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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 $ 47,098
2014 57,168
2015 51,252
2016 49,421
2017 48,518
2018 and Thereafter 250,271
Total $ 503,728