Goodwill and Other Intangible Assets, Net - Summary of Estimated Future Amortization Expense (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Estimated amortization expense, 2013	$ 1,300,000
Estimated amortization expense, 2014	2,600,000
Estimated amortization expense, 2015	1,500,000
Estimated amortization expense, 2016	800,000
Estimated amortization expense, 2017	700,000
Estimated amortization expense, 2018 and thereafter	300,000
Estimated amortization expense, Total	$ 7,194,000	$ 8,135,000