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

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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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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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
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Weighted average interest rate of debt outstanding.

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- Definition

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

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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.

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Schedule of Debt Outstanding (Parenthetical) (Detail) - USD ($) $ in Thousands	1 Months Ended			6 Months Ended
	Oct. 31, 2017	Sep. 30, 2015	Apr. 30, 2013	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Unamortized debt issuance costs				$ 14,066	$ 11,813
Term Loan Due in April 2023
Debt Instrument [Line Items]
Debt interest rate				3.60%	3.10%
Debt maturity date				Apr. 30, 2023
Interest payable dates				interest payable periodically at variable interest rates.
Unamortized debt issuance costs				$ 100	$ 300
Senior Notes 4.625% Due 2023
Debt Instrument [Line Items]
Stated interest rate			4.625%	4.625%
Debt maturity date			May 01, 2023	May 01, 2023
Interest payable dates				interest payable semi-annually in May and November at 4.625%.
Unamortized debt issuance costs				$ 3,000	3,300
Senior Notes 4.125% Due 2020
Debt Instrument [Line Items]
Stated interest rate			4.125%	4.125%
Debt maturity date			Apr. 01, 2020	Apr. 01, 2020
Interest payable dates				interest payable semi-annually in April and October at 4.125%.
Unamortized debt issuance costs				$ 1,500	1,900
Senior Notes 5.0% Due 2022
Debt Instrument [Line Items]
Stated interest rate		5.00%		5.00%
Debt maturity date		Oct. 15, 2022		Oct. 15, 2022
Interest payable dates				interest payable semi-annually in April and October at 5.0%.
Unamortized debt issuance costs				$ 2,100	2,300
Senior Notes 4.75% Due 2027
Debt Instrument [Line Items]
Stated interest rate	4.75%			4.75%
Debt maturity date	Oct. 15, 2027			Oct. 15, 2027
Interest payable dates				interest payable semi-annually in April and October at 4.75%.
Unamortized debt issuance costs				$ 3,700	$ 4,000
Non-Recourse Mortgage Note 4.5% Due 2033
Debt Instrument [Line Items]
Stated interest rate				4.50%
Debt maturity date				Jan. 31, 2033
Interest payable dates				principal and interest at 4.5% payable monthly until maturity
Unamortized debt issuance costs				$ 300
Non-Recourse Mortgage Note 4.43% Due 2040
Debt Instrument [Line Items]
Stated interest rate				4.43%
Debt maturity date				Jan. 31, 2040
Interest payable dates				principal and interest at 4.43% payable quarterly beginning in July 2020 until maturity.
Unamortized debt issuance costs				$ 3,400
Revolving Credit Facility \| Revolving Credit Facility Due in April 2023
Debt Instrument [Line Items]
Revolving Credit Facility maturity date				Apr. 30, 2023
Weighted average rate				3.60%	3.10%
Interest payable dates				interest payable periodically at variable interest rates.