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Debt - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Feb. 24, 2016
Jul. 06, 2015
Jun. 26, 2013
Dec. 31, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 02, 2018
Aug. 01, 2017
Feb. 24, 2017
Feb. 23, 2017
Jul. 13, 2015
Mar. 31, 2014
Debt Instrument [Line Items]                          
Debt instrument interest rate         8.875%                
Gain (loss) on early extinguishment of debt           $ 14,489,000 $ (59,392,000)            
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         $ 33,600,000                
Revolving Credit Facility [Member]                          
Debt Instrument [Line Items]                          
Revolving credit facility                         $ 500,000,000
Credit facility maturity year         2018                
Applicable Margin 0.50%                        
Percentage of additional mortgage to be delivered 90.00%                        
Additional Period for the effectiveness of amendment 60 days                        
Borrowing base         $ 225,000,000       $ 225,000,000 $ 175,000,000 $ 125,000,000    
Revolving credit facility, extended maturity month and year         2020-02                
Available capacity on the Revolving Credit Facility         $ 191,400,000                
Commitment fees on unused portion of revolving credit facility         0.50%                
Revolving Credit Facility [Member] | Subsequent Event [Member]                          
Debt Instrument [Line Items]                          
Borrowing base               $ 45,000,000          
Available capacity on the Revolving Credit Facility               $ 146,400,000          
12.0% Senior Unsecured PIK Notes Due 2018 [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, outstanding principal balance amount     $ 300,000,000 $ 100,000,000               $ 437,300,000  
Debt instrument interest rate     12.00%                 12.00%  
Notes issued percentage price     96.00%                    
Proceeds from debt instrument     $ 280,700,000 100,000,000                  
Debt discount     12,000,000 0                  
Offering expenses     7,300,000 $ 200,000                  
Debt instrument repurchase amount   $ 510,700,000                   $ 510,700,000  
Debt instrument, premium amount                       47,600,000  
Debt instrument, accrued interest amount                       $ 25,800,000  
Debt instrument, unamortized discount and deferred financing costs         $ 11,800,000                
Gain (loss) on early extinguishment of debt         (59,400,000)                
Amortization of deferred financing costs and debt discount             1,900,000            
12.0% Senior Unsecured PIK Notes Due 2018 [Member] | Additional Notes Option [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, outstanding principal balance amount     $ 100,000,000                    
8.875% Senior Unsecured Notes Due 2023 [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, outstanding principal balance amount   $ 550,000,000                      
Debt instrument interest rate   8.875%                      
Notes issued percentage price   97.903%                      
Gain (loss) on early extinguishment of debt           14,500,000              
Amortization of deferred financing costs and debt discount         $ 3,400,000 3,300,000 $ 1,500,000            
Issuance date   Jul. 06, 2015                      
Debt instrument maturity year         2023                
Debt instrument, proceeds   $ 525,500,000                      
Principal amount outstanding           39,500,000              
Debt instrument, fair value         $ 524,100                
8.875% Senior Unsecured Notes Due 2023 [Member] | Open Market [Member]                          
Debt Instrument [Line Items]                          
Debt instrument repurchase amount           $ 23,400,000