Acquisitions - Additional Information (Detail)	3 Months Ended					3 Months Ended									3 Months Ended						3 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2014 EUR (€)	Mar. 31, 2013 USD ($)	Feb. 14, 2014	Dec. 31, 2013	Mar. 31, 2014 Minimum [Member] USD ($)	Mar. 31, 2014 Maximum [Member] USD ($)	Mar. 31, 2014 Euroscan Holdings B.V. [Member] USD ($)	Mar. 31, 2014 Euroscan Holdings B.V. [Member] EUR (€)	Mar. 31, 2014 SENS [Member] USD ($)	Mar. 31, 2014 GlobalTrak [Member] USD ($)	Mar. 31, 2014 GlobalTrak [Member] EUR (€)	Oct. 31, 2013 GlobalTrak [Member] USD ($)	Oct. 31, 2013 GlobalTrak [Member] EUR (€)	Mar. 31, 2014 MobileNet [Member] USD ($)	Mar. 31, 2014 MobileNet [Member] Second Condition [Member]	Mar. 31, 2014 MobileNet [Member] First Condition [Member]	Mar. 31, 2014 LMS [Member] USD ($)	Mar. 31, 2014 StarTrak [Member]	Mar. 31, 2014 Warranty Obligations [Member]	Mar. 31, 2014 Relating to Fuel Sensor [Member] USD ($)
Business Acquisition [Line Items]
Outstanding equity percentage								100.00%	100.00%
Acquisition effective date								Mar. 11, 2014	Mar. 11, 2014	Oct. 01, 2013	Apr. 03, 2013				Apr. 01, 2013
Aggregate consideration payable in cash and common stock								$ 29,185	€ 21,000
Cash								29,163,000	20,999,000	1,978,000					3,231,000
Cash consideration placed in escrow with third party									1,000,000
Initial working capital estimate								2,220,000	1,599,000
Number of common stock shares issued for consideration								291,230	291,230
Amount of common stock shares issued for consideration								2,242,000	1,600
Common stock issued, per share								$ 7.70
Contingent consideration payable	4,800,000							6,547,000	4,714,000
Discount rate to reflect risk characteristics of intangible assets								17.50%	17.50%	43.00%
Internal Revenue service remains open period	8 months 15 days	8 months 15 days
Minimum Undiscounted range of potential payments under business combination	0
Maximum Undiscounted range of potential payments under business combination	2,778,000
Gross profit target earn-outs						0	2,083,000
Business combination earnout milestone amount						0	1,686,000
Fair value of the contingent earn-out	4,800,000
Portion of earn-out in accrued liabilities	1,056,000																	25,000
Portion of earn-out in other liabilities	3,744,000														0			191,000
Escrow deposit increase decrease		250,000
Gross profit earn-outs						0.50%	1.50%
Amount deposited in escrow account											500,000	1,000,000
Escrow disbursement agreement											one-half of the $500, less the aggregate amount of claims made by the Company against SPC six months from April 3, 2013
Escrow amount to be released													250,000	250,000
Goodwill change in amount due to acquisition											250,000
Common stock, shares issued	55,211,327	55,211,327			48,216,480			291,230	291,230						329,344
Common stock issued, per share								$ 7.70							$ 4.96
Working capital adjustment															28,000
Shares deposited into escrow account				166,611											164,672				166,611
Period for amount kept in escrow account	Up to fifteen months	Up to fifteen months													Up to fifteen months
Earn-out payment															2,000,000
Earn-out payment percentage																35.00%	50.00%
Earn-out amounts paid in company's common stock															50.00%
Average closing price of prior to the last trading day															20 days
Potential earn-out amount payment, description															Contingent consideration payable by the Company to MobileNet if service revenues attributable to the MobileNet business for either of the two one year earn-out periods May 1, 2013 through April 30, 2014 and May 1, 2014 through April 30, 2015 are in excess of the specified baseline amount.
Reduction in liability															Achievement below certain thresholds will reduce the liability to zero.
Discount percentage	19.00%	19.00%													18.00%
Changes in fair value of earn-out amounts															0
Consideration paid for contingent payments based on achieving sales targets																		950,000
Result of lower sales targets achievement than the targets																		950,000
Decreased in fair value of earn-out amounts																		8,000
Warranty coverage on accrued product	1 year	1 year																	1 year
Coverage percentage of certain costs relating to fuel sensor warranty obligations																				50.00%
Minimum amount of warranty expenses and fuel sensors to issue notice																					600,000
Percentage of the fuel sensor damages for the calculation of number of shares issuable to escrow agent	50.00%	50.00%
Common stock share issued valued at per share																					$ 3.001
Portion of earn-out in other liabilities																					0
Gain on fair value of common stock	691,000		126,000
Reduction in selling, general and administrative expenses	$ 0		$ 0