Pension Benefits - Fair Value Hierarchy of Plan Assets (Detail) (USD $)	Jun. 30, 2013
U.S. Plan [Member]
Defined Benefit Plan Funded Status Of Plan [Line Items]
Fair value of plan assets	$ 2,157,666
U.S. Plan [Member] | Level 1 [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Funded Status Of Plan [Line Items]
Fair value of plan assets	94,009
U.S. Plan [Member] | Level 1 [Member] | Mutual funds [Member]
Defined Benefit Plan Funded Status Of Plan [Line Items]
Fair value of plan assets	270,462
U.S. Plan [Member] | Level 1 [Member] | Corporate/Government Bonds [Member]
Defined Benefit Plan Funded Status Of Plan [Line Items]
Fair value of plan assets	745,822
U.S. Plan [Member] | Level 1 [Member] | Equities [Member]
Defined Benefit Plan Funded Status Of Plan [Line Items]
Fair value of plan assets	1,047,373
Canadian Plan [Member]
Defined Benefit Plan Funded Status Of Plan [Line Items]
Fair value of plan assets	1,296,318
Canadian Plan [Member] | Level 1 [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Funded Status Of Plan [Line Items]
Fair value of plan assets	11,440
Canadian Plan [Member] | Level 1 [Member] | Mutual funds [Member]
Defined Benefit Plan Funded Status Of Plan [Line Items]
Fair value of plan assets	1,284,878
Canadian Plan [Member] | Level 1 [Member] | Corporate/Government Bonds [Member]
Defined Benefit Plan Funded Status Of Plan [Line Items]
Fair value of plan assets
Canadian Plan [Member] | Level 1 [Member] | Equities [Member]
Defined Benefit Plan Funded Status Of Plan [Line Items]
Fair value of plan assets