Profit Sharing Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Service period of employees to fully vest in plan	6 years
Defined Contribution Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Maximum annual contribution percentage to defined contribution plan for eligible employees	15.00%
Expenses related to defined contribution plans	$ 210,000	$ 208,500
Defined Contribution 401 K Plan
Defined Benefit Plan Disclosure [Line Items]
Company contributions to defined contribution plan	$ 59,000	$ 60,000
Defined contribution plan service period for eligibility	1 year