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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)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03.16)
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Debt Facilities - Summary of Senior Notes (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Nov. 30, 2014	Dec. 31, 2013	Mar. 31, 2013
Debt Instrument [Line Items]
Long term debt, gross	$ 1,243,699	$ 593,471
Total long term debt	5,245,768
Interest rate (percent)				8.125%
Senior Notes [Member]
Debt Instrument [Line Items]
Long term debt, gross	3,850,000	2,750,000
Less amount representing debt issuance cost	(45,366)	(32,954)
Total long term debt	3,804,634	2,717,046
Senior Notes [Member] \| 5.375% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Long term debt, gross	$ 1,000,000	1,000,000
Interest rate (percent)	5.375%				5.375%
Senior Notes [Member] \| 5.375% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Long term debt, gross	$ 750,000	750,000
Interest rate (percent)	5.375%		5.375%
Senior Notes [Member] \| 4.875% Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Long term debt, gross	$ 500,000	500,000
Interest rate (percent)	4.875%				4.875%
Senior Notes [Member] \| 5.75% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Long term debt, gross	$ 500,000	$ 500,000
Interest rate (percent)	5.75%
Senior Notes [Member] \| 5.875% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Long term debt, gross	$ 1,100,000
Less amount representing debt issuance cost	$ (16,904)
Interest rate (percent)	5.875%