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Accumulated Other Comprehensive Income - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Equity [Abstract]
Amounts reclassified out of accumulated other comprehensive income related to defined benefit pension plans as component of net periodic benefit cost, actuarial net gain or loss	$ 0.4	$ 0.2

- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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