Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Indebtedness - Debt Outstanding (Parenthetical) (Detail) - USD ($) $ in Thousands		12 Months Ended
	Sep. 16, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	May 31, 2015
Debt Instrument [Line Items]
Balance outstanding repaid to terminate debt		$ 1,487,000	$ 2,899,000	$ 1,884,000
4.875% Senior Notes Due 2025
Debt Instrument [Line Items]
Interest rate on notes		4.875%	4.875%		4.875%
5.00% Senior Notes Due 2023
Debt Instrument [Line Items]
Interest rate on notes	5.00%	5.00%	5.00%
5.00% Senior Notes Due 2022
Debt Instrument [Line Items]
Interest rate on notes	5.00%	5.00%	5.00%
5.75% Senior Notes Due 2021
Debt Instrument [Line Items]
Interest rate on notes	5.75%	5.75%	5.75%
5.875% Senior Notes Due 2022
Debt Instrument [Line Items]
Interest rate on notes		5.875%	5.875%
5.00% Senior Subordinated Notes Due 2023
Debt Instrument [Line Items]
Interest rate on notes	5.00%	5.00%	5.00%
5.00% Senior Subordinated Notes Due 2022
Debt Instrument [Line Items]
Interest rate on notes	5.00%	5.00%	5.00%
5.75% Senior Subordinated Notes Due 2021
Debt Instrument [Line Items]
Interest rate on notes	5.75%	5.75%	5.75%
Other Senior Notes Due 2022
Debt Instrument [Line Items]
Interest rate on notes		5.875%
Notes Payable to Banks \| 2.4% Bank Debt
Debt Instrument [Line Items]
Bank debt percentage		2.40%	2.40%
MRD
Debt Instrument [Line Items]
Balance outstanding repaid to terminate debt	$ 597,000	$ 597,000	$ 0	$ 0