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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Rental revenues |  | $ 90,857 | $ 82,155 | $ 261,658 |  | $ 233,683 |  |
Rental related services revenues |  | 30,816 | 23,880 | 76,738 |  | 60,797 |  |
Sales and other revenues |  |  |  | 84,613 |  | 70,735 |  |
Total revenues |  | 173,562 | 143,147 | 423,009 |  | 365,215 |  |
Depreciation of rental equipment |  | 20,535 | 18,407 | 59,222 |  | 54,287 |  |
Gross profit |  | 78,282 | 64,050 | 195,168 |  | 168,148 |  |
Selling and administrative expenses |  | 31,534 | 28,226 | 92,044 |  | 85,833 |  |
Income from operations |  | 46,748 | 35,824 | 103,124 |  | 82,315 |  |
Interest (expense) income allocation |  |  |  | (9,407) |  | (9,133) |  |
Income before provision for income taxes |  | 43,455 | 32,553 | 93,671 |  | 72,677 |  |
Rental equipment acquisitions |  |  |  | 132,493 |  | 95,635 |  |
Accounts receivable, net (period end) |  | 138,114 | 115,089 | 138,114 |  | 115,089 |  | $ 121,016
Rental equipment, at cost (period end) |  | 1,502,769 | 1,398,263 | 1,502,769 |  | 1,398,263 |  | 1,416,000
Rental equipment, net book value (period end) |  | 958,610 | 888,607 | 958,610 |  | 888,607 |  | $ 901,015
Mobile Modular [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Rental revenues |  |  |  | 133,736 |  | 116,436 |  |
Rental related services revenues |  |  |  | 52,946 |  | 40,510 |  |
Sales and other revenues |  |  |  | 32,434 |  | 31,667 |  |
Total revenues |  | 86,302 | 74,891 | 219,116 |  | 188,613 |  |
Depreciation of rental equipment |  |  |  | 16,449 |  | 15,841 |  |
Gross profit |  |  |  | 102,029 |  | 86,515 |  |
Selling and administrative expenses |  |  |  | 48,013 |  | 43,191 |  |
Income from operations |  |  |  | 54,016 |  | 43,324 |  |
Interest (expense) income allocation |  |  |  | (5,948) |  | (5,256) |  |
Income before provision for income taxes |  |  |  | 48,068 |  | 38,068 |  |
Rental equipment acquisitions |  |  |  | 62,084 |  | 40,704 |  |
Accounts receivable, net (period end) |  | 88,893 | 69,419 | 88,893 |  | 69,419 |  |
Rental equipment, at cost (period end) |  | 865,254 | 801,129 | 865,254 |  | 801,129 |  |
Rental equipment, net book value (period end) |  | 607,949 | 558,790 | $ 607,949 |  | $ 558,790 |  |
Utilization (period end) | [1] |  |  | 79.50% |  | 79.20% |  |
Average utilization | [1] |  |  | 79.10% |  | 77.80% |  |
TRS-RenTelco [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Rental revenues |  |  |  | $ 76,050 |  | $ 65,919 |  |
Rental related services revenues |  |  |  | 2,425 |  | 2,287 |  |
Sales and other revenues |  |  |  | 18,601 |  | 18,321 |  |
Total revenues |  | 34,090 | 28,137 | 97,076 |  | 86,527 |  |
Depreciation of rental equipment |  |  |  | 30,533 |  | 26,536 |  |
Gross profit |  |  |  | 44,673 |  | 40,155 |  |
Selling and administrative expenses |  |  |  | 18,101 |  | 16,780 |  |
Income from operations |  |  |  | 26,572 |  | 23,375 |  |
Interest (expense) income allocation |  |  |  | (1,662) |  | (1,999) |  |
Income before provision for income taxes |  |  |  | 24,864 |  | 20,871 |  |
Rental equipment acquisitions |  |  |  | 66,525 |  | 51,744 |  |
Accounts receivable, net (period end) |  | 22,515 | 18,991 | 22,515 |  | 18,991 |  |
Rental equipment, at cost (period end) |  | 321,677 | 284,647 | 321,677 |  | 284,647 |  |
Rental equipment, net book value (period end) |  | 162,196 | 129,816 | $ 162,196 |  | $ 129,816 |  |
Utilization (period end) | [1] |  |  | 67.10% |  | 61.50% |  |
Average utilization | [1] |  |  | 66.00% |  | 62.40% |  |
Adler Tanks [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Rental revenues |  |  |  | $ 51,872 |  | $ 51,328 |  |
Rental related services revenues |  |  |  | 21,367 |  | 18,000 |  |
Sales and other revenues |  |  |  | 1,340 |  | 916 |  |
Total revenues |  | 24,809 | 26,017 | 74,579 |  | 70,244 |  |
Depreciation of rental equipment |  |  |  | 12,240 |  | 11,910 |  |
Gross profit |  |  |  | 36,380 |  | 35,031 |  |
Selling and administrative expenses |  |  |  | 22,054 |  | 22,245 |  |
Income from operations |  |  |  | 14,326 |  | 12,786 |  |
Interest (expense) income allocation |  |  |  | (2,598) |  | (2,409) |  |
Income before provision for income taxes |  |  |  | 11,728 |  | 10,377 |  |
Rental equipment acquisitions |  |  |  | 3,884 |  | 3,187 |  |
Accounts receivable, net (period end) |  | 19,382 | 19,876 | 19,382 |  | 19,876 |  |
Rental equipment, at cost (period end) |  | 315,838 | 312,487 | 315,838 |  | 312,487 |  |
Rental equipment, net book value (period end) |  | 188,465 | 200,001 | $ 188,465 |  | $ 200,001 |  |
Utilization (period end) | [1] |  |  | 51.00% |  | 64.00% |  |
Average utilization | [1] |  |  | 56.20% |  | 59.80% |  |
Enviroplex [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Sales and other revenues | [2] |  |  | $ 32,238 |  | $ 19,831 |  |
Total revenues |  | 28,361 | 14,102 | 32,238 | [2] | 19,831 | [2] |
Gross profit | [2] |  |  | 12,086 |  | 6,447 |  |
Selling and administrative expenses | [2] |  |  | 3,876 |  | 3,617 |  |
Income from operations | [2] |  |  | 8,210 |  | 2,830 |  |
Interest (expense) income allocation | [2] |  |  | 801 |  | 531 |  |
Income before provision for income taxes | [2] |  |  | 9,011 |  | 3,361 |  |
Accounts receivable, net (period end) | [2] | $ 7,324 | $ 6,803 | $ 7,324 |  | $ 6,803 |  |
[1] | Utilization is calculated each month by dividing the cost of rental equipment on rent by the total cost of rental equipment excluding accessory equipment and for Mobile Modular and Adler Tanks excluding new equipment inventory. The Average utilization for the period is calculated using the average costs of rental equipment.
[2] | Gross Enviroplex sales revenues were $32,238 and $21,191 for the nine months ended September 30, 2019 and 2018, respectively. There were $1,360 inter-segment sales to Mobile Modular in the nine months ended September 30, 2018, which required elimination in consolidation. There were no inter-segment sales in the nine months ended September 30, 2019.

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