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Fair Value Measurements Additional Information (Detail) (Mutual funds, USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure, Recurring	$ 0.4
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure, Recurring	$ 3.0

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant