Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Other assets
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Unamortized debt issuance costs	$ 11,900,000	$ 9,500,000
Amended Revolving Credit Facility
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Line of credit facility maximum borrowing capacity	$ 900,000,000

Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]

No definition available.

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- 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

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 210.5-02.19(b),22(b))

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

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- 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.

+ 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 210.5-02.17)

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

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