Property, Plant and Equipment - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
---|---|---|---|
Mar. 31, 2015
|
Mar. 31, 2014
|
Mar. 31, 2013
|
|
Property, Plant and Equipment [Abstract] | |||
Depreciation expense | $ 2,079 | $ 1,977 | $ 1,851 |