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Summary of Certain Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule Of Accounting Policies [Line Items]
Non-time and material jobs of short term nature duration description	less than one month
Cost and estimated earnings in excess of billings on uncompleted contracts	$ 1,419	$ 592
Order backlog	2,100	2,200
Refinancing of outstanding loans used as working capital		1,000
Continuing Operations
Schedule Of Accounting Policies [Line Items]
Cost and estimated earnings in excess of billings on uncompleted contracts	1,400	$ 600
Discontinued Operations | Held-for-sale
Schedule Of Accounting Policies [Line Items]
Cost and estimated earnings in excess of billings on uncompleted contracts	$ 2,000		$ 5,800

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
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