Debt Facilities - Summary of Senior Notes (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt, Gross	$ 1,640,702	$ 1,243,699
Long-term debt, Net	5,642,849
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	3,850,000	3,850,000
Less amount representing debt issuance cost	(43,833)	(45,366)
Long-term debt, Net	3,806,167	3,804,634
Senior Notes [Member] \| 5.375% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	$ 1,000,000	1,000,000
Senior notes stated percentage	5.375%
Senior Notes [Member] \| 5.375% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	$ 750,000	750,000
Senior notes stated percentage	5.375%
Senior Notes [Member] \| 4.875% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	$ 500,000	500,000
Senior notes stated percentage	4.875%
Senior Notes [Member] \| 5.75% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	$ 500,000	500,000
Senior notes stated percentage	5.75%
Senior Notes [Member] \| 5.875% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	$ 1,100,000	$ 1,100,000
Senior notes stated percentage	5.875%

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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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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