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Financial instruments and risk management - Trade receivables (Details) (CAD) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Not past due	59,337	81,752
Past due 1-30 days	3,948	38,487
Past due 31-60 days	1,538	14,142
More than 61 days	3,541	17,480
Total	68,364	151,861
Percentage of allowance for doubtful accounts that are more than 61 days past due	100.00%
Allowance for Doubtful Accounts Receivable [Roll Forward]
Opening balance	185	210
Payments received on provided balances	0	(1)
Current year allowance	365	0
Write-offs	0	(24)
Ending balance	0	185
Allowance for Doubtful Accounts Receivable, Discontinued Operations	(550)	0

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Accounts Receivable, 1 to 30 Days Past Due

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Allowance for Doubtful Accounts Receivable, Percentage of Allowance Over Sixty-one Days Past Due

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Amount of direct write-downs of accounts receivable charged against the allowance.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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