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Summary of Total Indebtedness (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Fair value of interest rate swap	$ 15.2	$ 12.6
Series 2005-1 Notes
Debt Instrument [Line Items]
Fair value of interest rate swap	13.8	11.5
2010 Senior Notes
Debt Instrument [Line Items]
Unamortized discount	2.6	2.7
2012 Senior Notes
Debt Instrument [Line Items]
Unamortized discount	$ 3.8

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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