Geographic Information and Major Clients - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014 Segment	Dec. 31, 2013 Customer
Geographic information and major clients
Number of operating segments	1
Number of reportable segment, digital enterprise business solutions	1
Clients accounting for 10% or more of total revenue	There were no clients accounting for 10% or more of the Company's total revenue in 2014, 2013, and 2012.
Number of customers that accounted for 10% or more of outstanding trade receivables		1
Accounts Receivable | Minimum
Geographic information and major clients
Percentage of company outstanding trade receivables accounted by client		10.00%