Long-Term Debt Payable to Banks - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2012
Line of Credit Facility [Line Items]
Senior credit facility	$ 33,000
Senior credit facility period	60 months
Quarterly principal payments	821
Maturity payment	6,571
Term-loan prepayments	10,679
Senior Credit Facility blended interest rate	1.50%
Debt tied to LIBOR	10,500
Debt tied to Prime Rate	179
Unused borrowing commitment fee	0.375%
Senior Credit Facility Base Rate calculation	Higher of the Prime Rate or the Federal Funds Open Rate plus 0.50%
Senior Credit Facility margin	0.50%
Outstanding letters of credit	202
Revolver availability	9,798
Fixed charge coverage ratio, Minimum	Not less than 1.25 1.0
Fixed charge leverage ratio, Maximum	Not more than 2.5 1.0
One-time capital expenditures	5,500
Amount required to enter into an interest rate swap	not less than 50% of the term loan for the first two years and 35% of the term loan for the third year
Percentage of term loan to be entered into an interest rate swap during first two years	50.00%
Percentage of term loan to be entered into an interest rate swap during third year	35.00%
Fixed rate on interest rate swap	3.25%
Floating rate period	30 day LIBOR
Years required to enter into an interest rate swap	3 years
Revolver [Member]
Line of Credit Facility [Line Items]
Senior credit facility	10,000
Senior Credit Facility [Member]
Line of Credit Facility [Line Items]
Senior credit facility	$ 23,000
Minimum [Member]
Line of Credit Facility [Line Items]
Applicable margins for Base Rate based borrowings	0.00%
Applicable margins for LIBOR-based borrowings	1.25%
Maximum [Member]
Line of Credit Facility [Line Items]
Applicable margins for Base Rate based borrowings	0.75%
Applicable margins for LIBOR-based borrowings	2.25%