Pension and Post-Retirement Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]
Cash contribution to pension plans in next fiscal year			$ 2.0	$ 13.0
Pension plan liabilities	18.6		18.6		20.8
Company contributions	$ 1.4	$ 1.3	$ 4.2	$ 4.2