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Changes in accumulated other comprehensive income (loss) - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Net periodic benefit cost, net of tax	$ 0.2	$ 0.5
Net periodic benefit cost, tax portion	$ 0.1	$ 0.3

- Definition

Amount after tax of gain (loss) adjustment to other comprehensive income (loss) resulting from settlement or curtailment of defined benefit pension and other postretirement defined benefit plans.

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