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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Revenues |  | $ 121,195 | $ 129,453
Sales revenues |  | (15,439) | (15,436)
Sales [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales revenues |  | (14,611) | (14,366)
Enviroplex [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | [1] | 1,234 | 1,503
Sales revenues | [1] | (1,234) | (1,503)
Mobile Modular [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues |  | 68,648 | 73,198
Sales revenues |  | (7,940) | (7,644)
Operating Segments [Member] | Enviroplex [Member] | Sales [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues |  | 2,090 | 2,778
Inter-segment Eliminations [Member] | Mobile Modular [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales revenues |  | $ 856 | $ 1,275
Type of Revenue [Extensible List] |  | Sales [Member] | Sales [Member]
[1] | Gross Enviroplex sales revenues were $2,090 and $2,778 for the three months ended March 31, 2021 and 2020, respectively. There were $856 and $1,275 inter-segment sales to Mobile Modular in the three months ended March 31, 2021 and 2020, respectively, which required elimination in consolidation.

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