Derivatives and Fair Value Measurements - Additional Information (Detail) (USD $)	9 Months Ended					9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Foreign Exchange Forward [Member]	Dec. 31, 2013 Foreign Exchange Forward [Member]	Sep. 30, 2014 Nickel Futures or Option Contracts [Member] T	Dec. 31, 2013 Nickel Futures or Option Contracts [Member] T	Sep. 30, 2014 Hot Roll Steel Coil Option [Member] T	Dec. 31, 2013 Hot Roll Steel Coil Option [Member] T	Sep. 30, 2014 Aluminum Price Swaps [Member] T	Dec. 31, 2013 Aluminum Price Swaps [Member] T	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Maximum [Member]
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency exchange contracts				$ 2,400,000	$ 2,200,000
Commodity notional value						20	131	1,880	4,600	1,465	195
Contract term for exchange contracts, Maximum												3 months	12 months
Assets held for sale	5,400,000		4,700,000
Impairment charge of asset held for sale	0	2,000,000
Proceeds from sale of investments	$ 0