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Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Product Information [Line Items]
Cash surrender values, Gross	$ 19.1	$ 19.0
Gross amount of policy loans	17.3	17.4
Cash surrender values, Net of policy loans	$ 1.8	$ 1.6

- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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