Components of Net Periodic Benefit Cost (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	12 Months Ended
	Apr. 01, 2003	Mar. 31, 2015	Dec. 31, 2006	Dec. 31, 2002	Apr. 01, 2003
Compensation and Retirement Disclosure [Abstract]
Defined benefit plan age of attainment	21 years
Service period for employees of coverage age, years	1 year
Defined benefit plan, percentage vested					100.00%
Benefits paid		$ 4.3
Charge associated with employees that elected to receive lump sum pension distributions		$ 1.3
Retiree benefits eliminated if less than service period, years		10 years	10 years	10 years