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Debt - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) extension	Mar. 31, 2016 USD ($)
Revolving Credit Facility Ending in March 2020
Debt Instrument
Credit facility maximum borrowing capacity	$ 400,000,000
Senior Notes | Senior Unsecured Five Year Term Loan issued March 2015
Debt Instrument
Term loan, face amount		$ 600,000,000
Long-term debt, gross amount	$ 540,000,000
Interest rate	3.375%
Unamortized debt issuance expense	$ 1,000,000
Revolving credit agreement period (in years)	5 years
Line of Credit | Revolving Credit Facility | Revolving Credit Facility Ending in March 2020
Debt Instrument
Unamortized debt issuance expense	$ 1,000,000
Revolving credit agreement period (in years)	5 years
Number of one year extensions | extension	2
Duration of extension term	1 year
Current borrowing capacity	$ 240,000,000
Remaining borrowing capacity	$ 160,000,000
Interest rate	5.00%

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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

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-Name Accounting Standards Codification
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Face (par) amount of debt instrument at time of issuance.

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Reference 1: 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

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

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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.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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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.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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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