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Fair Value Disclosures - Additional Information (Detail) (Fair Value, Inputs, Level 2, Fixed-Rate Debt, USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Inputs, Level 2 \| Fixed-Rate Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt outstanding carrying value	$ 43.8	$ 43.8
Debt outstanding fair value	$ 49.7	$ 50.1

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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