Daily volume weighted average price.

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- Definition

Debt conversion principal amount plus accrued interest.

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No definition available.

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- Definition

Debt instrument, convertible, percentage of debt converted.

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- Definition

Debt instrument, interest rate, payment in kind.

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No definition available.

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- Definition

Debt restructuring costs.

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No definition available.

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- Definition

Maximum accrued interest payable in kind.

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- Definition

Maximum notes issuable for toggle interest paid in kind.

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No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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- Definition

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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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

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- Definition

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

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- Definition

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.

+ References

No definition available.

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- Definition

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

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- Definition

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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- Definition

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

+ References

No definition available.

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- Definition

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

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- Definition

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.

+ References

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Long-Term Debt - Additional Information (Detail)		3 Months Ended	9 Months Ended
Long-Term Debt - Additional Information (Detail)	Sep. 06, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Day $ / shares shares	Sep. 30, 2016 USD ($) shares
Debt Instrument [Line Items]
Gain on extinguishment of debt		$ 100,540,000		$ 190,116,000
Unamortized debt issuance costs			$ 12,027,000
Exchange Offer
Debt Instrument [Line Items]
Percentage of outstanding senior notes	98.00%
Transaction costs		4,400,000
10% Senior Secured Toggle Notes due 2020
Debt Instrument [Line Items]
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%
Maximum notes issuable for toggle interest paid in kind			$ 91,900,000
7¾% Convertible Second Lien PIK Notes due 2019
Debt Instrument [Line Items]
Interest payment terms			payable on April 1 and October 1
Maturity of senior notes			Apr. 01, 2019
9½% Convertible Second Lien PIK Notes due 2020
Debt Instrument [Line Items]
Interest payment terms			payable on September 15 and December 15
Maturity of senior notes			Sep. 15, 2020
Interest payment commencing date			Dec. 15, 2016
Convertible Second Lien PIK Notes
Debt Instrument [Line Items]
Debt instrument convertible conversion ratio			0.0812
Debt instrument convertible threshold consecutive trading days period \| Day			15
Convertible Second Lien PIK Notes \| Exchange Offer
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 6,500,000
Convertible Second Lien PIK Notes \| Minimum
Debt Instrument [Line Items]
Daily volume weighted average price \| $ / shares			$ 12.32
Converted Notes
Debt Instrument [Line Items]
Debt instrument, principal amount and accrued interest			$ 9,900,000
Common stock shares exchanged for repayment of principal amount \| shares			826,327
7¾% Convertible Second Lien PIK Notes due 2019 and 9½% Convertible Second Lien PIK Notes due 2020 \| Exchange Offer
Debt Instrument [Line Items]
Gain on extinguishment of debt	$ 106,200,000
7¾% Senior Notes due 2019
Debt Instrument [Line Items]
Principal amount of notes repurchased		87,500,000		87,500,000
9½% Senior Notes due 2020
Debt Instrument [Line Items]
Principal amount of notes repurchased		$ 19,800,000		$ 19,800,000
7 3/4% Senior Notes due 2019 and 9 1/2% Senior Notes due 2020
Debt Instrument [Line Items]
Common stock shares exchanged for repayment of principal amount \| shares				2,748,403
Gain on extinguishment of debt				$ 89,600,000
7 3/4% Senior Notes due 2019 and 9 1/2% Senior Notes due 2020 \| Payment In Cash
Debt Instrument [Line Items]
Senior notes exchanged in cash				$ 3,500,000