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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  | $ 127,439,000 | $ 116,983,000 | $ 249,447,000 |  | $ 222,068,000 |
Sales revenues |  |  |  | (32,724,000) |  | (33,623,000) |
Sales [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Sales revenues |  | (13,707,000) | (19,546,000) | (30,532,000) |  | (31,637,000) |
Enviroplex [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  | 1,072,000 | 3,711,000 | 3,877,000 | [1] | 5,729,000 | [1]
Sales revenues | [1] |  |  | (3,877,000) |  | (5,729,000) |
Mobile Modular [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  | $ 67,722,000 | $ 59,871,000 | 132,814,000 |  | 113,722,000 |
Sales revenues |  |  |  | (15,444,000) |  | (14,169,000) |
Operating Segments [Member] | Enviroplex [Member] | Sales [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  | 3,877,000 |  | 6,524,000 |
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 |  |  |  |  |  | $ 795,000 |
Type of Revenue [Extensible List] |  |  |  |  |  | us-gaap:ProductMember |
[1] | Gross Enviroplex sales revenues were $3,877 and $6,524 for the six months ended June 30, 2019 and 2018, respectively. There were $795 inter-segment sales to Mobile Modular in the six months ended June 30, 2018, which required elimination in consolidation. There were no inter-segment sales in the six months ended June 30, 2019.

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