Description of the Business - Additional Information (Detail) (USD $)	0 Months Ended	9 Months Ended
	Apr. 30, 2013	Sep. 30, 2013
Business Combinations [Abstract]
Proceeds from sale of business	$ 54,500,000
Proceed from sale of business, cash	52,500,000	9,698,000
Sale of business non-cash consideration	2,000,000
Period of free service provided	3 years
Divestiture related costs included in gain on sale of business	$ 2,400,000