Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Original Classification Under Ias 39 and the New Classification Under Ifrs 9 for Each of the Company's Financial Assets and Financial Liabilities (Detail)

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Summary of Significant Accounting Policies - Summary of Original Classification Under Ias 39 and the New Classification Under Ifrs 9 for Each of the Company's Financial Assets and Financial Liabilities (Detail)
 12 Months Ended
Dec. 31, 2018
CDN Accounts payable and accrued liability [member]  
Disclosure of voluntary change in accounting policy [line items]  
IAS 39 Classification Other financial liabilities
IFRS 9 Amortized Cost
Cash and cash equivalents [member]  
Disclosure of voluntary change in accounting policy [line items]  
IAS 39 Classification Loans and receivables
IFRS 9 Amortized cost
Amounts receivable [member]  
Disclosure of voluntary change in accounting policy [line items]  
IAS 39 Classification Loans and receivables
IFRS 9 Amortized cost