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Geographic Information and Major Clients - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Customer
Sep. 30, 2014
Customer
Sep. 30, 2015
Customer
Unit
Segment
Sep. 30, 2014
Customer
Dec. 31, 2014
Customer
Geographic information and major clients          
Number of reportable segment, digital enterprise business solutions | Segment     1    
Number of reporting unit | Unit     1    
Clients accounting for 10% or more of total revenue or outstanding trade receivables     There were no clients accounting for 10% or more of the Company's total revenue during the third quarter and nine months of 2015 and 2014. There were no clients accounting for 10% or more of the Company's total outstanding trade receivables as of September 30, 2015 and December 31, 2014.    
Number of clients representing 10% or more of Company's total revenue 0 0 0 0  
Number of clients representing 10% or more of Company's total outstanding trade receivables     0   0
Credit Concentration Risk | Total Revenue | Minimum          
Geographic information and major clients          
Concentration risk, percentage 10.00% 10.00% 10.00% 10.00%  
Credit Concentration Risk | Accounts receivable | Minimum          
Geographic information and major clients          
Concentration risk, percentage     10.00%   10.00%