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Restructuring Charges Included in Accrued Expenses in Accompanying Consolidated Balance Sheets (Detail) (Employee Severance Benefits, USD $)
12 Months Ended
Dec. 31, 2013
Employee Severance Benefits
 
Restructuring Cost and Reserve [Line Items]  
Beginning balance   
Restructuring charges 2,781,000
Cash payments (2,646,000)
Ending balance $ 135,000