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Pension Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Compensation And Retirement Disclosure [Abstract]
Increase in fair value of qualified plan assets	$ 9.8
Increased percent in fair value of qualified plan assets	7.10%
Fair value of plan assets	148.7	138.9
Contribution to qualified plan	$ 25.0

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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