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Costs incurred and estimated earnings net of billings on uncompleted contracts (Details) (CAD)
Dec. 31, 2013
Dec. 31, 2012
Costs in excess of billings [Abstract]    
Costs incurred and estimated earnings on uncompleted contracts 533,837,000 404,323,000
Less billings to date (508,026,000) (367,378,000)
Costs in excess of billings on uncompleted contracts 25,811,000 36,945,000
Contracts receivable [Abstract]    
Unbilled revenue 32,168,000 80,223,000
Billings in excess of costs incurred and estimated earnings on uncompleted contracts (6,357,000) (9,755,000)
Unbilled contracts receivable 25,811,000 70,468,000
Unbilled revenue related to discontinued operations 0 33,523,000
Long-term unbilled revenue 14,381,000 16,733,000