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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  | $ 70,694 | $ 70,195 | $ 67,305 | $ 65,502 | $ 71,694 | $ 69,642 | $ 65,809 | $ 62,430 | $ 273,696 | $ 269,575 | $ 255,766
Rental related services revenues |  |  |  |  |  |  |  |  |  | 73,314 | 64,132 | 53,148
Sales and other revenues |  |  |  |  |  |  |  |  |  | 57,534 | 74,415 | 70,595
Total revenues |  | 105,282 | 113,048 | 96,026 | 90,188 | 111,792 | 113,025 | 95,745 | 87,560 | 404,544 | 408,122 | 379,509
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 75,213 | 72,678 | 68,208
Gross profit |  | 46,756 | 50,146 | 40,918 | 39,087 | 52,204 | 49,298 | 42,079 | 38,638 | 176,907 | 182,219 | 169,015
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 99,950 | 96,859 | 88,765
Income (loss) from operation |  | 21,467 | 25,150 | 16,465 | 13,875 | 26,796 | 25,098 | 18,239 | 15,227 | 76,957 | 85,360 | 80,250
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | (10,092) | 9,280 | 8,687
Income before provision for income taxes |  | 18,523 | 22,505 | 14,033 | 11,316 | 24,222 | 22,609 | 16,794 | 12,936 | 66,377 | 76,561 | 71,374
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 133,378 | 148,602 | 136,601
Accounts receivable, net (period end) |  | 95,263 |  |  |  | 101,294 |  |  |  | 95,263 | 101,294 | 87,650
Rental equipment, at cost (period end) |  | 1,310,083 |  |  |  | 1,229,638 |  |  |  | 1,310,083 | 1,229,638 | 1,144,168
Rental equipment, net book value (period end) |  | 869,601 | $ 864,277 | $ 856,489 | $ 839,078 | 825,750 | $ 817,898 | $ 795,532 | $ 775,875 | 869,601 | 825,750 | 767,010
Mobile Modular [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | 115,986 | 96,457 | 82,503
Rental related services revenues |  |  |  |  |  |  |  |  |  | 45,616 | 35,263 | 28,891
Sales and other revenues |  |  |  |  |  |  |  |  |  | 22,682 | 29,855 | 21,267
Total revenues |  |  |  |  |  |  |  |  |  | 184,284 | 161,575 | 132,661
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 19,246 | 16,536 | 14,459
Gross profit |  |  |  |  |  |  |  |  |  | 78,771 | 63,455 | 50,423
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 46,496 | 42,069 | 36,488
Income (loss) from operation |  |  |  |  |  |  |  |  |  | 32,275 | 21,386 | 13,935
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | (5,363) | 4,768 | 4,318
Income before provision for income taxes |  |  |  |  |  |  |  |  |  | 26,912 | 16,959 | 9,617
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 79,622 | 82,792 | 52,953
Accounts receivable, net (period end) |  | 53,796 |  |  |  | 46,797 |  |  |  | 53,796 | 46,797 | 37,163
Rental equipment, at cost (period end) |  | 736,875 |  |  |  | 664,340 |  |  |  | 736,875 | 664,340 | 592,391
Rental equipment, net book value (period end) |  | 529,483 |  |  |  | 473,960 |  |  |  | $ 529,483 | $ 473,960 | $ 415,366
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 76.90% | 75.00% | 70.70%
Average utilization | [1] |  |  |  |  |  |  |  |  | 75.80% | 72.30% | 68.30%
TRS-RenTelco [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | $ 89,208 | $ 99,020 | $ 102,101
Rental related services revenues |  |  |  |  |  |  |  |  |  | 3,055 | 3,331 | 3,095
Sales and other revenues |  |  |  |  |  |  |  |  |  | 22,754 | 25,951 | 29,857
Total revenues |  |  |  |  |  |  |  |  |  | 115,017 | 128,302 | 135,053
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 39,974 | 40,935 | 39,953
Gross profit |  |  |  |  |  |  |  |  |  | 47,836 | 60,249 | 63,520
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 22,930 | 23,736 | 24,542
Income (loss) from operation |  |  |  |  |  |  |  |  |  | 24,906 | 36,513 | 38,978
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | (2,194) | 2,075 | 2,156
Income before provision for income taxes |  |  |  |  |  |  |  |  |  | 22,224 | 34,383 | 36,633
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 44,316 | 45,158 | 52,625
Accounts receivable, net (period end) |  | 21,784 |  |  |  | 28,849 |  |  |  | 21,784 | 28,849 | 27,328
Rental equipment, at cost (period end) |  | 262,945 |  |  |  | 261,995 |  |  |  | 262,945 | 261,995 | 267,772
Rental equipment, net book value (period end) |  | 102,191 |  |  |  | 105,729 |  |  |  | $ 102,191 | $ 105,729 | $ 109,988
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 58.70% | 59.80% | 58.20%
Average utilization | [1] |  |  |  |  |  |  |  |  | 60.50% | 60.40% | 62.70%
Adler Tanks [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | $ 68,502 | $ 74,098 | $ 71,162
Rental related services revenues |  |  |  |  |  |  |  |  |  | 24,643 | 25,538 | 21,162
Sales and other revenues |  |  |  |  |  |  |  |  |  | 1,486 | 1,152 | 1,616
Total revenues |  |  |  |  |  |  |  |  |  | 94,631 | 100,788 | 93,940
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 15,993 | 15,207 | 13,796
Gross profit |  |  |  |  |  |  |  |  |  | 47,397 | 53,452 | 51,076
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 27,494 | 27,424 | 24,644
Income (loss) from operation |  |  |  |  |  |  |  |  |  | 19,903 | 26,028 | 26,432
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | (2,729) | 2,618 | 2,419
Income before provision for income taxes |  |  |  |  |  |  |  |  |  | 17,174 | 23,605 | 24,013
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 9,440 | 20,652 | 31,023
Accounts receivable, net (period end) |  | 17,955 |  |  |  | 21,031 |  |  |  | 17,955 | 21,031 | 21,915
Rental equipment, at cost (period end) |  | 310,263 |  |  |  | 303,303 |  |  |  | 310,263 | 303,303 | 284,005
Rental equipment, net book value (period end) |  | 237,927 |  |  |  | 246,061 |  |  |  | $ 237,927 | $ 246,061 | $ 241,656
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 49.70% | 63.90% | 57.70%
Average utilization | [1] |  |  |  |  |  |  |  |  | 58.30% | 62.90% | 64.20%
Enviroplex [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales and other revenues | [2] |  |  |  |  |  |  |  |  | $ 10,612 | $ 17,457 | $ 17,855
Total revenues | [2] |  |  |  |  |  |  |  |  | 10,612 | 17,457 | 17,855
Gross profit | [2] |  |  |  |  |  |  |  |  | 2,903 | 5,063 | 3,996
Selling and administrative expenses | [2] |  |  |  |  |  |  |  |  | 3,030 | 3,630 | 3,091
Income (loss) from operation | [2] |  |  |  |  |  |  |  |  | (127) | 1,433 | 905
Interest expense (income) allocation | [2] |  |  |  |  |  |  |  |  | 194 | (181) | (206)
Income before provision for income taxes | [2] |  |  |  |  |  |  |  |  | 67 | 1,614 | 1,111
Accounts receivable, net (period end) | [2] | $ 1,728 |  |  |  | $ 4,617 |  |  |  | $ 1,728 | $ 4,617 | $ 1,244
[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 $11,530, $19,017 and $17,859 in 2015, 2014 and 2013, respectively, which includes inter-segment sales to Mobile Modular of $918, $1,560 and $4, which have been eliminated in consolidation.

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