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Stock Options and Stock-Based Compensation - Stock Compensation Expense for Time Based Options and Performance Based Options (Detail) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Effect on basic earnings per share	$ 0.27us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ 0.38us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.42us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 1.38us-gaap_EarningsPerShareBasic	$ 1.63us-gaap_EarningsPerShareBasic	$ 1.20us-gaap_EarningsPerShareBasic
Effect on diluted earnings per share	$ 0.27us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 1.37us-gaap_EarningsPerShareDiluted	$ 1.61us-gaap_EarningsPerShareDiluted	$ 1.19us-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									$ 211,000	$ 630,000	$ (82,000)
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									2,209,000	2,140,000	997,000
Amount of income tax benefit recognized									862,000	835,000	395,000
Amount charged to net income									1,347,000	1,305,000	602,000
Effect on basic earnings per share									$ 0.07	$ 0.06	$ 0.03
Effect on diluted earnings per share									$ 0.06	$ 0.06	$ 0.03
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									1,021,000	672,000	461,000
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									$ 1,188,000	$ 1,468,000	$ 536,000

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

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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