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Commitments and Contingencies (Details Textual)
12 Months Ended
Nov. 06, 2012
CAD
Nov. 05, 2012
CAD
Aug. 03, 2012
CAD
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
CAD
Loss Contingencies [Line Items]                
Rental expense for facilities and equipment leases | $       $ 2,400,000   $ 2,400,000 $ 2,000,000  
Litigation Settlement, Amount Awarded to Other Party         CAD 10,000,000      
Litigation Settlement, Expense       $ 4,000,000 CAD 5,000,000 0 0  
Percentage of defense costs which will be covered by insurance       50.00% 50.00%      
Insurance proceeds | $       $ 276,000   430,000 $ 335,000  
Loss contingency, receivable | $       $ 212,000   $ 186,000    
First Lawsuit By A G F                
Loss Contingencies [Line Items]                
Lawsuit filing date       On August 3, 2012, AGF Management Limited and AGF Investments Inc. (together “AGF”) filed a lawsuit in the Ontario Superior Court of Justice against Westwood, certain Westwood employees and the executive recruiting firm of Warren International, LLC ("Warren"). On August 3, 2012, AGF Management Limited and AGF Investments Inc. (together “AGF”) filed a lawsuit in the Ontario Superior Court of Justice against Westwood, certain Westwood employees and the executive recruiting firm of Warren International, LLC ("Warren").      
Litigation claim for damages     CAD 10,000,000          
Second Lawsuit by AGF                
Loss Contingencies [Line Items]                
Lawsuit filing date       On November 6, 2012, AGF filed a second lawsuit against Westwood, Westwood Management and an employee of a Westwood subsidiary On November 6, 2012, AGF filed a second lawsuit against Westwood, Westwood Management and an employee of a Westwood subsidiary      
General Damage                
Loss Contingencies [Line Items]                
Litigation claim for damages   CAD 1,000,000            
General Damage | Second Lawsuit by AGF                
Loss Contingencies [Line Items]                
Litigation claim for damages CAD 5,000,000              
Special Damage                
Loss Contingencies [Line Items]                
Litigation claim for damages   10,000,000            
Punitive Damage                
Loss Contingencies [Line Items]                
Litigation claim for damages   CAD 1,000,000            
Punitive Damage | Second Lawsuit by AGF                
Loss Contingencies [Line Items]                
Litigation claim for damages CAD 1,000,000              
Insurance Settlement [Member]                
Loss Contingencies [Line Items]                
Loss contingency, receivable       $ 4,000,000       CAD 5,000,000