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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  | $ 77,705 | $ 73,781 | $ 69,953 | $ 67,978 | $ 70,352 | $ 67,757 | $ 66,747 | $ 66,532 | $ 289,417 | $ 271,388 | $ 273,696
Rental related services revenues |  |  |  |  |  |  |  |  |  | 78,068 | 75,859 | 73,314
Sales and other revenues |  |  |  |  |  |  |  |  |  | 94,549 | 76,833 | 57,534
Total revenues |  | 122,227 | 135,388 | 109,582 | 94,837 | 105,283 | 121,993 | 103,105 | 93,699 | 462,034 | 424,080 | 404,544
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 69,908 | 72,197 | 75,213
Gross profit |  | 54,689 | 58,775 | 49,211 | 43,670 | 49,323 | 50,433 | 43,756 | 40,655 | 206,345 | 184,167 | 176,907
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 111,605 | 104,908 | 99,950
Income from operations |  | 26,786 | 30,286 | 21,846 | 15,822 | 22,696 | 24,232 | 18,073 | 14,258 | 94,740 | 79,259 | 76,957
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | (11,622) | (12,207) | (10,092)
Income before (benefit) provision for income taxes |  | 23,949 | 27,336 | 18,908 | 13,259 | 19,795 | 21,277 | 15,006 | 10,853 | 83,452 | 66,931 | 66,377
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 98,107 | 74,634 | 133,378
Accounts receivable, net (period end) |  | 105,872 |  |  |  | 96,877 |  |  |  | 105,872 | 96,877 | 95,017
Rental equipment, at cost (period end) |  | 1,347,533 |  |  |  | 1,324,057 |  |  |  | 1,347,533 | 1,324,057 | 1,310,083
Rental equipment, net book value (period end) |  | 862,320 | $ 865,724 | $ 863,207 | $ 856,981 | 856,371 | $ 862,528 | $ 868,422 | $ 867,215 | 862,320 | 856,371 | 869,601
Mobile Modular [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | 142,584 | 130,496 | 115,986
Rental related services revenues |  |  |  |  |  |  |  |  |  | 50,448 | 49,206 | 45,616
Sales and other revenues |  |  |  |  |  |  |  |  |  | 38,234 | 29,810 | 22,682
Total revenues |  |  |  |  |  |  |  |  |  | 231,266 | 209,512 | 184,284
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 21,247 | 21,001 | 19,246
Gross profit |  |  |  |  |  |  |  |  |  | 103,935 | 93,816 | 78,771
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 55,583 | 51,432 | 46,496
Income from operations |  |  |  |  |  |  |  |  |  | 48,352 | 42,384 | 32,275
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | (6,671) | (6,804) | (5,363)
Income before (benefit) provision for income taxes |  |  |  |  |  |  |  |  |  | 41,681 | 35,580 | 26,912
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 34,526 | 43,099 | 79,622
Accounts receivable, net (period end) |  | 59,274 |  |  |  | 55,916 |  |  |  | 59,274 | 55,916 | 53,550
Rental equipment, at cost (period end) |  | 775,400 |  |  |  | 744,099 |  |  |  | 775,400 | 744,099 | 736,875
Rental equipment, net book value (period end) |  | 543,857 |  |  |  | 544,421 |  |  |  | $ 543,857 | $ 544,421 | $ 529,483
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 77.80% | 77.30% | 76.90%
Average utilization | [1] |  |  |  |  |  |  |  |  | 76.80% | 76.60% | 75.80%
TRS-RenTelco [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | $ 82,812 | $ 82,307 | $ 89,208
Rental related services revenues |  |  |  |  |  |  |  |  |  | 2,858 | 2,846 | 3,055
Sales and other revenues |  |  |  |  |  |  |  |  |  | 22,374 | 23,464 | 22,754
Total revenues |  |  |  |  |  |  |  |  |  | 108,044 | 108,617 | 115,017
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 32,891 | 35,256 | 39,974
Gross profit |  |  |  |  |  |  |  |  |  | 50,289 | 45,797 | 47,836
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 22,171 | 21,896 | 22,930
Income from operations |  |  |  |  |  |  |  |  |  | 28,118 | 23,901 | 24,906
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | (2,320) | (2,465) | (2,194)
Income before (benefit) provision for income taxes |  |  |  |  |  |  |  |  |  | 26,132 | 21,315 | 22,224
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 58,781 | 30,505 | 44,316
Accounts receivable, net (period end) |  | 19,581 |  |  |  | 19,506 |  |  |  | 19,581 | 19,506 | 21,784
Rental equipment, at cost (period end) |  | 262,325 |  |  |  | 245,700 |  |  |  | 262,325 | 245,700 | 262,945
Rental equipment, net book value (period end) |  | 109,482 |  |  |  | 90,172 |  |  |  | $ 109,482 | $ 90,172 | $ 102,191
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 61.70% | 61.00% | 58.70%
Average utilization | [1] |  |  |  |  |  |  |  |  | 62.90% | 60.60% | 60.50%
Adler Tanks [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | $ 64,021 | $ 58,585 | $ 68,502
Rental related services revenues |  |  |  |  |  |  |  |  |  | 24,762 | 23,807 | 24,643
Sales and other revenues |  |  |  |  |  |  |  |  |  | 2,572 | 1,438 | 1,486
Total revenues |  |  |  |  |  |  |  |  |  | 91,355 | 83,830 | 94,631
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 15,770 | 15,940 | 15,993
Gross profit |  |  |  |  |  |  |  |  |  | 43,218 | 37,409 | 47,397
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 29,542 | 27,610 | 27,494
Income from operations |  |  |  |  |  |  |  |  |  | 13,676 | 9,799 | 19,903
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | (3,071) | (3,200) | (2,729)
Income before (benefit) provision for income taxes |  |  |  |  |  |  |  |  |  | 10,605 | 6,599 | 17,174
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 4,800 | 1,030 | 9,440
Accounts receivable, net (period end) |  | 18,663 |  |  |  | 16,150 |  |  |  | 18,663 | 16,150 | 17,955
Rental equipment, at cost (period end) |  | 309,808 |  |  |  | 306,701 |  |  |  | 309,808 | 306,701 | 310,263
Rental equipment, net book value (period end) |  | 208,981 |  |  |  | 221,778 |  |  |  | $ 208,981 | $ 221,778 | $ 237,927
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 57.50% | 50.70% | 49.70%
Average utilization | [1] |  |  |  |  |  |  |  |  | 56.00% | 50.10% | 58.30%
Enviroplex [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales and other revenues | [2] |  |  |  |  |  |  |  |  | $ 31,369 | $ 22,121 | $ 10,612
Total revenues | [2] |  |  |  |  |  |  |  |  | 31,369 | 22,121 | 10,612
Gross profit | [2] |  |  |  |  |  |  |  |  | 8,903 | 7,145 | 2,903
Selling and administrative expenses | [2] |  |  |  |  |  |  |  |  | 4,309 | 3,970 | 3,030
Income from operations | [2] |  |  |  |  |  |  |  |  | 4,594 | 3,175 | (127)
Interest expense (income) allocation | [2] |  |  |  |  |  |  |  |  | 440 | 262 | 194
Income before (benefit) provision for income taxes | [2] |  |  |  |  |  |  |  |  | 5,034 | 3,437 | 67
Accounts receivable, net (period end) | [2] | $ 8,354 |  |  |  | $ 5,305 |  |  |  | $ 8,354 | $ 5,305 | $ 1,728
[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 $31,369, $22,206 and $11,530 in 2017, 2016 and 2015, respectively, which includes inter-segment sales to Mobile Modular of $0, $85 and $918, which have been eliminated in consolidation.

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