Pension Benefits - Components of Net Periodic Employee Benefit Cost (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
U.S. Plan [Member]
Defined Benefit Plan Net Periodic Benefit Cost [Line Items]
Service Cost		$ 5,250		$ 10,500
Interest Cost	53,237	42,500	116,343	85,000
Expected return on plan assets	(57,386)	(40,250)	(125,410)	(80,500)
Net actuarial loss
Amortizations	36,249	23,500	79,218	47,000
Net periodic benefit cost	32,100	31,000	70,151	62,000
Canadian Plan [Member]
Defined Benefit Plan Net Periodic Benefit Cost [Line Items]
Service Cost
Interest Cost	12,588	18,884	26,189	37,840
Expected return on plan assets	(16,929)	(20,723)	(35,219)	(41,525)
Net actuarial loss	9,019	3,429	18,764	6,871
Amortizations
Net periodic benefit cost	$ 4,678	$ 1,590	$ 9,734	$ 3,186