Outstanding Compensatory Stock Options (Detail) (CAD)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Number of Shares	8,955,002	8,881,668
Options Outstanding Remaining Contractual Life (in years)	3 years 1 month 6 days
Options Outstanding Weighted Average Exercise Price	1.32	1.36
Options Exercisable Number Exercisable	7,381,668	6,860,000
Options Exercisable Weighted Average Exercise Price	1.19
Options Exercisable Aggregate Intrinsic Value	2,959,368
Range One
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, Lower Range	0.95
Exercise Prices, Upper Range	2.34
Options Outstanding Number of Shares	3,953,334
Options Outstanding Remaining Contractual Life (in years)	4 years 2 months 12 days
Options Outstanding Weighted Average Exercise Price	1.85
Options Exercisable Number Exercisable	2,496,667
Options Exercisable Weighted Average Exercise Price	1.73
Options Exercisable Aggregate Intrinsic Value	276,667
Range Two
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, Lower Range	0.58
Exercise Prices, Upper Range	0.71
Options Outstanding Number of Shares	2,221,668
Options Outstanding Remaining Contractual Life (in years)	3 years
Options Outstanding Weighted Average Exercise Price	0.61
Options Exercisable Number Exercisable	2,105,001
Options Exercisable Weighted Average Exercise Price	0.61
Options Exercisable Aggregate Intrinsic Value	1,548,851
Range Three
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, Lower Range	0.56
Exercise Prices, Upper Range	0.86
Options Outstanding Number of Shares	1,815,000
Options Outstanding Remaining Contractual Life (in years)	1 year 10 months 24 days
Options Outstanding Weighted Average Exercise Price	0.73
Options Exercisable Number Exercisable	1,815,000
Options Exercisable Weighted Average Exercise Price	0.73
Options Exercisable Aggregate Intrinsic Value	1,133,850
Range Four
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, Lower Range	2.00
Exercise Prices, Upper Range	3.36
Options Outstanding Number of Shares	965,000
Options Outstanding Remaining Contractual Life (in years)	10 months 24 days
Options Outstanding Weighted Average Exercise Price	2.40
Options Exercisable Number Exercisable	965,000
Options Exercisable Weighted Average Exercise Price	2.40