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Share-based Compensation Plans - Schedule of Share-Based Compensation by Line Item in Consolidated Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense $ 6,267 $ 6,303 $ 6,648
Cost of sales [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense 104 592 153
Sales and marketing [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense 1,444 1,550 2,031
General and administrative [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense 4,483 4,023 4,322
Research and development [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense $ 236 $ 138 $ 142