Segment, Customer Concentration and Geographical Information - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013 Location	Sep. 30, 2012 Location	Sep. 30, 2013 Customer Location Segment	Sep. 30, 2012 Location Customer
Revenue, Major Customer [Line Items]
Number of primary business units			2
Number of major customers			3	3
Number of geographic location	3	3	3	3
Customer Concentration Risk [Member] | Revenue [Member] | Minimum [Member]
Revenue, Major Customer [Line Items]
Percentage of concentration			10.00%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Sprint, Verizon Wireless and Fast Spring [Member]
Revenue, Major Customer [Line Items]
Percentage of concentration			88.00%	73.00%