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Pearson - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 22, 2014
Jan. 22, 2013
Jan. 30, 2016
May. 02, 2015
Jan. 31, 2015
Schedule Of Activities And Transactions Associated With Related Cost [Line Items]          
Common stock, par value     $ 0.001 $ 0.001 $ 0.001
Pearson Plc          
Schedule Of Activities And Transactions Associated With Related Cost [Line Items]          
Aggregate purchase price paid in cash   $ 89,500      
Percentage of common membership interest   5.00%      
Percentage of common membership interest owned by Pearson plc   78.20%      
Preferred membership Interest   16.80%      
Warrants purchase   5.00%      
Pearson Plc | Common Stock          
Schedule Of Activities And Transactions Associated With Related Cost [Line Items]          
Aggregate purchase price, paid by shares 602,927        
Common stock, par value $ 0.001        
Pearson Plc | Series B Preferred          
Schedule Of Activities And Transactions Associated With Related Cost [Line Items]          
Aggregate purchase price paid in cash $ 13,750