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Debt - Redemption Prices (Detail)	12 Months Ended
	Dec. 31, 2015
2023 Notes | Debt instrument redemption period one
Debt Instrument [Line Items]
Percentage of debt redemption price	102.375%
2023 Notes | Debt instrument redemption period two
Debt Instrument [Line Items]
Percentage of debt redemption price	101.583%
2023 Notes | Debt instrument redemption period three
Debt Instrument [Line Items]
Percentage of debt redemption price	100.792%
2023 Notes | Debt instrument redemption period four and thereafter
Debt Instrument [Line Items]
Percentage of debt redemption price	100.00%
2024 Notes | Debt instrument redemption period one
Debt Instrument [Line Items]
Percentage of debt redemption price	102.688%
2024 Notes | Debt instrument redemption period two
Debt Instrument [Line Items]
Percentage of debt redemption price	101.792%
2024 Notes | Debt instrument redemption period three
Debt Instrument [Line Items]
Percentage of debt redemption price	100.896%
2024 Notes | Debt instrument redemption period four and thereafter
Debt Instrument [Line Items]
Percentage of debt redemption price	100.00%
2025 Notes | Debt instrument redemption period one
Debt Instrument [Line Items]
Percentage of debt redemption price	102.625%
2025 Notes | Debt instrument redemption period two
Debt Instrument [Line Items]
Percentage of debt redemption price	101.75%
2025 Notes | Debt instrument redemption period three
Debt Instrument [Line Items]
Percentage of debt redemption price	100.875%
2025 Notes | Debt instrument redemption period four and thereafter
Debt Instrument [Line Items]
Percentage of debt redemption price	100.00%

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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

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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

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