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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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-Name Accounting Standards Codification

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-Name Accounting Standards Codification

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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Debt - Summary of Debt and Capital Lease Obligations (Parenthetical) (Detail) (USD $)	Dec. 31, 2014	Apr. 18, 2013	Dec. 31, 2013
Debt Instrument [Line Items]
Total credit facility	$ 1,000,000,000	$ 925,000,000
3.75% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate of Senior Notes	3.75%
Debt discount on Convertible Senior Notes	0		10,096,000
$1 Billion Credit Facility [Member]
Debt Instrument [Line Items]
Total credit facility	1,000,000,000
$400 Million Term Loan Facility [Member]
Debt Instrument [Line Items]
Total credit facility	$ 400,000,000
5% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate of Senior Notes	5.00%