Multi-employer Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Multiemployer Plans [Line Items]
COMPANY CONTRIBUTIONS	$ 30.1	$ 26.9	$ 24.6
Metal and Electrical Engineering Industry Pension Fund
Multiemployer Plans [Line Items]
PENSION PLAN NUMBER	135668
COMPANY CONTRIBUTIONS	27.1	24.5	22.0
Western Metal Industry Pension Plan
Multiemployer Plans [Line Items]
EIN	916033499
PENSION PLAN NUMBER	1
COMPANY CONTRIBUTIONS	2.0	1.5	1.6
Other Pension Plans, Defined Benefit
Multiemployer Plans [Line Items]
COMPANY CONTRIBUTIONS	$ 1.0	$ 0.9	$ 1.0