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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
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Contractual interest rate for funds borrowed, under the debt agreement.

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

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Debt Facilities - Summary of Senior Notes (Detail) - USD ($)	Dec. 31, 2016	Dec. 06, 2016	Dec. 31, 2015	Nov. 30, 2014	Mar. 31, 2013
Debt Instrument [Line Items]
Long term debt, gross	$ 1,457,964,000		$ 1,243,699,000
Total long term debt	5,309,826,000
Senior Notes
Debt Instrument [Line Items]
Long term debt, gross	3,850,000,000		3,850,000,000
Less amount representing debt issuance cost	(39,230,000)		(45,366,000)
Total long term debt	3,810,770,000		3,804,634,000
Senior Notes \| 5.375% Senior Notes due 2023
Debt Instrument [Line Items]
Long term debt, gross	$ 1,000,000,000		1,000,000,000
Interest rate (percent)	5.375%				5.375%
Senior Notes \| 5.375% Senior Notes due 2022
Debt Instrument [Line Items]
Long term debt, gross	$ 750,000,000		750,000,000
Interest rate (percent)	5.375%			5.375%
Senior Notes \| 4.875% Senior Notes due 2020
Debt Instrument [Line Items]
Long term debt, gross	$ 500,000,000		500,000,000
Interest rate (percent)	4.875%				4.875%
Senior Notes \| 5.75% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Long term debt, gross	$ 500,000,000		500,000,000
Interest rate (percent)	5.75%
Senior Notes \| 5.875% Senior Notes Due 2026
Debt Instrument [Line Items]
Long term debt, gross	$ 1,100,000,000		1,100,000,000
Less amount representing debt issuance cost	$ (15,112,000)		$ (16,879,000)
Interest rate (percent)	5.875%	5.875%	5.875%