Acquisitions - Purchase Price Allocation for Acquisition (Detail) - Inthinc [Member] $ in Thousands	Jun. 09, 2017 USD ($)
Business Acquisition [Line Items]
Accounts receivable	$ 2,839
Inventories	906
Prepaid expenses and other current assets	112
Property, plant and equipment	258
Lease receivable	5,812
Intangible assets	24,300
Total identifiable assets acquired	34,227
Accounts payable	5,514
Accrued expenses	7,238
Other current and non-current liabilities	4
Total liabilities assumed	12,756
Net identifiable assets acquired	21,471
Goodwill	23,364
Total preliminary purchase price	$ 44,835