Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended					1 Months Ended	3 Months Ended												12 Months Ended			36 Months Ended		12 Months Ended			0 Months Ended	11 Months Ended	12 Months Ended		0 Months Ended				0 Months Ended		0 Months Ended		0 Months Ended	12 Months Ended		0 Months Ended		12 Months Ended					0 Months Ended	12 Months Ended					3 Months Ended	12 Months Ended	19 Months Ended		0 Months Ended	11 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended			12 Months Ended						12 Months Ended	19 Months Ended	0 Months Ended					12 Months Ended
	Aug. 01, 2012	Mar. 15, 2011	Jan. 03, 2011	Jan. 02, 2010	Jan. 02, 2009	Jul. 31, 2008	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, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	May 16, 2012	Dec. 31, 2013 Non-Executive Directors Restricted Stock Units RSU [Member]	Dec. 31, 2012 Non-Executive Directors Restricted Stock Units RSU [Member]	Dec. 31, 2011 Non-Executive Directors Restricted Stock Units RSU [Member]	Jan. 22, 2013 Restricted Stock Units [Member] Wireless Operations [Member]	Dec. 31, 2013 Restricted Stock Units [Member] Wireless Operations [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Payroll and related expense [Member]	Mar. 06, 2014 Subsequent Event [Member]	Jan. 02, 2014 Subsequent Event [Member]	Mar. 07, 2014 Subsequent Event [Member]	Jul. 30, 2012 Maximum [Member]	Apr. 19, 2013 2004 Equity Plan [Member]	Dec. 31, 2013 2004 Equity Plan [Member]	Apr. 26, 2013 2004 Equity Plan [Member] Restricted Stock Units [Member]	May 16, 2012 2012 Equity Plan [Member]	Jan. 06, 2009 2009 LTIP [Member]	Dec. 31, 2013 2009 LTIP [Member]	Dec. 31, 2012 2009 LTIP [Member]	Apr. 26, 2013 2009 LTIP [Member] Restricted Stock Units [Member]	Dec. 31, 2012 2009 LTIP [Member] Restricted Stock Units [Member]	Dec. 31, 2011 2009 LTIP [Member] Stock Based Compensation Expense [Member]	Dec. 31, 2012 2009 LTIP [Member] Payroll and related expense [Member]	Dec. 31, 2011 2009 LTIP [Member] Payroll and related expense [Member]	Dec. 31, 2013 2011 Long Term Incentive Plan [Member] Wireless Operations [Member]	Dec. 13, 2013 2011 Long Term Incentive Plan [Member] Wireless Operations [Member] Employees	Apr. 07, 2011 2011 Long Term Incentive Plan [Member] Software Operations [Member]	Dec. 31, 2013 2011 Long Term Incentive Plan [Member] Software Operations [Member]	Dec. 31, 2012 2011 Long Term Incentive Plan [Member] Software Operations [Member]	Dec. 31, 2011 2011 Long Term Incentive Plan [Member] Software Operations [Member]	Dec. 13, 2013 2011 Long Term Incentive Plan [Member] Software Operations [Member] Employees	Dec. 27, 2012 2011 Long Term Incentive Plan [Member] Software Operations [Member] Employees	Jun. 30, 2012 2011 Long Term Incentive Plan [Member] Restricted Stock Units [Member]	Dec. 31, 2013 2011 Long Term Incentive Plan [Member] Restricted Stock Units [Member]	Dec. 31, 2013 2011 Long Term Incentive Plan [Member] Restricted Stock Units [Member]	Dec. 31, 2012 2011 Long Term Incentive Plan [Member] Restricted Stock Units [Member]	Jan. 22, 2013 2011 Long Term Incentive Plan [Member] Restricted Stock Units [Member] Wireless Operations [Member]	Dec. 31, 2013 2011 Long Term Incentive Plan [Member] Restricted Stock Units [Member] Wireless Operations [Member]	Dec. 31, 2013 2011 Long Term Incentive Plan [Member] Restricted Stock Units [Member] Wireless Operations [Member]	Apr. 07, 2011 2011 Long Term Incentive Plan [Member] Restricted Stock Units [Member] Software Operations [Member]	Dec. 31, 2013 2011 Long Term Incentive Plan [Member] Restricted Stock Units [Member] Software Operations [Member]	Dec. 31, 2012 2011 Long Term Incentive Plan [Member] Restricted Stock Units [Member] Software Operations [Member]	Jun. 30, 2012 2011 Long Term Incentive Plan [Member] Restricted Stock Units [Member] Software Operations [Member]	Dec. 31, 2012 2011 Long Term Incentive Plan [Member] Forfeited [Member]	Dec. 31, 2013 Executive [Member] Software Operations [Member] Employees	Jul. 23, 2013 Chairperson Of Audit Committee [Member]	Aug. 01, 2007 Chairperson Of Audit Committee [Member]	Jul. 23, 2013 Non-Executive Director [Member]	Aug. 01, 2007 Non-Executive Director [Member]	Dec. 31, 2013 Non Executive Directors [Member]	Dec. 31, 2013 Non Executive Directors [Member] Restricted Stock [Member]	Jul. 23, 2013 Former Non Executive Director [Member] [Member] Restricted Stock [Member]	Jul. 23, 2013 Annually [Member] Chairperson Of Audit Committee [Member]	Aug. 01, 2007 Annually [Member] Chairperson Of Audit Committee [Member]	Jul. 23, 2013 Annually [Member] Non-Executive Director [Member]	Aug. 01, 2007 Annually [Member] Non-Executive Director [Member]	Dec. 31, 2013 Common Stock Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized							75,000,000				75,000,000								75,000,000	75,000,000		75,000,000
Common stock par value							$ 0.0001				$ 0.0001								$ 0.0001	$ 0.0001		$ 0.0001
Preferred stock authorized							25,000,000				25,000,000								25,000,000	25,000,000		25,000,000
Preferred stock par value							$ 0.0001				$ 0.0001								$ 0.0001	$ 0.0001		$ 0.0001
Stock options outstanding							0				0								0	0		0
Common stock outstanding							21,652,341				21,701,353								21,652,341	21,701,353		21,652,341
Preferred stock outstanding							0				0								0	0		0
Dividend Declaration Date																															Mar. 05, 2014
Dividend Record Date																															Mar. 18, 2013
Dividend Payment Date																															March 28, 2013
Dividend rate																																	$ 0.125	$ 0.250
Dividends declared																															$ 2,700,000
Common Stock Repurchase Program, authorized amount	25,000,000.0		25,000,000.0	25,000,000.0	25,000,000.0	50,000,000.0																										15,000,000.0
Common stock repurchased, shares							6,268,504												6,268,504			6,268,504
Common stock purchases, value							59,800,000												59,800,000			59,800,000
Additional paid-in capital							127,300,000				125,200,000								127,300,000	125,200,000		127,300,000
Increase in additional paid-in capital							2,100,000												2,100,000			2,100,000
Purchased and retired common stock, shares									108,459
Shares acquired under common stock repurchase program							0	0	108,459	0	277,191	434,982	0	21,657	0	0	0	20,027	108,459	733,830	20,027	862,316																																																									0
Equity securities approved under the 2004 Equity Plan																																				1,878,976
Maximum equity securities available under 2012 Equity Plan							1,720,752												1,720,752			1,720,752	2,194,986													81,957
Equity securities available under the 2004 Equity Plan																																						894,986
Equity securities granted																																						1,300,000
Amortized period		45 months																																					48 months		48 months
Restricted stock units awarded to certain eligible employees																				338,834
Restricted stock units and cash dividends forfeited																																											80,104																						101,294
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number																																											258,730													617,027	617,027	232,966		390,030	390,030		226,997	232,966
Amortization of share based compensation																																									3,100,000										200,000			1,600,000
Total stock based compensation																								200,000	200,000	200,000				3,000,000										0	900,000			700,000	900,000	700,000	2,000,000			800,000	100,000	600,000														400,000
Number of departed employees																																																																			2
RSU converted into common stock																																			258,730
Dividends and Interest Paid																																					1,500,000
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards																																										0
Restricted stock units awarded to certain eligible employees																																																											253,739	138,980		211,587	42,092	122,673
RSUs at fair value																											2,700,000	2,000,000																					3,000,000	500,000	1,300,000
Closing price of common stock																																																	$ 15.68
Fair value of restricted stock units and cash dividends forfeited																																																							1,400,000
Number of employees affected due to modification																																																14					37	18
RSUs, forfeited																																																													2,689		48,061
Fair value of RSUs, net of forfeitures																																															26,000			500,000.0
Deferred Compensation Share-based Arrangements, Annual Stock Award, Amount																																																																											70,000	50,000	60,000	40,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period																													1 year
Deferred Compensation Cash-based Arrangements, Annual Payment Amount																																																																				55,000	50,000	45,000	40,000
Share Based Compensation Arrangement By Share Based Payment Value Of Shares Require To Held																																																																				165,000		135,000
Grace Period Of Restricted Stock Threshold																																																																								3 years
Forfeited, shares																																																								50,750	152,044																3,189	3,189
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures																										$ 600,000