Derivatives and Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Proceeds from sale of investments	$ 0	$ 0	$ 0
Minimum [Member]
Derivatives, Fair Value [Line Items]
Contract term for exchange contracts, Maximum	3 months
Maximum [Member]
Derivatives, Fair Value [Line Items]
Contract term for exchange contracts, Maximum	12 months
Foreign exchange contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency exchange contracts	$ 2.2	$ 0.7
Nickel Futures or Option Contracts [Member]
Derivatives, Fair Value [Line Items]
Commodity notional value	131	182
Hot Roll Steel Coil Option Contracts [Member]
Derivatives, Fair Value [Line Items]
Commodity notional value	4,600	1,300
Aluminum Price Swaps [Member]
Derivatives, Fair Value [Line Items]
Commodity notional value	195	80