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Commitments and Contingencies - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Loss Contingencies [Line Items]    
Settlements on legal matters $ 37,000 $ 793,000
September Fifteenth Two Thousand Eight [Member]
   
Loss Contingencies [Line Items]    
"Lawsuit" filed date   September 15, 2008
September Eighteenth Two Thousand Eight [Member]
   
Loss Contingencies [Line Items]    
"Lawsuit" filed date   September 18, 2008
September Twenty Fourth Two Thousand Ten [Member]
   
Loss Contingencies [Line Items]    
"Lawsuit" filed date   September 24, 2010