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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  | $ 173,562,000 | $ 143,147,000 | $ 423,009,000 |  | $ 365,215,000 |
Sales revenues |  |  |  | (84,613,000) |  | (70,735,000) |
Sales [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Sales revenues |  | (50,855,000) | (36,085,000) | (81,387,000) |  | (67,722,000) |
Enviroplex [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  | 28,361,000 | 14,102,000 | 32,238,000 | [1] | 19,831,000 | [1]
Sales revenues | [1] |  |  | (32,238,000) |  | (19,831,000) |
Mobile Modular [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  | $ 86,302,000 | $ 74,891,000 | 219,116,000 |  | 188,613,000 |
Sales revenues |  |  |  | (32,434,000) |  | (31,667,000) |
Operating Segments [Member] | Enviroplex [Member] | Sales [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  | 32,238,000 |  | 21,191,000 |
Inter-segment Eliminations [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Sales revenues |  |  |  | $ 0 |  |  |
Type of Revenue [Extensible List] |  |  |  | us-gaap:ProductMember |  |  |
Inter-segment Eliminations [Member] | Mobile Modular [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Sales revenues |  |  |  |  |  | $ 1,360,000 |
Type of Revenue [Extensible List] |  |  |  |  |  | us-gaap:ProductMember |
[1] | Gross Enviroplex sales revenues were $32,238 and $21,191 for the nine months ended September 30, 2019 and 2018, respectively. There were $1,360 inter-segment sales to Mobile Modular in the nine months ended September 30, 2018, which required elimination in consolidation. There were no inter-segment sales in the nine months ended September 30, 2019.

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