Annual report pursuant to Section 13 and 15(d)

The Company and Its Accounting Policies - Summary of Costs and Estimated Earnings on Contracts (Detail)

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The Company and Its Accounting Policies - Summary of Costs and Estimated Earnings on Contracts (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Accounting Policies [Abstract]    
Costs incurred since inception on contracts in progress $ 43,806 $ 44,263
Estimated earnings since inception on contracts in progress 8,123 4,348
Costs and estimated earnings 51,929 48,611
Less billings to date 67,172 52,410
Net under (over) billings $ (15,243) $ (3,799)