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Acquisition - Summary of Consideration Allocated to Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jul. 31, 2017
Business Acquisition [Line Items]    
Goodwill $ 68,500  
Staging Concepts Acquisition, LLC [Member]    
Business Acquisition [Line Items]    
Accounts receivable, net   $ 8,357
Contract retainage   1,948
Inventories, net   2,344
Prepaid expenses and other assets   1,223
Revenues in excess of billings   3,463
Fixed assets, net   1,264
Intangible assets   4,900
Goodwill   57,938
Accounts payable   (3,990)
Accrued liabilities and other expenses   (2,329)
Billings in excess of revenues   (1,752)
Customer deposits   (1,562)
Total consideration   $ 71,804