Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense on identifiable intangible assets	$ 6.9	$ 6.4
Expected amortization expenses in year one	28
Expected amortization expenses in year two	28
Expected amortization expenses in year three	28
Expected amortization expenses in year four	28
Expected amortization expenses in year five	28
Goodwill increase during period	267.5
Aerospace Corp. ("UFC")
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill increase during period	$ 257.7