Segment Reporting - Segment Information for Total Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total Assets	$ 324,363	$ 322,627
Wireless Operations [Member]
Segment Reporting Information [Line Items]
Total Assets	165,267	158,261
Software Operations [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 159,096	$ 164,366