Fresh Start Accounting - Consolidated Balance Sheet (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 21, 2017
Mar. 21, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fresh Start Adjustment [Line Items]              
Total liabilities subject to compromise $ 0            
Fair value of equity issued in settlement of Senior Notes and certain general unsecured creditors   $ (948,944) $ (948,944)        
Total issuance costs on New Credit Facility [1] 1,649            
Long-term debt and capital leases, less current maturities 288,991 291,429 291,429        
Cancellation of predecessor equity - par value   450 450        
Cancellation of predecessor equity - paid in capital 948,613 948,613 948,613        
Professional fees 620            
Total reorganization items 620            
Long-term debt and capital leases, classified as current 4,588 4,632 4,632        
Predecessor              
Fresh Start Adjustment [Line Items]              
Senior Notes including interest   1,267,410 1,267,410   $ 1,267,410    
Accounts payable and accrued liabilities   6,687 6,687   9,212    
Accrued payroll and benefits payable   3,949 3,949   4,048    
Revenue distribution payable   3,050 3,050   3,474    
Total liabilities subject to compromise   1,281,096 1,281,096   1,284,144    
Total issuance costs on New Credit Facility [1]         2,303 $ 23,426  
Origination of the New Term Loan, net of current portion         444,440 367,000  
Long-term debt and capital leases, less current maturities         0    
Cancellation of predecessor equity - par value   14 14        
Cancellation of predecessor equity - paid in capital   425,425 425,425   425,231 431,307  
Gain on settlement of liabilities subject to compromise     (372,093)        
Fresh start accounting adjustments     (641,684)        
Professional fees     18,790   15,484    
Rejection of employment contracts     4,573        
Write off unamortized issuance costs on Prior Credit Facility     1,687        
Total reorganization items     (988,727) $ 0 16,720 0 $ 0
Long-term debt and capital leases, classified as current   $ 468,814 468,814   $ 469,112 $ 1,583,701  
Predecessor | Common Stock              
Fresh Start Adjustment [Line Items]              
Common stock shares issued   45,000,000          
New Term Loan              
Fresh Start Adjustment [Line Items]              
New credit facility, opening balance 149,255 $ 149,250 [2] 149,250 [2]        
New Revolver              
Fresh Start Adjustment [Line Items]              
Total issuance costs on New Credit Facility 1,649 1,125 [2] 1,125 [2]        
New credit facility, opening balance $ 120,000 120,000 120,000        
Reorganization Adjustments              
Fresh Start Adjustment [Line Items]              
Cash proceeds from rights offering   50,031          
Senior Notes including interest   1,267,410 1,267,410        
Accounts payable and accrued liabilities   6,687 6,687        
Accrued payroll and benefits payable   3,949 3,949        
Payment in full to extinguish Prior Credit Facility   (444,440) (444,440)        
Revenue distribution payable   3,050 3,050        
Payment of accrued interest on Prior Credit Facility   (2,095)          
Total liabilities subject to compromise   1,281,096 1,281,096        
Payment of previously accrued creditor-related professional fees   (6,954)          
Amounts settled in cash, reinstated or otherwise reserved at emergence   (10,089) (10,089)        
Net cash used   (135,333)          
Fair value of equity issued in settlement of Senior Notes and certain general unsecured creditors   (898,914) (898,914)        
Total issuance costs on New Credit Facility   2,410 2,410        
Reclassification from current to noncurrent, based on scheduled repayment, of debt no longer in default   22,612 22,612        
Long-term debt and capital leases, less current maturities   291,429 291,429        
Cancellation of predecessor equity - par value   450 450        
Cancellation of predecessor equity - paid in capital   948,613 948,613        
Issuance of successor common stock in settlement of claims   898,914 898,914        
Issuance of successor common stock under rights offering   50,031 50,031        
Issuance of warrants   118 118        
Net impact to common stock-par and additional paid in capital   523,624 523,624        
Gain on settlement of liabilities subject to compromise   372,093          
Cancellation of predecessor equity   425,438          
Write off unamortized issuance costs on Prior Credit Facility   (1,687) 1,687        
Net impact to retained earnings   795,844 795,844        
Long-term debt and capital leases, classified as current   $ (464,182) $ (464,182)        
Reorganization Adjustments | Common Stock              
Fresh Start Adjustment [Line Items]              
Common stock shares issued   44,982,142          
Warrants issued for purchase of common stock   140,023 140,023        
Reorganization Adjustments | Predecessor              
Fresh Start Adjustment [Line Items]              
Cancellation of predecessor equity - par value   $ (14) $ (14)        
Cancellation of predecessor equity - paid in capital   (425,425) (425,425)        
Reorganization Adjustments | New Term Loan              
Fresh Start Adjustment [Line Items]              
Cash proceeds   150,000          
Fees paid to lender   (750)          
Total issuance costs on New Credit Facility   750 750        
Establishment of New Term Loan - current portion   1,183 1,183        
Reorganization Adjustments | New Revolver              
Fresh Start Adjustment [Line Items]              
Cash proceeds   120,000          
Fees paid to lender   (1,125)          
Total issuance costs on New Credit Facility   1,125 1,125        
Reorganization Adjustments | New Credit Facility | New Term Loan              
Fresh Start Adjustment [Line Items]              
Origination of the New Term Loan, net of current portion   148,817 148,817        
Reorganization Adjustments | New Credit Facility | New Revolver              
Fresh Start Adjustment [Line Items]              
New credit facility, opening balance   120,000 120,000        
Reorganization Adjustments | New Credit Facility              
Fresh Start Adjustment [Line Items]              
Total issuance costs on New Credit Facility   $ 535 $ 535        
[1] Debt issuance costs are presented as a direct deduction from debt rather than an asset pursuant to recent accounting guidance. See table below.
[2] Upfront fees of 0.5% were paid to the lenders under the New Credit Facility. The amount paid in connection with the New Term Loan is reflected as a discount on the loan and will be amortized under the effective interest method. The amount paid in connection with the New Revolver will be reflected as a reduction to the liability whenever outstanding borrowings exceed the remaining unamortized issuance costs, otherwise such amount will be reflected as an asset. The issuance cost related to the New Revolver will be amortized ratably over the life of the facility.