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Acquisitions and Divestitures - Additional Information (Details)
 3 Months Ended 12 Months Ended
Mar. 15, 2017
shares
Sep. 29, 2016
USD ($)
Sep. 21, 2016
USD ($)
Apr. 11, 2016
USD ($)
Jan. 05, 2016
USD ($)
installment
shares
Oct. 05, 2015
USD ($)
Jun. 18, 2015
ZAR (R)
R / shares
Mar. 27, 2015
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]                          
Non-cash change in acquisition-related escrow                     $ 0 $ 0 $ (8,286,000)
Acquisition-related earn out                     13,186,000 7,912,000  
Measurement-period adjustment to goodwill                       195,000  
Impairment of purchased intangible assets                     0 2,594,000 0
Proceeds related to recent or pending divestitures     $ 50,000,000               0 11,300,000 $ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations                          
Business Acquisition [Line Items]                          
Purchase consideration for recent or pending divestitures   $ 11,700,000   $ 11,000,000                  
Proceeds related to recent or pending divestitures   11,300,000   9,000,000                  
Other receivables   2,100,000                      
Liabilities settled   $ 400,000                      
Gain recognized during the period                     45,000 5,000,000  
Certain Transition Services                          
Business Acquisition [Line Items]                          
Other receivables       $ 1,000,000                  
Contingent consideration payout period       2 years                  
Satisfaction Of Certain Conditions                          
Business Acquisition [Line Items]                          
Other receivables       $ 1,000,000                  
Purchase Of Module Product Inventory                          
Business Acquisition [Line Items]                          
Other receivables       3,800,000                  
Purchase Of Module Product Inventory - Certain Transition Services                          
Business Acquisition [Line Items]                          
Other receivables       $ 1,000,000                  
Contingent consideration payout period       2 years                  
DigiCore/Ctrack                          
Business Acquisition [Line Items]                          
Voting interests acquired             100.00%            
Acquisition share price (Rand per share) | R / shares             R 4.40            
Cash consideration                 $ 79,365,000        
Non-cash change in acquisition-related escrow                       (8,300,000)  
Total purchase price           $ 80,000,000     79,988,000        
Equity consideration                 $ 623,000        
Accrued and other liabilities           $ 15,018,000              
DigiCore/Ctrack | General and administrative expense                          
Business Acquisition [Line Items]                          
Acquisition costs                       1,700,000  
FW                          
Business Acquisition [Line Items]                          
Cash consideration               $ 9,300,000   $ 9,268,000      
Total purchase price               24,800,000   24,777,000      
Purchase consideration placed in escrow fund         $ 1,500,000     1,500,000          
Other assumed liabilities               500,000   509,000      
Equity consideration               15,000,000   $ 15,000,000      
Maximum contingent consideration               25,000,000          
Number of cash installments | installment         5                
Period for cash installments         4 years                
Issuable to former shareholders (shares) | shares         2,900,000                
Number of share installments | installment         3                
Period for share installments         3 years                
Contingent liability expense                     7,900,000    
Stock issued during period, shares, acquisitions (in shares) | shares 973,334                        
Accrued and other liabilities               $ 1,916,000       200,000  
Measurement-period adjustment to goodwill                       200,000  
FW | Developed technologies                          
Business Acquisition [Line Items]                          
Impairment of purchased intangible assets                     2,600,000    
FW | General and administrative expense                          
Business Acquisition [Line Items]                          
Acquisition costs                       $ 900,000  
Other Liabilities | FW | Deferred Purchase Price                          
Business Acquisition [Line Items]                          
Acquisition-related earn out                     11,300,000    
Other Liabilities | FW | Earn-Out                          
Business Acquisition [Line Items]                          
Acquisition-related earn out                     $ 9,800,000    
Scenario, Plan | Maximum | DigiCore/Ctrack                          
Business Acquisition [Line Items]                          
Cash consideration | R             R 1,094,223,363