Long-Lived Assets - Summary of Depreciation, Amortization and Accretion (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Depreciation	$ 9,664	$ 11,054	$ 13,253
Amortization	4,965	6,411	5,274
Accretion	538	767	807
Total depreciation, amortization and accretion	15,167	18,232	19,334
Wireless Operations [Member]
Property, Plant and Equipment [Line Items]
Total depreciation, amortization and accretion	9,600	11,200	14,000
Software Operations [Member]
Property, Plant and Equipment [Line Items]
Accretion	(29,000)	29,000
Total depreciation, amortization and accretion	$ 5,600	$ 7,000	$ 5,300