Debt (Premiums, Discounts and Debt Issuance Costs) (Detail) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
Mar. 31, 2017 |
Mar. 21, 2017 |
Mar. 31, 2016 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Debt Instrument [Line Items] | ||||||
| Total | $ 0 | $ 16,970 | ||||
| Predecessor | ||||||
| Debt Instrument [Line Items] | ||||||
| Non-cash expense for write-off of debt issuance costs on Senior Notes | 17,756 | $ 17,756 | ||||
| Non-cash expense for write-off of debt discount costs on Senior Notes | 4,014 | 4,014 | ||||
| Non-cash gain for write-off of debt premium on Senior Notes | (4,800) | (4,800) | ||||
| Total | $ 0 | $ 16,970 | $ 16,970 | $ 0 | $ 0 | |