Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) (USD $)	Mar. 31, 2014	Mar. 31, 2013
Deferred income tax assets:
Accrued liabilities not currently deductible	$ 6,672,000	$ 5,075,000
Allowance for doubtful accounts	692,000	918,000
Stock-based compensation	717,000	925,000
Other	2,222,000	805,000
Deferred assets	10,303,000	7,723,000
Deferred income tax liabilities:
Excess of book over tax basis of fixed assets	(14,409,000)	(14,277,000)
Intangible assets	(4,934,000)	(4,728,000)
Other	(218,000)	(495,000)
Deferred liabilities	(19,561,000)	(19,500,000)
Net deferred tax asset/(liability)	$ (9,258,000)	$ (11,777,000)