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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 133,115,000 | $ 143,147,000 | $ 116,983,000 | $ 105,085,000 | $ 122,227,000 | $ 135,388,000 | $ 109,582,000 | $ 94,837,000 | $ 498,330,000 | $ 462,034,000 | $ 424,080,000
Sales revenues |  |  |  |  |  |  |  |  |  | (96,649,000) | (94,549,000) | (76,833,000)
Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales revenues |  |  |  |  |  |  |  |  |  | (92,618,000) | (91,500,000) | (74,410,000)
Enviroplex [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [1] |  |  |  |  |  |  |  |  | 29,046,000 | 31,369,000 | 22,121,000
Sales revenues | [1] |  |  |  |  |  |  |  |  | (29,046,000) | (31,369,000) | (22,121,000)
Mobile Modular [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 254,574,000 | 231,266,000 | 209,512,000
Sales revenues |  |  |  |  |  |  |  |  |  | (40,742,000) | (38,234,000) | (29,810,000)
Operating Segments [Member] | Enviroplex [Member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 30,407,000 | 31,369,000 | 22,206,000
Inter-segment Eliminations [Member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales revenues |  |  |  |  |  |  |  |  |  |  | $ 0 |
Inter-segment Eliminations [Member] | Mobile Modular [Member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales revenues |  |  |  |  |  |  |  |  |  | $ 1,361,000 |  | $ 85,000
[1] | Gross Enviroplex sales revenues were $30,407, $31,369 and $22,206 in 2018, 2017 and 2016, respectively. There were $1,361 and $85 inter-segment sales to Mobile Modular in 2018 and 2016, respectively, which have been eliminated in consolidation. There were no inter-segment sales in 2017.

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