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Amortization Expense Related to Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Expected Amortization Expense [Line Items]  
Remainder of 2012 $ 1,757
2013 2,560
2014 1,882
2015 1,844
2016 1,834
2017 846
Thereafter 685
Finite-Lived Intangible Assets, Net, Total $ 11,408