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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  | $ 92,231 | $ 90,857 | $ 88,105 | $ 82,696 | $ 85,091 | $ 82,155 | $ 77,267 | $ 74,261 | $ 353,889 | $ 318,774 | $ 289,417
Rental related services revenues |  |  |  |  |  |  |  |  |  | 101,038 | 82,907 | 78,068
Sales and other revenues |  |  |  |  |  |  |  |  |  | 115,303 | 96,649 | 94,549
Total revenues |  | 147,221 | 173,562 | 127,439 | 122,008 | 133,115 | 143,147 | 116,983 | 105,085 | 570,230 | 498,330 | 462,034
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 80,391 | 73,139 | 69,908
Gross profit |  | 70,997 | 78,282 | 59,881 | 57,005 | 65,103 | 64,050 | 53,928 | 50,170 | 266,165 | 233,251 | 206,345
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 124,793 | 115,770 | 111,605
Income from operations |  | 38,248 | 46,748 | 29,066 | 27,310 | 35,166 | 35,824 | 24,449 | 22,042 | 141,372 | 117,481 | 94,740
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | 12,331 | (12,297) | (11,622)
Income before provision for income taxes |  | 35,454 | 43,455 | 25,965 | 24,251 | 32,018 | 32,553 | 21,106 | 19,018 | 129,125 | 104,695 | 83,452
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 170,018 | 134,098 | 98,107
Accounts receivable, net (period end) |  | 128,099 |  |  |  | 121,016 |  |  |  | 128,099 | 121,016 | 105,872
Rental equipment, at cost (period end) |  | 1,520,411 |  |  |  | 1,416,000 |  |  |  | 1,520,411 | 1,416,000 | 1,347,533
Rental equipment, net book value (period end) |  | 967,500 | $ 958,610 | $ 943,152 | $ 912,878 | 901,015 | $ 888,607 | $ 876,522 | $ 865,338 | 967,500 | 901,015 | 862,320
Mobile Modular [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | 182,316 | 159,136 | 142,584
Rental related services revenues |  |  |  |  |  |  |  |  |  | 69,395 | 54,696 | 50,448
Sales and other revenues |  |  |  |  |  |  |  |  |  | 49,299 | 40,742 | 38,234
Total revenues |  |  |  |  |  |  |  |  |  | 301,010 | 254,574 | 231,266
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 22,071 | 21,200 | 21,247
Gross profit |  |  |  |  |  |  |  |  |  | 143,618 | 120,750 | 103,935
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 65,699 | 58,017 | 55,583
Income from operations |  |  |  |  |  |  |  |  |  | 77,919 | 62,733 | 48,352
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | 7,946 | (7,132) | (6,671)
Income before provision for income taxes |  |  |  |  |  |  |  |  |  | 69,973 | 55,601 | 41,681
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 75,433 | 63,374 | 34,526
Accounts receivable, net (period end) |  | 83,182 |  |  |  | 72,295 |  |  |  | 83,182 | 72,295 | 59,274
Rental equipment, at cost (period end) |  | 868,807 |  |  |  | 817,375 |  |  |  | 868,807 | 817,375 | 775,400
Rental equipment, net book value (period end) |  | 610,048 |  |  |  | 572,032 |  |  |  | $ 610,048 | $ 572,032 | $ 543,857
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 79.10% | 79.30% | 77.80%
Average utilization | [1] |  |  |  |  |  |  |  |  | 79.20% | 78.20% | 76.80%
TRS-RenTelco [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | $ 103,704 | $ 89,937 | $ 82,812
Rental related services revenues |  |  |  |  |  |  |  |  |  | 3,260 | 3,300 | 2,858
Sales and other revenues |  |  |  |  |  |  |  |  |  | 24,519 | 25,420 | 22,374
Total revenues |  |  |  |  |  |  |  |  |  | 131,483 | 118,657 | 108,044
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 41,948 | 36,011 | 32,891
Gross profit |  |  |  |  |  |  |  |  |  | 60,748 | 54,773 | 50,289
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 24,645 | 22,823 | 22,171
Income from operations |  |  |  |  |  |  |  |  |  | 36,103 | 31,950 | 28,118
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | 1,970 | (2,696) | (2,320)
Income before provision for income taxes |  |  |  |  |  |  |  |  |  | 34,217 | 28,765 | 26,132
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 89,759 | 65,467 | 58,781
Accounts receivable, net (period end) |  | 23,788 |  |  |  | 20,732 |  |  |  | 23,788 | 20,732 | 19,581
Rental equipment, at cost (period end) |  | 335,343 |  |  |  | 285,052 |  |  |  | 335,343 | 285,052 | 262,325
Rental equipment, net book value (period end) |  | 172,413 |  |  |  | 131,450 |  |  |  | $ 172,413 | $ 131,450 | $ 109,482
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 64.50% | 62.10% | 61.70%
Average utilization | [1] |  |  |  |  |  |  |  |  | 66.20% | 62.70% | 62.90%
Adler Tanks [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | $ 67,869 | $ 69,701 | $ 64,021
Rental related services revenues |  |  |  |  |  |  |  |  |  | 28,383 | 24,911 | 24,762
Sales and other revenues |  |  |  |  |  |  |  |  |  | 1,671 | 1,441 | 2,572
Total revenues |  |  |  |  |  |  |  |  |  | 97,923 | 96,053 | 91,355
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 16,372 | 15,928 | 15,770
Gross profit |  |  |  |  |  |  |  |  |  | 47,014 | 48,055 | 43,218
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 29,321 | 30,026 | 29,542
Income from operations |  |  |  |  |  |  |  |  |  | 17,693 | 18,029 | 13,676
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | 3,436 | (3,252) | (3,071)
Income before provision for income taxes |  |  |  |  |  |  |  |  |  | 14,257 | 14,777 | 10,605
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 4,826 | 5,257 | 4,800
Accounts receivable, net (period end) |  | 17,281 |  |  |  | 19,992 |  |  |  | 17,281 | 19,992 | 18,663
Rental equipment, at cost (period end) |  | 316,261 |  |  |  | 313,573 |  |  |  | 316,261 | 313,573 | 309,808
Rental equipment, net book value (period end) |  | 185,039 |  |  |  | 197,533 |  |  |  | $ 185,039 | $ 197,533 | $ 208,981
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 48.40% | 56.40% | 57.50%
Average utilization | [1] |  |  |  |  |  |  |  |  | 54.70% | 59.90% | 56.00%
Enviroplex [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales and other revenues | [2] |  |  |  |  |  |  |  |  | $ 39,814 | $ 29,046 | $ 31,369
Total revenues | [2] |  |  |  |  |  |  |  |  | 39,814 | 29,046 | 31,369
Gross profit | [2] |  |  |  |  |  |  |  |  | 14,785 | 9,673 | 8,903
Selling and administrative expenses | [2] |  |  |  |  |  |  |  |  | 5,128 | 4,904 | 4,309
Income from operations | [2] |  |  |  |  |  |  |  |  | 9,657 | 4,769 | 4,594
Interest expense (income) allocation | [2] |  |  |  |  |  |  |  |  | (1,021) | 783 | 440
Income before provision for income taxes | [2] |  |  |  |  |  |  |  |  | 10,678 | 5,552 | 5,034
Accounts receivable, net (period end) | [2] | $ 3,848 |  |  |  | $ 7,997 |  |  |  | $ 3,848 | $ 7,997 | $ 8,354
[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 $39,814, $30,407 and $31,369 in 2019, 2018 and 2017, respectively. There were $1,361 inter-segment sales to Mobile Modular in 2018, which have been eliminated in consolidation. There were no inter-segment sales in 2019 and 2017.

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