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Financing Costs and Additional Notes and Loans Payable Information - Additional Information (Detail) - Unsecured committed bank credit facility
1 Months Ended
Mar. 31, 2016
CAD
Financing Activities [Line Items]  
Line of credit maximum borrowing capacity CAD 500,000,000
Debt instrument, maturity date Mar. 31, 2017
Non-interest bearing, revolving demand loan, outstanding amount CAD 0