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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  | $ 88,517 | $ 88,138 | $ 85,629 | $ 89,506 | $ 92,231 | $ 90,857 | $ 88,105 | $ 82,696 | $ 351,790 | $ 353,889 | $ 318,774
Rental related services revenues |  |  |  |  |  |  |  |  |  | 92,393 | 101,038 | 82,907
Sales and other revenues |  |  |  |  |  |  |  |  |  | 128,371 | 115,303 | 96,649
Total revenues |  | 148,980 | 156,448 | 137,673 | 129,453 | 147,221 | 173,562 | 127,439 | 122,008 | 572,554 | 570,230 | 498,330
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 85,866 | 80,391 | 73,139
Gross profit |  | 70,654 | 68,204 | 63,232 | 61,656 | 70,997 | 78,282 | 59,881 | 57,005 | 263,746 | 266,165 | 233,251
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 122,993 | 124,793 | 115,770
Income from operations |  | 41,026 | 37,333 | 32,692 | 29,702 | 38,248 | 46,748 | 29,066 | 27,310 | 140,753 | 141,372 | 117,481
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | 8,787 | 12,331 | 12,297
Income before provision/benefit for income taxes |  | 39,310 | 35,495 | 30,625 | 26,614 | 35,454 | 43,455 | 25,965 | 24,251 | 132,044 | 129,125 | 104,695
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 84,207 | 170,018 | 134,098
Accounts receivable, net (period end) |  | 123,316 |  |  |  | 128,099 |  |  |  | 123,316 | 128,099 | 121,016
Rental equipment, at cost (period end) |  | 1,530,841 |  |  |  | 1,520,411 |  |  |  | 1,530,841 | 1,520,411 | 1,416,000
Rental equipment, net book value (period end) |  | 938,116 | $ 948,125 | $ 969,681 | $ 975,709 | 967,500 | $ 958,610 | $ 943,152 | $ 912,878 | 938,116 | 967,500 | 901,015
Mobile Modular [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | 188,719 | 182,316 | 159,136
Rental related services revenues |  |  |  |  |  |  |  |  |  | 67,527 | 69,395 | 54,696
Sales and other revenues |  |  |  |  |  |  |  |  |  | 65,278 | 49,299 | 40,742
Total revenues |  |  |  |  |  |  |  |  |  | 321,524 | 301,010 | 254,574
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 22,967 | 22,071 | 21,200
Gross profit |  |  |  |  |  |  |  |  |  | 155,874 | 143,618 | 120,750
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 68,470 | 65,699 | 58,017
Income from operations |  |  |  |  |  |  |  |  |  | 87,404 | 77,919 | 62,733
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | 5,104 | 7,946 | 7,132
Income before provision/benefit for income taxes |  |  |  |  |  |  |  |  |  | 82,300 | 69,973 | 55,601
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 39,078 | 75,433 | 63,374
Accounts receivable, net (period end) |  | 81,640 |  |  |  | 83,182 |  |  |  | 81,640 | 83,182 | 72,295
Rental equipment, at cost (period end) |  | 882,115 |  |  |  | 868,807 |  |  |  | 882,115 | 868,807 | 817,375
Rental equipment, net book value (period end) |  | 611,590 |  |  |  | 610,048 |  |  |  | $ 611,590 | $ 610,048 | $ 572,032
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 76.00% | 79.10% | 79.30%
Average utilization | [1] |  |  |  |  |  |  |  |  | 77.20% | 79.20% | 78.20%
TRS-RenTelco [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | $ 109,083 | $ 103,704 | $ 89,937
Rental related services revenues |  |  |  |  |  |  |  |  |  | 3,080 | 3,260 | 3,300
Sales and other revenues |  |  |  |  |  |  |  |  |  | 28,648 | 24,519 | 25,420
Total revenues |  |  |  |  |  |  |  |  |  | 140,811 | 131,483 | 118,657
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 46,472 | 41,948 | 36,011
Gross profit |  |  |  |  |  |  |  |  |  | 60,864 | 60,748 | 54,773
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 24,306 | 24,645 | 22,823
Income from operations |  |  |  |  |  |  |  |  |  | 36,558 | 36,103 | 31,950
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | 2,133 | 1,970 | 2,696
Income before provision/benefit for income taxes |  |  |  |  |  |  |  |  |  | 34,503 | 34,217 | 28,765
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 42,588 | 89,759 | 65,467
Accounts receivable, net (period end) |  | 22,735 |  |  |  | 23,788 |  |  |  | 22,735 | 23,788 | 20,732
Rental equipment, at cost (period end) |  | 333,020 |  |  |  | 335,343 |  |  |  | 333,020 | 335,343 | 285,052
Rental equipment, net book value (period end) |  | 156,536 |  |  |  | 172,413 |  |  |  | $ 156,536 | $ 172,413 | $ 131,450
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 67.40% | 64.50% | 62.10%
Average utilization | [1] |  |  |  |  |  |  |  |  | 66.20% | 66.20% | 62.70%
Adler Tanks [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | $ 53,988 | $ 67,869 | $ 69,701
Rental related services revenues |  |  |  |  |  |  |  |  |  | 21,786 | 28,383 | 24,911
Sales and other revenues |  |  |  |  |  |  |  |  |  | 1,708 | 1,671 | 1,441
Total revenues |  |  |  |  |  |  |  |  |  | 77,482 | 97,923 | 96,053
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 16,427 | 16,372 | 15,928
Gross profit |  |  |  |  |  |  |  |  |  | 34,079 | 47,014 | 48,055
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 24,764 | 29,321 | 30,026
Income from operations |  |  |  |  |  |  |  |  |  | 9,315 | 17,693 | 18,029
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | 2,107 | 3,436 | 3,252
Income before provision/benefit for income taxes |  |  |  |  |  |  |  |  |  | 7,208 | 14,257 | 14,777
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 2,541 | 4,826 | 5,257
Accounts receivable, net (period end) |  | 13,655 |  |  |  | 17,281 |  |  |  | 13,655 | 17,281 | 19,992
Rental equipment, at cost (period end) |  | 315,706 |  |  |  | 316,261 |  |  |  | 315,706 | 316,261 | 313,573
Rental equipment, net book value (period end) |  | 169,990 |  |  |  | 185,039 |  |  |  | $ 169,990 | $ 185,039 | $ 197,533
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 39.80% | 48.40% | 56.40%
Average utilization | [1] |  |  |  |  |  |  |  |  | 44.60% | 54.70% | 59.90%
Enviroplex [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales and other revenues | [2] |  |  |  |  |  |  |  |  | $ 32,737 | $ 39,814 | $ 29,046
Total revenues | [2] |  |  |  |  |  |  |  |  | 32,737 | 39,814 | 29,046
Gross profit | [2] |  |  |  |  |  |  |  |  | 12,929 | 14,785 | 9,673
Selling and administrative expenses | [2] |  |  |  |  |  |  |  |  | 5,453 | 5,128 | 4,904
Income from operations | [2] |  |  |  |  |  |  |  |  | 7,476 | 9,657 | 4,769
Interest expense (income) allocation | [2] |  |  |  |  |  |  |  |  | (557) | (1,021) | (783)
Income before provision/benefit for income taxes | [2] |  |  |  |  |  |  |  |  | 8,033 | 10,678 | 5,552
Accounts receivable, net (period end) | [2] | $ 5,286 |  |  |  | $ 3,848 |  |  |  | $ 5,286 | $ 3,848 | $ 7,997
[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 $34,014, $39,814 and $30,407 in 2020, 2019 and 2018, respectively. There were $1,277 and $1,361 inter-segment sales to Mobile Modular in 2020 and 2018, which have been eliminated in consolidation. There were no inter-segment sales in 2019.

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