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Other Intangible Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Finite-Lived Intangible Assets [Line Items]        
Amortization expense $ 227 $ 274 $ 452 $ 508