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Stock Based Compensation and Stock Options - Stock Compensation Expense for Time Based Options and Performance Based Options (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of stock-based compensation included in income before income tax provision			$ 1,594,000	$ 1,546,000
Effect on diluted net income per share	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 1.10us-gaap_EarningsPerShareDiluted	$ 1.22us-gaap_EarningsPerShareDiluted
Performance Based Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of stock-based compensation included in income before income tax provision	(30,000)	285,000	113,000	448,000
Time Based Options [Member] \| Performance Based Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of stock-based compensation included in income before income tax provision	432,000	676,000	1,594,000	1,546,000
Amount of income tax benefit recognized	(164,000)	(267,000)	(606,000)	(611,000)
Amount charged against net income	268,000	409,000	988,000	935,000
Effect on diluted net income per share	$ (0.01)	$ (0.02)	$ (0.05)	$ (0.04)
Time Based Options [Member] \| Performance Based Options [Member] \| Cost of revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of stock-based compensation included in income before income tax provision	239,000	180,000	733,000	477,000
Time Based Options [Member] \| Performance Based Options [Member] \| General and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of stock-based compensation included in income before income tax provision	$ 193,000	$ 496,000	$ 861,000	$ 1,069,000

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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