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Goodwill and intangible assets (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
CAD ($)
Sep. 30, 2017
CAD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CAD ($)
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       $ 203,310,000    
Intangible assets, end of year $ 70,012,000     70,012,000   $ 203,310,000
Cost [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       366,753,000   374,379,000
Effect of movements in exchange rates       (15,757,000)   (7,626,000)
Intangible assets, end of year 350,996,000     350,996,000   366,753,000
Accumulated amortization [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       163,443,000   157,249,000
Amortization charge       6,723,000   9,414,000
Impairment charge       118,549,000    
Effect of movements in exchange rates       (7,731,000)   (3,220,000)
Intangible assets, end of year 280,984,000     280,984,000   163,443,000
Goodwill [Member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       118,664,000    
Intangible assets, end of year 0     0   118,664,000
Goodwill [Member] | Cost [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       118,664,000   122,314,000
Effect of movements in exchange rates       (7,265,000)   (3,650,000)
Intangible assets, end of year 111,399,000     111,399,000   118,664,000
Goodwill [Member] | Accumulated amortization [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       0   0
Amortization charge       0   0
Impairment charge       111,399,000    
Effect of movements in exchange rates       0   0
Intangible assets, end of year 111,399,000     111,399,000   0
Goodwill [Member] | Accumulated amortization [member] | Nukem [Member]            
Reconciliation of carrying amount [Line Items]            
Impairment charge   $ 111,399,000 $ 88,377,000      
Contracts [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       7,249,000    
Intangible assets, end of year 4,873,000     4,873,000   7,249,000
Contracts [member] | Cost [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       117,533,000   121,148,000
Effect of movements in exchange rates       (7,721,000)   (3,615,000)
Intangible assets, end of year 109,812,000     109,812,000   117,533,000
Contracts [member] | Accumulated amortization [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       110,284,000   108,809,000
Amortization charge       2,002,000   4,613,000
Impairment charge       0    
Effect of movements in exchange rates       (7,347,000)   (3,138,000)
Intangible assets, end of year 104,939,000     104,939,000   110,284,000
Contracts [member] | Accumulated amortization [member] | Nukem [Member] | 2018 [Member]            
Reconciliation of carrying amount [Line Items]            
Amortization charge         $ 998,000  
Intellectual Property [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       69,230,000    
Intangible assets, end of year 65,139,000     65,139,000   69,230,000
Intellectual Property [member] | Cost [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       118,819,000   118,819,000
Effect of movements in exchange rates       0   0
Intangible assets, end of year 118,819,000     118,819,000   118,819,000
Intellectual Property [member] | Accumulated amortization [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       49,589,000   45,430,000
Amortization charge       4,091,000   4,159,000
Impairment charge       0    
Effect of movements in exchange rates       0   0
Intangible assets, end of year 53,680,000     53,680,000   49,589,000
Patents [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       8,167,000    
Intangible assets, end of year 0     0   8,167,000
Patents [member] | Cost [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       11,737,000   12,098,000
Effect of movements in exchange rates       (771,000)   (361,000)
Intangible assets, end of year 10,966,000     10,966,000   11,737,000
Patents [member] | Accumulated amortization [member]            
Reconciliation of carrying amount [Line Items]            
Intangible assets, beginning of year       3,570,000   3,010,000
Amortization charge       630,000   642,000
Impairment charge       7,150,000    
Effect of movements in exchange rates       (384,000)   (82,000)
Intangible assets, end of year 10,966,000     $ 10,966,000   $ 3,570,000
Patents [member] | Accumulated amortization [member] | UFP Investments LLC [Member]            
Reconciliation of carrying amount [Line Items]            
Impairment charge $ 7,150,000