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Discontinued Operations - Analysis of Assets and Liabilities Reclassified as Held for Sale (Detail) - USD ($) $ in Thousands		12 Months Ended
	Aug. 12, 2018	Dec. 31, 2018	Dec. 31, 2017
Discontinued Operations And Disposal Groups [Abstract]
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Current assets:
Accounts receivable-trade, net	$ 3,360		$ 5,266
Inventories, net	1,145		1,325
Contract assets	2,957		5,841
Prepaid expenses and other current assets	117		434
Total current portion of assets held for sale	7,579		12,866
Property, plant and equipment, net	5,937		6,323
Intangibles	497		458
Retainage receivables			785
Total non-current assets held for sale	6,506		7,566
Total assets held for sale	14,013		20,432
Current liabilities:
Accounts payable and accrued liabilities	5,664		11,616
Short-term note payable			150
Contract liabilities	$ 2,752		1,792
Total liabilities held for sale			$ 13,558

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