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Goodwill and Intangible Assets - Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
2013 (remaining) $ 1,536
2014 1,685
2015 1,668
2016 1,511
2017 1,469
2018 1,460
Thereafter $ 4,421