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Special Purpose Entities, Including Variable Interest Entities - Estimated Future Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
2013 $ 5,014
2014 9,308
2015 8,821
2016 8,493
2017 8,270
Thereafter $ 122,106