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Long-Term Debt (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2016	Aug. 31, 2016	Dec. 31, 2015	Sep. 30, 2015
Debt Instrument [Line Items]
Long-term debt	$ 2,450,000,000		$ 2,100,000,000	$ 2,100,000,000
Debt issuance costs	(16,511,000)		(15,279,000)	(15,985,000)
Long-term Debt	2,433,489,000		2,084,721,000	2,084,015,000
Less: current portion, net	(300,000,000)		(300,000,000)	0
Long-term debt	2,133,489,000		1,784,721,000	2,084,015,000
2010 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Long-term debt	500,000,000		500,000,000	500,000,000
2011 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Long-term debt	600,000,000		600,000,000	600,000,000
2013 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Long-term debt	500,000,000		500,000,000	500,000,000
2014 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Long-term debt	500,000,000		500,000,000	500,000,000
2016 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 350,000,000		$ 0	$ 0
Debt instrument, face amount		$ 350,000,000.0
Debt instrument, stated interest rate		2.35%
Prior to Par Call Date | 2016 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	100.00%
Interest rate margin for loans	20.00%
Subsequent to Par Call Date | 2016 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	100.00%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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-Topic 210
-SubTopic 10
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Face (par) amount of debt instrument at time of issuance.

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

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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