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Fair Value Measurements - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Mar. 31, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Contingent liability $ 758 $ 238 $ 841
Change in contingent liability $ 238