Derivative Financial Instruments - Summary of Outstanding Interest Rate Derivatives Designated as Cash Flow Hedges of Interest Rate Risk (Detail) - Cash Flow Hedges [Member] - Designated as Hedging Instrument [Member] - CAD [Member] - CDOR [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2020 CAD ($) DerivativeInstrument	Dec. 31, 2019 CAD ($) DerivativeInstrument
Interest Rate Caps [Member]
Derivative [Line Items]
Number of Instruments | DerivativeInstrument	2	1
Notional Amount | $	$ 38,293	$ 21,387
Strike	1.00%	3.00%
Wtd. Avg. Maturity (Years)	9 months 18 days	1 year
Interest Rate Swaps [Member]
Derivative [Line Items]
Number of Instruments | DerivativeInstrument		2
Notional Amount | $		$ 17,273
Strike		1.00%
Wtd. Avg. Maturity (Years)		8 months 12 days