Debt (Unamortized Debt Issuance Costs) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 21, 2017
 [2]
Dec. 31, 2016
Dec. 31, 2015
Unamortized debt issuance costs        
Total unamortized debt issuance costs [1] $ 1,649      
New Revolver        
Unamortized debt issuance costs        
Total unamortized debt issuance costs $ 1,649 $ 1,125    
Predecessor        
Unamortized debt issuance costs        
Total unamortized debt issuance costs [1]     $ 2,303 $ 23,426
Predecessor | 9.875% Senior Notes due 2020        
Unamortized debt issuance costs        
Total unamortized debt issuance costs       4,078
Predecessor | 8.25% Senior Notes due 2021        
Unamortized debt issuance costs        
Total unamortized debt issuance costs       5,459
Predecessor | 7.625% Senior Notes due 2022        
Unamortized debt issuance costs        
Total unamortized debt issuance costs       8,822
Predecessor | Prior Credit Facility        
Unamortized debt issuance costs        
Total unamortized debt issuance costs     $ 2,303 $ 5,067
[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.