Quarterly report pursuant to Section 13 or 15(d)

Inventories - Major Classifications of Inventories (Detail)

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Inventories - Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 3,034 $ 3,016
Work in process 9,334 12,573
Finished products 935 891
Inventory Gross 13,303 16,480
Less - progress payments 4,404 7,234
Total $ 8,899 $ 9,246