Description of the frequency of periodic payments (monthly, quarterly, annual).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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

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Balance Type:	na
Period Type:	duration

- Definition

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

+ 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(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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Balance Type:	na
Period Type:	instant

- Definition

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

+ References

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Balance Type:
Period Type:

- Details

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Period Type:

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Schedule of Debt Outstanding (Parenthetical) (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2016	Apr. 08, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 10,345,000		$ 11,923,000
Term Loan Due in July 2020
Debt Instrument [Line Items]
Debt interest rate	2.00%		2.00%
Debt maturity date	Jul. 31, 2020
Interest payable dates	interest payable periodically at variable interest rates.
Unamortized debt issuance costs	$ 400,000		$ 600,000
Senior Notes 4.625% Due 2023
Debt Instrument [Line Items]
Stated interest rate	4.625%
Debt maturity date	May 01, 2023
Interest payable dates	interest payable semi-annually in May and November at 4.625%.
Unamortized debt issuance costs	$ 4,100,000		4,500,000
Senior Notes 4.125% Due 2020
Debt Instrument [Line Items]
Stated interest rate	4.125%
Debt maturity date	Apr. 01, 2020
Interest payable dates	interest payable semi-annually in April and October at 4.125%.
Unamortized debt issuance costs	$ 2,900,000		3,500,000
Senior Notes 5.0% Due 2022
Debt Instrument [Line Items]
Stated interest rate	5.00%
Debt maturity date	Oct. 15, 2022
Interest payable dates	interest payable semi-annually in April and October at 5.0%.
Unamortized debt issuance costs	$ 2,900,000		3,300,000
Revolving Credit Facility \| $900.0 Million Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 900,000,000	$ 900,000,000	$ 900,000,000
Revolving Credit Facility maturity date	Jul. 31, 2020
Weighted average rate	2.00%		1.90%
Interest payable dates	interest payable periodically at variable interest rates.