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Long-Term Debt (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Aug. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 2,150,000,000	$ 2,150,000,000	$ 2,450,000,000
Debt issuance costs	(13,596,000)	(15,729,000)	(16,511,000)
Long-term debt	2,136,404,000	2,134,271,000	2,433,489,000
Less: current portion, net	(250,000,000)	0	(300,000,000)
Total long-term debt	1,886,404,000	2,134,271,000	2,133,489,000
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	300,000,000	300,000,000	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	$ 350,000,000	$ 350,000,000
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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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 accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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