Pension and Post-Retirement Benefits (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Pension Benefits
Defined Benefit Plan Disclosure
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.50%	4.10%
Expected contributions in current fiscal year	$ 0.0
Post-retirement Benefits
Defined Benefit Plan Disclosure
Expected contributions in current fiscal year	$ 1.4