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Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]      
Intangible amortization expense $ 0.6us-gaap_AmortizationOfIntangibleAssets $ 0.8us-gaap_AmortizationOfIntangibleAssets $ 0.9us-gaap_AmortizationOfIntangibleAssets