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Accounts receivable (Details) (CAD)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Receivables [Abstract]      
Accounts receivable – trade 59,309,000 118,509,000  
Accounts receivable – holdbacks 9,055,000 33,352,000  
Income and other taxes receivable 12,000 420,000  
Accounts receivable – other 1,801,000 714,000  
Allowance for doubtful accounts (note 16(d)) 0 (185,000) (210,000)
Total accounts receivable 70,177,000 152,810,000  
Accounts receivable – holdback percentage 10.00%    
Accounts receivable – holdbacks, noncurrent 0 2,597,000