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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.22(a)(1))

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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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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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Long-Term Debt (Footnote) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Feb. 01, 2015	Dec. 31, 2014	Jan. 12, 2015	Jan. 20, 2005
Debt Instrument [Line Items]
Repayments of long-term debt	$ 1,326,263us-gaap_RepaymentsOfLongTermDebt	$ 101us-gaap_RepaymentsOfLongTermDebt
1.875% Senior Notes
Debt Instrument [Line Items]
Unamortized discount	5,717			6,605
Debt instrument, interest rate	1.875%			1.875%
3.00% Senior Notes
Debt Instrument [Line Items]
Unamortized discount	291			306
Debt instrument, interest rate	3.00%			3.00%
4.15% Senior Notes
Debt Instrument [Line Items]
Unamortized discount	1,403			1,439
Debt instrument, interest rate	4.15%			4.15%
4.50% Senior Notes
Debt Instrument [Line Items]
Unamortized discount	1,793			1,871
Debt instrument, interest rate	4.50%			4.50%
4.625% Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate	4.625%				4.625%
Unamortized Premium	42,102				43,700
5.10% Senior Notes
Debt Instrument [Line Items]
Unamortized discount				3
Debt instrument, interest rate				5.10%		5.10%
Repayments of long-term debt			325,000
5.45% Senior Notes
Debt Instrument [Line Items]
Unamortized discount	1,020			1,029
Debt instrument, interest rate	5.45%			5.45%
Senior Unsecured Cash Bridge Facility \| Bridge Loan
Debt Instrument [Line Items]
Repayments of long-term debt	800,000
Short-term Debt \| Term Loan
Debt Instrument [Line Items]
Repayments of long-term debt	1,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of long-term debt	$ 250,000