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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |
Rental revenues |  | $ 390,013 | $ 351,790 | $ 353,889
Rental related services revenues |  | 98,061 | 92,393 | 101,038
Sales and other revenues |  | 128,759 | 128,371 | 115,303
Total revenues |  | 616,833 | 572,554 | 570,230
Depreciation of rental equipment |  | 91,887 | 85,866 | 80,391
Gross profit |  | 281,021 | 263,746 | 266,165
Selling and administrative expenses |  | 148,600 | 122,993 | 124,793
Income from operations |  | 132,421 | 140,753 | 141,372
Interest expense (income) allocation |  | 10,455 | 8,787 | 12,331
Income before provision/benefit for income taxes |  | 121,756 | 132,044 | 129,125
Adjusted EBITDA |  | 246,572 | 241,023 | 236,823
Rental equipment acquisitions |  | 249,680 | 84,207 | 170,018
Accounts receivable, net (period end) |  | 159,499 | 123,316 | 128,099
Rental equipment, at cost (period end) |  | 1,711,393 | 1,530,841 | 1,520,411
Rental equipment, net book value (period end) |  | 1,065,224 | 938,116 | 967,500
Mobile Modular [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental revenues |  | 220,569 | 188,719 | 182,316
Rental related services revenues |  | 72,330 | 67,527 | 69,395
Sales and other revenues |  | 70,417 | 65,278 | 49,299
Total revenues |  | 363,316 | 321,524 | 301,010
Depreciation of rental equipment |  | 28,071 | 22,967 | 22,071
Gross profit |  | 176,040 | 155,874 | 143,618
Selling and administrative expenses |  | 92,603 | 68,470 | 65,699
Income from operations |  | 83,436 | 87,404 | 77,919
Interest expense (income) allocation |  | 6,433 | 5,104 | 7,946
Income before provision/benefit for income taxes |  | 77,003 | 82,300 | 69,973
Adjusted EBITDA |  | 128,044 | 119,202 | 107,166
Rental equipment acquisitions |  | 188,392 | 39,078 | 75,433
Accounts receivable, net (period end) |  | 112,295 | 81,640 | 83,182
Rental equipment, at cost (period end) |  | 1,040,094 | 882,115 | 868,807
Rental equipment, net book value (period end) |  | $ 751,537 | $ 611,590 | $ 610,048
Utilization (period end) | [1] | 76.40% | 76.00% | 79.10%
Average utilization | [1] | 76.20% | 77.20% | 79.20%
TRS-RenTelco [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental revenues |  | $ 113,419 | $ 109,083 | $ 103,704
Rental related services revenues |  | 2,880 | 3,080 | 3,260
Sales and other revenues |  | 23,895 | 28,648 | 24,519
Total revenues |  | 140,194 | 140,811 | 131,483
Depreciation of rental equipment |  | 47,374 | 46,472 | 41,948
Gross profit |  | 61,394 | 60,864 | 60,748
Selling and administrative expenses |  | 25,152 | 24,306 | 24,645
Income from operations |  | 36,243 | 36,558 | 36,103
Interest expense (income) allocation |  | 2,270 | 2,133 | 1,970
Income before provision/benefit for income taxes |  | 33,763 | 34,503 | 34,217
Adjusted EBITDA |  | 85,723 | 85,082 | 80,772
Rental equipment acquisitions |  | 61,097 | 42,588 | 89,759
Accounts receivable, net (period end) |  | 22,115 | 22,735 | 23,788
Rental equipment, at cost (period end) |  | 361,391 | 333,020 | 335,343
Rental equipment, net book value (period end) |  | $ 161,900 | $ 156,536 | $ 172,413
Utilization (period end) | [1] | 62.90% | 67.40% | 64.50%
Average utilization | [1] | 67.00% | 66.20% | 66.20%
Adler Tanks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental revenues |  | $ 56,025 | $ 53,988 | $ 67,869
Rental related services revenues |  | 22,851 | 21,786 | 28,383
Sales and other revenues |  | 3,366 | 1,708 | 1,671
Total revenues |  | 82,242 | 77,482 | 97,923
Depreciation of rental equipment |  | 16,442 | 16,427 | 16,372
Gross profit |  | 33,699 | 34,079 | 47,014
Selling and administrative expenses |  | 25,542 | 24,764 | 29,321
Income from operations |  | 8,157 | 9,315 | 17,693
Interest expense (income) allocation |  | 2,211 | 2,107 | 3,436
Income before provision/benefit for income taxes |  | 5,946 | 7,208 | 14,257
Adjusted EBITDA |  | 27,961 | 29,010 | 38,993
Rental equipment acquisitions |  | 191 | 2,541 | 4,826
Accounts receivable, net (period end) |  | 16,378 | 13,655 | 17,281
Rental equipment, at cost (period end) |  | 309,908 | 315,706 | 316,261
Rental equipment, net book value (period end) |  | $ 151,787 | $ 169,990 | $ 185,039
Utilization (period end) | [1] | 47.60% | 39.80% | 48.40%
Average utilization | [1] | 45.40% | 44.60% | 54.70%
Enviroplex [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other revenues | [2] | $ 31,081 | $ 32,737 | $ 39,814
Total revenues | [2] | 31,081 | 32,737 | 39,814
Gross profit | [2] | 9,888 | 12,929 | 14,785
Selling and administrative expenses | [2] | 5,303 | 5,453 | 5,128
Income from operations | [2] | 4,585 | 7,476 | 9,657
Interest expense (income) allocation | [2] | (459) | (557) | (1,021)
Income before provision/benefit for income taxes | [2] | 5,044 | 8,033 | 10,678
Adjusted EBITDA | [2] | 4,844 | 7,729 | 9,892
Accounts receivable, net (period end) | [2] | $ 8,711 | $ 5,286 | $ 3,848
[1] | 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.
[2] | Gross Enviroplex sales revenues were $32,095, $34,014 and $39,814 in 2021, 2020 and 2019, respectively. There were $1,014 and $1,277 inter-segment sales to Mobile Modular in 2021 and 2020, which have been eliminated in consolidation. There were no inter-segment sales in 2019.

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