Segment, Customer Concentration and Geographical Information - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2013 Location	Jun. 30, 2012 Location	Jun. 30, 2013 Customer Location Segment	Jun. 30, 2012 Location Customer
Revenue, Major Customer [Line Items]
Number of primary business units			2
Number of Major Customers			3	2
Number of Geographic Location	3	3	3	3
Accounts Receivable [Member] | Sprint, Verizon Wireless and Fast Spring [Member]
Revenue, Major Customer [Line Items]
Percentage of concentration			91.00%
Accounts Receivable [Member] | Sprint and Verizon Wireless [Member]
Revenue, Major Customer [Line Items]
Percentage of concentration				69.00%
Revenue [Member] | Minimum [Member]
Revenue, Major Customer [Line Items]
Percentage of concentration			10.00%