Accumulated Other Comprehensive Loss - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Comprehensive income (loss)	$ 0.2	$ 13.7
Reclassified Comprehensive income (loss), Before tax		(0.2)
Other comprehensive income Pension liability, tax expense		$ (4.2)