Accrued contingent consideration amount current.

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Business combination decrease contingent consideration earn-out.

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Collaborative arrangement date of agreement.

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Consideration paid in cash and common stock upon achievement of operational milestone.

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Contingent consideration amount non current.

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Contingent consideration related to acquisitions payable to affiliates.

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Selected discount rate to reflect risk characteristics of intangible assets.

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- Definition

Represents the number of customer accounts.

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Number of trading days for average closing price.

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Potential contingent consideration payable in connection with business combination.

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- Definition

Purchase price cash consideration amount deposited in escrow.

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- Definition

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Number of shares of equity interests issued or issuable to acquire entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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Liability for an extended product warranty acquired in a business acquisition. Does not include any liability for a standard warranty acquired in a business acquisition.

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Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands				3 Months Ended			9 Months Ended
	Jun. 09, 2017 USD ($) $ / shares shares	May 26, 2016 USD ($) Customer	Mar. 11, 2014 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) Customer	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2017 USD ($) Customer	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)
Business Acquisition [Line Items]
Acquisition-related contingent consideration at fair value				$ 9,835			$ 9,835		$ 514
Portion of contingent consideration in accrued expenses								$ 1,174
Inthinc [Member]
Business Acquisition [Line Items]
Cash consideration paid	$ 34,236
Number of common stock shares issued for consideration \| shares	76,796
Common stock issued, per share \| $ / shares	$ 9.95
Number of trading days for average closing price	20 days
Acquisition effective date							Jun. 09, 2017
Total consideration of preliminary purchase price	$ 44,835
Acquisition-related contingent consideration at fair value	9,835
Increase (decrease) in goodwill							$ (4,403)
Additional product liabilities obligations assumed through acquisition	$ 1,333
Portion of contingent consideration in other non-current liabilities				9,040			9,040
Reduction in fair value of earn-outs amounts				795			795
Inthinc [Member] \| Indemnification Asset [Member]
Business Acquisition [Line Items]
Amount deposited in escrow to fund any indemnification obligations				$ 500			$ 500
Inthinc [Member] \| Customer Lists and Technology [Member]
Business Acquisition [Line Items]
Discount rate to reflect risk characteristics of intangible assets	12.00%
Inthinc [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Contingent consideration payable	$ 25,000
Inthinc [Member] \| Minimum [Member] \| Enterprises and Industrial Companies [Member]
Business Acquisition [Line Items]
Number of customers \| Customer				100			100
Skygistics Ltd. [Member]
Business Acquisition [Line Items]
Cash consideration paid		$ 3,835
Acquisition effective date							May 26, 2016
Reduction in fair value of earn-outs amounts						$ 519
Arrangement Agreement date							Apr. 11, 2016
Skygistics Ltd. [Member] \| Telematics And Enterprise Customers [Member]
Business Acquisition [Line Items]
Number of customers \| Customer		250
Skygistics Ltd. [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Contingent consideration payable		$ 954
Euroscan Holding B.V. [Member]
Business Acquisition [Line Items]
Cash consideration paid			$ 29,163
Number of common stock shares issued for consideration \| shares			291,230
Common stock issued, per share \| $ / shares			$ 7.70
Acquisition effective date							Mar. 11, 2014
Outstanding equity percentage			100.00%
Portion of contingent consideration in accrued expenses								$ 655
Euroscan Holding B.V. [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Contingent consideration payable			$ 6,547
MWL Management B.V. and R.Q. Management B.V [Member]
Business Acquisition [Line Items]
Total consideration paid in cash common stock upon achievement of operational milestone					$ 694