Goodwill and Other Acquired Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill impairment charge	$ 12.2		$ 0	$ 12.2	$ 0
Intangible assets impairment charge		$ 1.0