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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The carrying value as of the balance sheet date of the current portion 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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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Long-Term Debt - Long-Term Debt Instrument (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Apr. 16, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Current portion of short-term debt	$ 38,750		$ 100,000
Total notes	623,432		150,000
Total credit agreements	536,250	25,000	230,000
Total long-term debt	1,159,682		380,000
Current portion of short-term debt	38,750		100,000
Total debt	1,198,432		480,000
Current Portion of 5-Year Term Loan Facility Expires 2019 [Member]
Debt Instrument [Line Items]
Current portion of 5-year term loan facility expires 2019	13,750
6.080% Senior Notes, Semi-Annual Interest Payments, Balloon Due 2014 [Member]
Debt Instrument [Line Items]
Current portion of senior notes			100,000
5.370% Senior Notes, Quarterly Interest Payments, Balloon Due 2015 [Member]
Debt Instrument [Line Items]
Current portion of senior notes	25,000
Total notes			25,000
5.660% Senior Notes, Semi-Annual Interest Payments, Balloon Due 2016 [Member]
Debt Instrument [Line Items]
Total notes	25,000		25,000
4.500% Senior Notes, Quarterly Interest Payments, Balloon Due 2018 [Member]
Debt Instrument [Line Items]
Total notes	100,000		100,000
4.200% Senior Notes, Semi-Annual Interest Payments, Balloon Due 2024 [Member]
Debt Instrument [Line Items]
Total notes	498,432
Periodic Payments of Interest, LIBOR Plus 1.00%, Expires December 31, 2016 [Member]
Debt Instrument [Line Items]
Total credit agreements			100,000
Quarterly Payments of Interest, LIBOR Plus 1.00%, Expires December 31, 2016 [Member]
Debt Instrument [Line Items]
Total credit agreements			100,000
Periodic Payments of Interest, LIBOR Plus 1.00%, Expires December 31, 2016 [Member]
Debt Instrument [Line Items]
Total credit agreements			30,000
5-Year Term-Loan Facility, Periodic Interest and Principal Payments, Currently LIBOR Plus 1.375%, Expires May 20, 2019
Debt Instrument [Line Items]
Total credit agreements	536,250
5-Year Revolving-Loan Facility, Periodic Interest Payments, Currently LIBOR Plus 1.175%, Plus Commitment Fees of 0.20%, Expires May 20, 2019 [Member]
Debt Instrument [Line Items]
Total credit agreements
Revolving Credit Loan, Quarterly Interest Payments, LIBOR Plus up to 1.40% and Availability Fee up to 0.25%, Expires December 31, 2016 [Member]
Debt Instrument [Line Items]
Total credit agreements