Daily volume weighted average price.

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Debt restructuring costs.

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Gain (losses) on conversion of debt.

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Long term debt principal amount.

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Maximum accrued interest payable in kind.

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Maximum notes issuable for toggle interest paid in kind.

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The number of warrants issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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Face (par) amount of the original debt instrument that was repurchased.

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Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Long-Term Debt - Additional Information (Detail) - USD ($)		3 Months Ended								8 Months Ended	12 Months Ended
	Sep. 06, 2016	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 05, 2016	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Principal		$ 1,165,433,000									$ 1,165,433,000
Gain on extinguishment of debt		(1,064,000)	$ 100,540,000	$ 56,196,000	$ 33,380,000	$ 23,155,000	$ 51,054,000	$ 7,267,000	$ (2,735,000)		189,052,000	$ 78,741,000
Unamortized debt issuance costs		$ 16,183,000				$ 19,670,000					$ 16,183,000	19,670,000
Loss from write-off of deferred loan costs												$ 3,700,000
10 % Senior Secured Toggle Notes due 2020
Debt Instrument [Line Items]
Interest rate on senior notes		10.00%				10.00%					10.00%	10.00%
Principal		$ 697,195,000									$ 697,195,000
Interest payment terms											payable on March 15 and September 15, and the notes mature on March 15, 2020
Maturity of senior notes											Mar. 15, 2020
Accrued interest by issuing additional notes											$ 75,000,000
Interest rate on senior notes, payment in kind											12.25%
Additional notes outstanding		$ 91,900,000									$ 91,900,000
10 % Senior Secured Notes due 2020
Debt Instrument [Line Items]
Interest rate on senior notes		10.00%				10.00%					10.00%	10.00%
Principal	$ 2,800,000	$ 2,805,000				$ 700,000,000					$ 2,805,000	$ 700,000,000
7 3/4% Convertible Second Lien PIK Notes due 2019
Debt Instrument [Line Items]
Interest rate on senior notes		7.75%				7.75%					7.75%	7.75%
Principal		$ 268,432,000									$ 268,432,000
Interest payment terms											payable on April 1 and October 1,
Maturity of senior notes											Apr. 01, 2019
7 3/4% Senior Notes due 2019
Debt Instrument [Line Items]
Interest rate on senior notes		7.75%				7.75%					7.75%	7.75%
Principal amount of notes repurchased						$ 23,900,000				$ 87,500,000		$ 23,900,000
Principal	18,000,000	$ 17,959,000				$ 376,090,000					$ 17,959,000	$ 376,090,000
9½ % Convertible Second Lien PIK Notes due 2020
Debt Instrument [Line Items]
Interest rate on senior notes		9.50%				9.50%					9.50%	9.50%
Principal		$ 174,182,000									$ 174,182,000
Interest payment terms											payable on June 15 and December 15,
Maturity of senior notes											Jun. 15, 2020
Interest payment commencing date											Dec. 15, 2016
9 1/2% Senior Notes due 2020
Debt Instrument [Line Items]
Interest rate on senior notes		9.50%				9.50%					9.50%	9.50%
Principal amount of notes repurchased						$ 105,600,000				$ 19,800,000		$ 105,600,000
Principal	$ 4,900,000	$ 4,860,000				$ 194,367,000					$ 4,860,000	194,367,000
Aggregate purchase price of debt												42,700,000
7 3/4% Senior Notes due 2019 and 9 1/2% Senior Notes due 2020
Debt Instrument [Line Items]
Gain on extinguishment of debt											$ 89,600,000
Common stock shares exchanged for repayment of principal amount										2,748,403
Gain on repurchased amount of notes												$ 82,400,000
Convertible Second Lien PIK Notes
Debt Instrument [Line Items]
Debt instrument convertible conversion ratio											0.0812
Debt instrument convertible threshold consecutive trading days period											15 days
Convertible Second Lien PIK Notes \| Minimum
Debt Instrument [Line Items]
Daily volume weighted average price											$ 12.32
Exchange Offer
Debt Instrument [Line Items]
Percentage of outstanding senior notes	98.00%
Warrants exercisable	1,917,342
Exchange Offer \| 10 % Senior Secured Toggle Notes due 2020
Debt Instrument [Line Items]
Principal amount of notes issued	$ 697,200,000
Interest rate on senior notes	10.00%
Transaction costs											$ 4,500,000
Exchange Offer \| 10 % Senior Secured Notes due 2020
Debt Instrument [Line Items]
Interest rate on senior notes	10.00%
Principal amount of notes repurchased	$ 697,200,000
Gain (loss) on exchange of debt	0
Exchange Offer \| 7 3/4% Convertible Second Lien PIK Notes due 2019
Debt Instrument [Line Items]
Principal amount of notes issued	$ 270,600,000
Interest rate on senior notes	7.75%
Exchange Offer \| 7 3/4% Senior Notes due 2019
Debt Instrument [Line Items]
Interest rate on senior notes	7.75%
Principal amount of notes repurchased	$ 270,600,000
Exchange Offer \| 9½ % Convertible Second Lien PIK Notes due 2020
Debt Instrument [Line Items]
Principal amount of notes issued	$ 169,700,000
Interest rate on senior notes	9.50%
Exchange Offer \| 9 1/2% Senior Notes due 2020
Debt Instrument [Line Items]
Interest rate on senior notes	9.50%
Principal amount of notes repurchased	$ 169,700,000
Exchange Offer \| 7 3/4% Senior Notes due 2019 and 9 1/2% Senior Notes due 2020
Debt Instrument [Line Items]
Gain on extinguishment of debt	106,200,000
Exchange Offer \| Convertible Second Lien PIK Notes
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 6,500,000
Payment In Cash \| 7 3/4% Senior Notes due 2019 and 9 1/2% Senior Notes due 2020
Debt Instrument [Line Items]
Senior notes exchanged in cash										$ 3,500,000