Segment Reporting - Summary of Financial Metrics of Operating Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Total revenues	$ 54,685	$ 49,669	$ 52,268	$ 53,130	$ 51,884	$ 55,116	$ 55,961	$ 56,735	$ 209,752	$ 219,696	$ 233,693
Operating expenses:
Total operating expenses									164,258	173,968	181,864
Operating income (loss):
Total operating income	12,315	9,534	11,905	11,740	4,614	13,047	13,810	14,257	45,494	45,728	51,829
EBITDA (as defined by the Company):
Total EBITDA									60,661	67,342	71,163
% of revenue									28.90%	30.70%	30.50%
Capital expenditures:
Payments to Acquire Property, Plant, and Equipment									10,408	9,989	7,952
% of revenue									5.00%	4.50%	3.40%
OCF (as defined by the Company):
Total OCF									50,253	57,353	63,211
% of revenue									24.00%	26.10%	27.00%
Wireless Operations [Member]
Revenues:
Total revenues									149,448	168,405	199,701
Operating expenses:
Total operating expenses									104,319	115,056	139,319
Operating income (loss):
Total operating income									45,129	53,349	60,382
EBITDA (as defined by the Company):
Total EBITDA									54,663	64,516	74,355
Capital expenditures:
Payments to Acquire Property, Plant, and Equipment									10,073	9,746	7,788
OCF (as defined by the Company):
Total OCF									44,590	54,770	66,567
Software Operations [Member]
Revenues:
Total revenues									60,304	51,291	33,992
Operating expenses:
Total operating expenses									59,939	58,912	42,545
Operating income (loss):
Total operating income									365	(7,621)	(8,553)
EBITDA (as defined by the Company):
Total EBITDA									5,998	2,826	(3,192)
Capital expenditures:
Payments to Acquire Property, Plant, and Equipment									335	243	164
OCF (as defined by the Company):
Total OCF									$ 5,663	$ 2,583	$ (3,356)