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Acquisition - Summary of Estimated Consideration Allocated on a Preliminary Basis to Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Business Acquisition [Line Items] |  |
Goodwill | $ 68,461 | $ 10,523
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 |

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