Debt - Summary of Debt (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Principal amount	$ 2,759,629
Debt issue costs, net	(32,982)	$ (28,367)
Debt	$ 2,728,549	$ 3,322,541
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate	Variable	Variable
Debt		$ 1,100,000
2006 Senior Unsecured Notes Due 2016 [Member]
Debt Instrument [Line Items]
Interest rate		Various
Senior unsecured notes, interest rate	5.675%
Debt	$ 60,000	$ 125,000
2011 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes, interest rate		6.875%
Debt		$ 450,000
2012 Senior Unsecured Notes Due 2022 [Member]
Debt Instrument [Line Items]
Principal amount	$ 350,000	$ 350,000
Senior unsecured notes, interest rate	6.375%	6.375%
Unamortized premium	$ 1,902	$ 2,168
Debt	$ 351,902	$ 352,168
2013 Senior Unsecured Notes due 2020 [Member]
Debt Instrument [Line Items]
Senior unsecured notes, interest rate	5.75%	5.75%
Debt	$ 224,700	$ 217,240
2014 Senior Unsecured Notes due 2024 [Member]
Debt Instrument [Line Items]
Senior unsecured notes, interest rate	5.50%	5.50%
Debt	$ 300,000	$ 300,000
2015 Senior Unsecured Notes due 2022 [Member]
Debt Instrument [Line Items]
Senior unsecured notes, interest rate	4.00%	4.00%
Debt	$ 561,750	$ 543,100
2016 Senior Unsecured Notes Due 2024 [Member]
Debt Instrument [Line Items]
Senior unsecured notes, interest rate	6.375%
Debt	$ 500,000
2016 Senior Unsecured Notes Due 2026 [Member]
Debt Instrument [Line Items]
Senior unsecured notes, interest rate	5.25%
Debt	$ 500,000
Term Loans [Member]
Debt Instrument [Line Items]
Interest rate	Various	Various
Debt	$ 263,179	$ 263,400
Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt	$ 2,761,531	$ 3,350,908

Debt Instrument Description Of Variable Rate Basis Prime

No definition available.

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- Definition

Debt Issuance Cost.

+ References

No definition available.

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- Definition

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.

+ References

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 FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: 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

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: 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

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-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

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