Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
Mar. 31, 2015	Sep. 30, 2015
Debt Instrument [Line Items]
Minimum percentage of oil and gas properties used as collateral against Secured Notes and credit facility		80.00%
Write off of deferred issuance cost		$ 3.7
Bank credit facility
Debt Instrument [Line Items]
Ownership percentage of guarantor subsidiary		100.00%
10 % Senior Secured Notes due 2020
Debt Instrument [Line Items]
Debt instrument outstanding, value	$ 700.0
Interest rate on senior notes	10.00%	10.00%
Maturity of senior notes		Mar. 15, 2020
Net proceeds from issuance of debt	$ 684.0
Frequency of interest payments		semi-annually on each March 15 and September 15
7 3/4% Senior Notes due 2019
Debt Instrument [Line Items]
Debt instrument outstanding, value		$ 387.5
Interest rate on senior notes		7.75%
Maturity of senior notes		Apr. 01, 2019
Frequency of interest payments		semi-annually on each April 1 and October 1
Principal amount of notes repurchased		$ 12.5
9 1/2% Senior Notes due 2020
Debt Instrument [Line Items]
Debt instrument outstanding, value		$ 211.6
Interest rate on senior notes		9.50%
Maturity of senior notes		Jun. 15, 2020
Frequency of interest payments		semi-annually on each June 15 and December 15
Principal amount of notes repurchased		$ 88.4
7 3/4% Senior Notes due 2019 And 9 1/2% Senior Notes due 2020
Debt Instrument [Line Items]
Payment for repurchase of notes		37.8
Gain on repurchased amount of notes		$ 59.3

Minimum percentage of oil and gas properties used as collateral.

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- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

+ References

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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.

+ References

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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

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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

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.

+ References

No definition available.

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

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- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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