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
Jun. 30, 2017
Mar. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 2,936 $ 3,016
Work in process 9,351 12,573
Finished products 997 891
Inventory Gross 13,284 16,480
Less - progress payments 5,375 7,234
Total $ 7,909 $ 9,246