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Estimate Amortization Expense for Next Three Years (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]  
2013 $ 701
2014 701
2015 493
2016 466
2017 442
Future 2,021
Finite-Lived Intangible Assets, Net, Total $ 4,824