Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense associated with identifiable intangible assets	$ 1,500,000	$ 37,000
Estimated total amortization expense 2013	2,200,000
Estimated total amortization expense 2014	2,300,000
Estimated total amortization expense 2015	2,300,000
Estimated total amortization expense 2016	700,000
Estimated total amortization expense 2017	$ 400,000