of the Company and its restricted subsidiaries to: (i) incur additional indebtedness, (ii) pay dividends on capital stock or redeem, repurchase or retire the Company’s capital stock or subordinated indebtedness, (iii) transfer or sell assets, (iv) make investments, (v) create certain liens, (vi) enter into agreements that restrict dividends or other payments to the Company from its restricted subsidiaries, (vii) consolidate, merge or transfer all or substantially all of the assets of the Company and its restricted subsidiaries, taken as a whole, (viii) engage in transactions with affiliates, and (ix) create unrestricted subsidiaries.    
Outstanding letters of credit         $ 29,200,000    
Wrote off unamortized deferred financing costs       $ 200,000      
Outstanding notes payable         $ 800,000   $ 300,000
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Percentage of company's proved reserves and guarantees secured by mortgages         85.00%    
Borrowing base   $ 475,000,000     $ 475,000,000 $ 500,000,000  
Outstanding borrowings         170,000,000.0    
Available capacity on the Revolving Credit Facility         $ 275,800,000    
Applicable margin   0.25%          
Reduced borrowing base   $ (25,000,000)          
Prepayment requirements on cash balances   40,000,000          
Wrote off unamortized deferred financing costs   $ 200,000          
Revolving Credit Facility [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Commitment fees on unused portion of revolving credit facility         0.375%    
Revolving Credit Facility [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Commitment fees on unused portion of revolving credit facility         0.50%    
8.875% Senior Unsecured Notes Due 2023 [Member]              
Debt Instrument [Line Items]              
Issuance date     Jul. 06, 2015        
Debt instrument, outstanding principal balance amount     $ 550,000,000        
Debt instrument interest rate     8.875%   8.875%    
Debt instrument maturity year     2023        
Notes issued percentage price     97.903%        
Debt instrument, proceeds     $ 525,500,000        
8.875% Senior Unsecured Notes Due 2023 [Member] | Level 2 [Member]              
Debt Instrument [Line Items]              
Fair value of senior unsecured notes         $ 519,000,000.0    
8.875% Senior Unsecured Notes Due 2023 [Member] | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Debt instrument, redemption description On October 6, 2020, the Company notified the trustee under the indenture that the Company had elected to redeem, subject to certain conditions (the “Redemption”), all of its outstanding senior unsecured notes. On October 9, 2020, the Company issued a conditional notice of full redemption to redeem all of its outstanding senior unsecured notes. The anticipated redemption date is November 13, 2020 (the “Redemption Date”). The redemption price for the senior unsecured notes will be 102.219% (the “Redemption Price”) of the aggregate principal amount being redeemed, plus accrued but unpaid interest on the senior unsecured notes redeemed to, but not including, the Redemption Date. Upon the Redemption by the Company of the senior unsecured notes, none of the senior unsecured notes will remain outstanding.            
Debt instrument, anticipated redemption date Nov. 13, 2020            
Debt instrument, redemption price, percentage 102.219%            
Senior PIK Notes [Member]              
Debt Instrument [Line Items]              
Debt instrument repurchase amount     $ 510,700,000