Acquisitions - Purchase Price Allocation for Acquisition (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Skygistics Ltd. [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	$ 383
Accounts receivable	939
Inventories	292
Other current assets	112
Property, plant and equipment	418
Deferred tax assets	105
Intangible assets	1,545
Total identifiable assets acquired	3,794
Accounts payable and accrued expenses	410
Deferred tax liabilities	433
Other liabilities	11
Total liabilities assumed	854
Net identifiable assets acquired	2,940
Goodwill	1,409
Total purchase price	4,349
WAM Technologies, LLC [Member]
Business Acquisition [Line Items]
Accounts receivable	563
Property, plant and equipment	122
Intangible assets	4,810
Total identifiable assets acquired	5,495
Accounts payable and accrued expenses	204
Deferred revenues	7,326
Total liabilities assumed	7,530
Net identifiable assets acquired	(2,035)
Goodwill	10,724
Total purchase price	8,689
InSync Software, Inc [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	288
Accounts receivable	1,141
Other current assets	204
Property, plant and equipment	51
Deferred tax assets	2,342
Intangible assets	5,788
Other noncurrent assets	55
Total identifiable assets acquired	9,869
Accounts payable and accrued expenses	1,080
Deferred revenues	296
Deferred tax liabilities	2,342
Total liabilities assumed	3,718
Net identifiable assets acquired	6,151
Goodwill	5,491
Total purchase price	11,642
SkyWave Mobile Communications Inc. [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	110
Accounts receivable	13,898
Inventories	1,335
Other current assets	2,180
Property, plant and equipment	4,769
Intangible assets	67,214
Other noncurrent assets	6,108
Total identifiable assets acquired	95,614
Accounts payable and accrued expenses	9,987
Deferred revenues	1,070
Deferred tax liabilities	17,527
Other liabilities	1,168
Total liabilities assumed	29,752
Net identifiable assets acquired	65,862
Goodwill	56,511
Total purchase price	122,373
Euroscan Holding B.V. [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	280
Accounts receivable	2,997
Inventories	1,385
Other current assets	540
Property, plant and equipment	324
Intangible assets	17,400
Other noncurrent assets	543
Total identifiable assets acquired	23,469
Accounts payable and accrued expenses	2,614
Deferred revenues	44
Deferred tax liabilities	4,558
Total liabilities assumed	7,216
Net identifiable assets acquired	16,253
Goodwill	19,952
Total purchase price	$ 36,205