Debt - Summary of Debt (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014	Aug. 19, 2015
Debt Instrument [Line Items]
Principal amount	$ 3,361,863
Debt	$ 3,364,119	$ 2,201,654
2011 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes, interest rate	6.875%	6.875%
Debt	$ 450,000	$ 450,000
Revolving credit facility [Member]
Debt Instrument [Line Items]
Interest rate	Variable	Variable
Debt	$ 1,091,000	$ 593,490
2006 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Interest rate	Various	Various
Debt	$ 125,000	$ 125,000
2012 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Principal amount	$ 350,000	$ 350,000
Senior unsecured notes, interest rate	6.375%	6.375%
Unamortized premium	$ 2,256	$ 2,522
Debt	$ 352,256	$ 352,522
2013 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes, interest rate	5.75%	5.75%
Debt	$ 223,540	$ 241,960
2014 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes, interest rate	5.50%	5.50%
Debt	$ 300,000	$ 300,000
2015 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes, interest rate	4.00%		4.00%
Debt	$ 558,850
Term Loans [Member]
Debt Instrument [Line Items]
Interest rate	Various	Various
Debt	$ 263,473	$ 138,682

Debt Instrument Description Of Variable Rate Basis Prime

No definition available.

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- Definition

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.

+ 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 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

-Section 03

-Paragraph 16

-Article 9

+ Details

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- Definition

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

+ References

+ Details

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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.

+ Details

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- Definition

The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ 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=6451184&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=34725769&loc=d3e28878-108400

+ Details

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- Definition

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

-SubTopic 210

-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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