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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |
Rental revenues |  | $ 456,029 | $ 390,013 | $ 351,790
Rental related services revenues |  | 122,617 | 98,061 | 92,393
Revenue from Contract with Customer, Excluding Assessed Tax |  | 155,177 | 128,759 | 128,371
Total revenues |  | 733,823 | 616,833 | 572,554
Depreciation of rental equipment |  | 96,429 | 91,887 | 85,866
Gross profit |  | 336,908 | 281,021 | 263,746
Selling and administrative expenses |  | 171,342 | 148,600 | 122,993
Income from operations |  | 165,566 | 132,421 | 140,753
Interest expense (income) allocation |  | 15,168 | 10,455 | 8,787
Income before provision/benefit for income taxes |  | 150,020 | 121,756 | 132,044
Adjusted EBITDA | [1] | 288,866 | 248,617 | 241,023
Rental equipment acquisitions |  | 195,158 | 249,680 | 84,207
Accounts receivable, net (period end) |  | 190,023 | 159,499 | 123,316
Rental equipment, at cost (period end) |  | 1,829,931 | 1,711,393 | 1,530,841
Rental equipment, net book value (period end) |  | 1,128,054 | 1,065,224 | 938,116
Mobile Modular [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental revenues |  | 268,288 | 220,569 | 188,719
Rental related services revenues |  | 91,851 | 72,330 | 67,527
Revenue from Contract with Customer, Excluding Assessed Tax |  | 101,578 | 70,417 | 65,278
Total revenues |  | 461,717 | 363,316 | 321,524
Depreciation of rental equipment |  | 31,172 | 28,071 | 22,967
Gross profit |  | 217,187 | 176,040 | 155,874
Selling and administrative expenses |  | 110,234 | 92,603 | 68,470
Income from operations |  | 106,953 | 83,436 | 87,404
Interest expense (income) allocation |  | 10,175 | 6,433 | 5,104
Income before provision/benefit for income taxes |  | 96,778 | 77,003 | 82,300
Adjusted EBITDA | [1] | 159,224 | 130,089 | 119,202
Rental equipment acquisitions |  | 121,607 | 188,392 | 39,078
Accounts receivable, net (period end) |  | 139,107 | 112,295 | 81,640
Rental equipment, at cost (period end) |  | 1,123,268 | 1,040,094 | 882,115
Rental equipment, net book value (period end) |  | $ 815,392 | $ 751,537 | $ 611,590
Utilization (period end) | [2] | 80.70% | 76.40% | 76.00%
Average utilization | [2] | 79.10% | 76.20% | 77.20%
TRS-RenTelco [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental revenues |  | $ 121,375 | $ 113,419 | $ 109,083
Rental related services revenues |  | 3,112 | 2,880 | 3,080
Revenue from Contract with Customer, Excluding Assessed Tax |  | 26,291 | 23,895 | 28,648
Total revenues |  | 150,778 | 140,194 | 140,811
Depreciation of rental equipment |  | 49,253 | 47,374 | 46,472
Gross profit |  | 67,899 | 61,394 | 60,864
Selling and administrative expenses |  | 27,245 | 25,152 | 24,306
Income from operations |  | 40,654 | 36,243 | 36,558
Interest expense (income) allocation |  | 3,294 | 2,270 | 2,133
Income before provision/benefit for income taxes |  | 36,982 | 33,763 | 34,503
Adjusted EBITDA | [1] | 92,007 | 85,723 | 85,082
Rental equipment acquisitions |  | 69,928 | 61,097 | 42,588
Accounts receivable, net (period end) |  | 26,442 | 22,115 | 22,735
Rental equipment, at cost (period end) |  | 398,267 | 361,391 | 333,020
Rental equipment, net book value (period end) |  | $ 174,924 | $ 161,900 | $ 156,536
Utilization (period end) | [2] | 59.40% | 62.90% | 67.40%
Average utilization | [2] | 64.20% | 67.00% | 66.20%
Adler Tanks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental revenues |  | $ 66,366 | $ 56,025 | $ 53,988
Rental related services revenues |  | 27,654 | 22,851 | 21,786
Revenue from Contract with Customer, Excluding Assessed Tax |  | 4,138 | 3,366 | 1,708
Total revenues |  | 98,158 | 82,242 | 77,482
Depreciation of rental equipment |  | 16,004 | 16,442 | 16,427
Gross profit |  | 46,700 | 33,699 | 34,079
Selling and administrative expenses |  | 28,428 | 25,542 | 24,764
Income from operations |  | 18,272 | 8,157 | 9,315
Interest expense (income) allocation |  | 2,938 | 2,211 | 2,107
Income before provision/benefit for income taxes |  | 15,334 | 5,946 | 7,208
Adjusted EBITDA | [1] | 37,660 | 27,961 | 29,010
Rental equipment acquisitions |  | 3,623 | 191 | 2,541
Accounts receivable, net (period end) |  | 20,172 | 16,378 | 13,655
Rental equipment, at cost (period end) |  | 308,396 | 309,908 | 315,706
Rental equipment, net book value (period end) |  | $ 137,738 | $ 151,787 | $ 169,990
Utilization (period end) | [2] | 57.10% | 47.60% | 39.80%
Average utilization | [2] | 53.10% | 45.40% | 44.60%
Enviroplex [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [3] | $ 23,170 | $ 31,081 | $ 32,737
Total revenues | [3] | 23,170 | 31,081 | 32,737
Gross profit | [3] | 5,122 | 9,888 | 12,929
Selling and administrative expenses | [3] | 5,435 | 5,303 | 5,453
Income from operations | [3] | (313) | 4,585 | 7,476
Interest expense (income) allocation | [3] | (1,239) | (459) | (557)
Income before provision/benefit for income taxes | [3] | 926 | 5,044 | 8,033
Adjusted EBITDA | [1],[3] | (25) | 4,844 | 7,729
Accounts receivable, net (period end) | [3] | $ 4,302 | $ 8,711 | $ 5,286
[1] | During the year ended December 31, 2022, the calculation for Adjusted EBITDA was adjusted to include one-time transaction costs attributed to acquisition, divestiture and integration related activities. For comparability, the transaction costs incurred during 2021 were included in the Adjusted EBITDA calculation for the year ended December 31, 2021. During the years ended December 31, 2022 and 2021, there were $4.3 million and $2.0 million of transaction costs, respectively, included in the Adjusted EBITDA calculation. There were no transaction costs included in the calculation for the year ended December 31, 2020. Additional information on Adjusted EBITDA can be found on page 46.
[2] | Utilization is calculated each month by dividing the cost of rental equipment on rent by the total cost of rental equipment excluding new equipment inventory and accessory equipment. The average utilization for the period is calculated using the average costs of rental equipment.
[3] | Gross Enviroplex sales revenues were $24,162, $32,095 and $34,014 in 2022, 2021 and 2020, respectively. There were $992 and $1,014 inter-segment sales to Mobile Modular in 2022 and 2021, which have been eliminated in consolidation. There were no inter-segment sales in 2019.

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