Derivatives and Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended				3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Foreign Exchange Forward [Member]	Dec. 31, 2013 Foreign Exchange Forward [Member]	Mar. 31, 2014 Nickel Futures or Option Contracts [Member] T	Dec. 31, 2013 Nickel Futures or Option Contracts [Member] T	Mar. 31, 2014 Hot Roll Steel Coil Option [Member] T	Dec. 31, 2013 Hot Roll Steel Coil Option [Member] T	Mar. 31, 2014 Aluminum Price Swaps [Member] T	Dec. 31, 2013 Aluminum Price Swaps [Member] T
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency exchange contracts						$ 3.6	$ 2.2
Commodity notional value								97	131	3,180	4,600	50	195
Contract term for exchange contracts, Maximum				3 months	12 months
Assets held for sale	4.6		4.7
Impairment charge of asset held for sale		0.9
Proceeds from sale of investments	$ 0