Segment Reporting - Summary of Financial Metrics of Operating Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Total revenues	$ 49,669	$ 55,116	$ 155,067	$ 167,812
Operating expenses:
Total operating expenses	40,135	42,069	121,888	126,698
Operating income (loss):
Total operating income	9,534	13,047	33,179	41,114
EBITDA (as defined by the Company):
Total EBITDA	13,392	17,771	44,666	54,959
% of revenue	27.00%	32.20%	28.80%	32.80%
Capital expenditures:
Total capital expenditures	2,504	2,696	7,772	7,135
OCF (as defined by the Company):
Total OCF	10,888	15,075	36,894	47,824
% of revenue	21.90%	27.40%	23.80%	28.50%
Wireless Operations [Member]
Revenues:
Total revenues	37,067	41,440	113,617	128,488
Operating expenses:
Total operating expenses	25,685	28,079	78,358	86,538
Operating income (loss):
Total operating income	11,382	13,361	35,259	41,950
EBITDA (as defined by the Company):
Total EBITDA	13,819	16,305	42,472	50,563
Capital expenditures:
Total capital expenditures	2,509	2,658	7,586	7,031
OCF (as defined by the Company):
Total OCF	11,310	13,647	34,886	43,532
Software Operations [Member]
Revenues:
Total revenues	12,602	13,676	41,450	39,324
Operating expenses:
Total operating expenses	14,450	13,990	43,530	40,160
Operating income (loss):
Total operating income	(1,848)	(314)	(2,080)	(836)
EBITDA (as defined by the Company):
Total EBITDA	(427)	1,466	2,194	4,396
Capital expenditures:
Total capital expenditures	(5)	38	186	104
OCF (as defined by the Company):
Total OCF	$ (422)	$ 1,428	$ 2,008	$ 4,292