Long-Term Debt - Additional Information (Detail) (3.75 % senior unsecured notes due September 1, 2016, USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2011
3.75 % senior unsecured notes due September 1, 2016
Debt Instrument [Line Items]
Senior unsecured notes, issued amount	$ 250
Senior unsecured notes, interest rate	3.75%
Senior unsecured notes, maturity date	Sep. 01, 2016
Senior unsecured notes, proceeds	$ 247.7
Senior unsecured notes, issuance costs amortization period	5 years
Senior unsecured notes, interest payments	semiannually
Senior unsecured notes, interest payment dates	March 1 and September 1

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Debt Instrument Issuance Costs Amortization Period

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Interest rate stated in the contractual debt agreement.

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The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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