Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended			0 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			3 Months Ended								16 Months Ended	24 Months Ended					0 Months Ended				9 Months Ended	0 Months Ended	3 Months Ended	16 Months Ended		0 Months Ended	3 Months Ended	16 Months Ended	3 Months Ended			16 Months Ended
	Jul. 31, 2008	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Nov. 05, 2013 Subsequent Event [Member]	Sep. 30, 2013 Wireless Operations [Member]	Sep. 30, 2012 Wireless Operations [Member]	Sep. 30, 2013 Wireless Operations [Member]	Sep. 30, 2012 Wireless Operations [Member]	Sep. 30, 2013 Software Operations [Member]	Sep. 30, 2012 Software Operations [Member]	Sep. 30, 2013 Software Operations [Member]	Sep. 30, 2012 Software Operations [Member]	Sep. 30, 2013 Non-executive directors [Member]	Sep. 30, 2013 Non-executive directors [Member] Restricted Stock [Member]	Jun. 30, 2013 Non-executive directors [Member] Restricted Stock [Member]	Mar. 31, 2013 Non-executive directors [Member] Restricted Stock [Member]	Dec. 31, 2012 Non-executive directors [Member] Restricted Stock [Member]	Sep. 30, 2012 Non-executive directors [Member] Restricted Stock [Member]	Jun. 30, 2012 Non-executive directors [Member] Restricted Stock [Member]	Mar. 31, 2012 Non-executive directors [Member] Restricted Stock [Member]	Dec. 31, 2011 Non-executive directors [Member] Restricted Stock [Member]	Sep. 30, 2013 Non-executive directors [Member] Restricted Stock [Member]	Sep. 30, 2013 Non-executive directors [Member] Restricted Stock [Member]	Jul. 23, 2013 Non-executive director [Member]	Aug. 01, 2007 Non-executive director [Member]	Jul. 23, 2013 Chair of the Audit Committee [Member]	Aug. 01, 2007 Chair of the Audit Committee [Member]	Jul. 23, 2013 President and Chief Executive Officer [Member] Restricted Stock Units [Member]	Jul. 23, 2013 Former Non Executive Director [Member] [Member] Restricted Stock [Member]	Apr. 26, 2013 2004 Equity Plan [Member] Restricted Stock Units [Member]	Apr. 19, 2013 2004 Equity Plan [Member] Restricted Stock Units [Member]	Sep. 30, 2013 2009 LTIP [Member]	Apr. 26, 2013 2009 LTIP [Member] Restricted Stock Units [Member]	Sep. 30, 2013 2011 LTIP [Member] Restricted Stock Units [Member]	Sep. 30, 2013 2011 LTIP [Member] Restricted Stock Units [Member]	Jun. 30, 2013 2011 LTIP [Member] Restricted Stock Units [Member]	Jan. 22, 2013 2011 LTIP [Member] Restricted Stock Units [Member] Wireless Operations [Member]	Sep. 30, 2013 2011 LTIP [Member] Restricted Stock Units [Member] Wireless Operations [Member]	Sep. 30, 2013 2011 LTIP [Member] Restricted Stock Units [Member] Wireless Operations [Member]	Sep. 30, 2013 2011 LTIP [Member] Restricted Stock Units [Member] Software Operations [Member]	Jun. 30, 2013 2011 LTIP [Member] Restricted Stock Units [Member] Software Operations [Member]	Mar. 31, 2013 2011 LTIP [Member] Restricted Stock Units [Member] Software Operations [Member]	Sep. 30, 2013 2011 LTIP [Member] Restricted Stock Units [Member] Software Operations [Member]	Jul. 23, 2013 Annually [Member] Non-executive director [Member]	Aug. 01, 2007 Annually [Member] Non-executive director [Member]	Jul. 23, 2013 Annually [Member] Chair of the Audit Committee [Member]	Aug. 01, 2007 Annually [Member] Chair of the Audit Committee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortization of stock based compensation		$ 946,000	$ 460,000	$ 2,200,000	$ 902,000			$ 700,000	$ 300,000	$ 1,500,000	$ 800,000	$ 200,000	$ 200,000	$ 700,000	$ 100,000																				$ 0
Common stock authorized		75,000,000		75,000,000
Common stock par value		$ 0.0001		$ 0.0001
Preferred stock authorized		25,000,000		25,000,000
Preferred stock par value		$ 0.0001		$ 0.0001
Common stock outstanding		21,646,075		21,646,075		21,701,353
Preferred stock outstanding		0		0		0
Stock options outstanding		0		0		0
RSU converted into common stock																																		258,730
Cash dividend and interest paid																																	1,500,000
Cash awards paid to employees																																				3,000,000
Restricted stock units awarded to CEO																	6,266	4,606	4,712	5,350	5,263	4,084	3,769	3,785	23,278	37,835					138,980						156,878			253,739		392,719	17,898	3,518	20,676	164,765
Restricted stock unit forfeitures																									2,452							2,452					22,414	126,489			2,689		19,725		2,781
Outstanding restricted stock units																																					642,582	642,582	508,118		390,030	390,030	252,552			252,552
Annual restricted stock award issued to non-executive directors																																															60,000	40,000	70,000	50,000
Annual cash compensation awarded to non-executive directors																											45,000	40,000	55,000	50,000
Annual restricted stock or common stock award issued to non-executive directors																											135,000		165,000
Grace period of restricted stock threshold																3 years
Dividends declared							2,700,000
Dividend rate							$ 0.125
Declaration date							Nov. 05, 2013
Record Date							Nov. 20, 2013
Payment Date							Dec. 10, 2013
Common Stock Repurchase Program, authorized amount	50,000,000			25,000,000
Shares acquired under common stock repurchase program		108,459		0
Common Stock Repurchase Program, remaining repurchase authorized amount				17,000,000
Increase in additional paid-in capital				1,200,000
Additional paid-in capital		$ 126,432,000		$ 126,432,000		$ 125,212,000