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Components of Long-Term Debt Obligations (Parenthetical) (Detail)	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
6 3/4 % Senior Notes Due 2020
Debt Instrument [Line Items]
Interest percentage	6.75%	6.75%	6.75%
Debt maturity period	2020	2020	2020
6.0% Senior Notes Due 2022
Debt Instrument [Line Items]
Interest percentage		6.00%	6.00%
Debt maturity period		2022	2022

X

- Definition

Debt instrument maturity year.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

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

+ 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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X

- 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.

+ Details

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X

- Details

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X

- Details

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