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.

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Face (par) amount of debt instrument at time of issuance.

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

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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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No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-Paragraph 19, 20, 22
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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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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 cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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No definition available.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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Debt - Additional Information (Detail) - USD ($)		12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Mar. 25, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument
Repayments of lines of credit		$ 220,000,000	$ 0	$ 0
Senior Notes \| Senior Unsecured Five Year Term Loan issued March 2015
Debt Instrument
Interest rate		1.8125%
Unamortized debt issuance expense		$ 2,000,000
Revolving credit agreement period (in years)	5 years	5 years
Term loan, face amount	$ 600,000,000
Long-term debt, gross amount		$ 600,000,000
Senior Notes \| Senior Unsecured Term Loan Issued Prior to March 2015
Debt Instrument
Repayments of debt	$ 247,000,000
Line of Credit \| Revolving Credit Facility \| Five-Year Revolving Credit Facility Established Prior to March 2015
Debt Instrument
Expiration period	5 years
Credit facility maximum borrowing capacity	$ 300,000,000
Repayments of lines of credit	220,000,000
Line of Credit \| Revolving Credit Facility \| Revolving Credit Facility Ending in March 2020
Debt Instrument
Credit facility maximum borrowing capacity	$ 400,000,000
Credit facility outstanding balance		$ 180,000,000
Interest rate		1.623%
Credit facility borrowing capacity		$ 220,000,000
Unamortized debt issuance expense		$ 1,000,000
Revolving credit agreement period (in years)		5 years