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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  | $ 70,352 | $ 67,757 | $ 66,747 | $ 66,532 | $ 70,694 | $ 70,195 | $ 67,305 | $ 65,502 | $ 271,388 | $ 273,696 | $ 269,575
Rental related services revenues |  |  |  |  |  |  |  |  |  | 75,859 | 73,314 | 64,132
Sales and other revenues |  |  |  |  |  |  |  |  |  | 76,833 | 57,534 | 74,415
Total revenues |  | 105,283 | 121,993 | 103,105 | 93,699 | 105,282 | 113,048 | 96,026 | 90,188 | 424,080 | 404,544 | 408,122
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 72,197 | 75,213 | 72,678
Gross profit |  | 49,323 | 50,433 | 43,756 | 40,655 | 46,756 | 50,146 | 40,918 | 39,087 | 184,167 | 176,907 | 182,219
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 104,908 | 99,950 | 96,859
Income (loss) from operations |  | 22,696 | 24,232 | 18,073 | 14,258 | 21,467 | 25,150 | 16,465 | 13,875 | 79,259 | 76,957 | 85,360
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | (12,207) | (10,092) | 9,280
Income before provision for income taxes |  | 19,795 | 21,277 | 15,006 | 10,853 | 18,523 | 22,505 | 14,033 | 11,316 | 66,931 | 66,377 | 76,561
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 74,634 | 133,378 | 148,602
Accounts receivable, net (period end) |  | 96,877 |  |  |  | 95,017 |  |  |  | 96,877 | 95,017 | 101,156
Rental equipment, at cost (period end) |  | 1,324,057 |  |  |  | 1,310,083 |  |  |  | 1,324,057 | 1,310,083 | 1,229,638
Rental equipment, net book value (period end) |  | 856,371 | $ 862,528 | $ 868,422 | $ 867,215 | 869,601 | $ 864,277 | $ 856,489 | $ 839,078 | 856,371 | 869,601 | 825,750
Mobile Modular [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | 130,496 | 115,986 | 96,457
Rental related services revenues |  |  |  |  |  |  |  |  |  | 49,206 | 45,616 | 35,263
Sales and other revenues |  |  |  |  |  |  |  |  |  | 29,810 | 22,682 | 29,855
Total revenues |  |  |  |  |  |  |  |  |  | 209,512 | 184,284 | 161,575
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 21,001 | 19,246 | 16,536
Gross profit |  |  |  |  |  |  |  |  |  | 93,816 | 78,771 | 63,455
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 51,432 | 46,496 | 42,069
Income (loss) from operations |  |  |  |  |  |  |  |  |  | 42,384 | 32,275 | 21,386
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | (6,804) | (5,363) | 4,768
Income before provision for income taxes |  |  |  |  |  |  |  |  |  | 35,580 | 26,912 | 16,959
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 43,099 | 79,622 | 82,792
Accounts receivable, net (period end) |  | 55,916 |  |  |  | 53,550 |  |  |  | 55,916 | 53,550 | 46,659
Rental equipment, at cost (period end) |  | 769,190 |  |  |  | 736,875 |  |  |  | 769,190 | 736,875 | 664,340
Rental equipment, net book value (period end) |  | 544,421 |  |  |  | 529,483 |  |  |  | $ 544,421 | $ 529,483 | $ 473,960
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 77.30% | 76.90% | 75.00%
Average utilization | [1] |  |  |  |  |  |  |  |  | 76.60% | 75.80% | 72.30%
TRS-RenTelco [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | $ 82,307 | $ 89,208 | $ 99,020
Rental related services revenues |  |  |  |  |  |  |  |  |  | 2,846 | 3,055 | 3,331
Sales and other revenues |  |  |  |  |  |  |  |  |  | 23,464 | 22,754 | 25,951
Total revenues |  |  |  |  |  |  |  |  |  | 108,617 | 115,017 | 128,302
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 35,256 | 39,974 | 40,935
Gross profit |  |  |  |  |  |  |  |  |  | 45,797 | 47,836 | 60,249
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 21,896 | 22,930 | 23,736
Income (loss) from operations |  |  |  |  |  |  |  |  |  | 23,901 | 24,906 | 36,513
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | (2,465) | (2,194) | 2,075
Income before provision for income taxes |  |  |  |  |  |  |  |  |  | 21,315 | 22,224 | 34,383
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 30,505 | 44,316 | 45,158
Accounts receivable, net (period end) |  | 19,506 |  |  |  | 21,784 |  |  |  | 19,506 | 21,784 | 28,849
Rental equipment, at cost (period end) |  | 246,325 |  |  |  | 262,945 |  |  |  | 246,325 | 262,945 | 261,995
Rental equipment, net book value (period end) |  | 90,172 |  |  |  | 102,191 |  |  |  | $ 90,172 | $ 102,191 | $ 105,729
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 61.00% | 58.70% | 59.80%
Average utilization | [1] |  |  |  |  |  |  |  |  | 60.60% | 60.50% | 60.40%
Adler Tanks [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | $ 58,585 | $ 68,502 | $ 74,098
Rental related services revenues |  |  |  |  |  |  |  |  |  | 23,807 | 24,643 | 25,538
Sales and other revenues |  |  |  |  |  |  |  |  |  | 1,438 | 1,486 | 1,152
Total revenues |  |  |  |  |  |  |  |  |  | 83,830 | 94,631 | 100,788
Depreciation of rental equipment |  |  |  |  |  |  |  |  |  | 15,940 | 15,993 | 15,207
Gross profit |  |  |  |  |  |  |  |  |  | 37,409 | 47,397 | 53,452
Selling and administrative expenses |  |  |  |  |  |  |  |  |  | 27,610 | 27,494 | 27,424
Income (loss) from operations |  |  |  |  |  |  |  |  |  | 9,799 | 19,903 | 26,028
Interest expense (income) allocation |  |  |  |  |  |  |  |  |  | (3,200) | (2,729) | 2,618
Income before provision for income taxes |  |  |  |  |  |  |  |  |  | 6,599 | 17,174 | 23,605
Rental equipment acquisitions |  |  |  |  |  |  |  |  |  | 1,030 | 9,440 | 20,652
Accounts receivable, net (period end) |  | 16,150 |  |  |  | 17,955 |  |  |  | 16,150 | 17,955 | 21,031
Rental equipment, at cost (period end) |  | 308,542 |  |  |  | 310,263 |  |  |  | 308,542 | 310,263 | 303,303
Rental equipment, net book value (period end) |  | 221,778 |  |  |  | 237,927 |  |  |  | $ 221,778 | $ 237,927 | $ 246,061
Utilization (period end) | [1] |  |  |  |  |  |  |  |  | 50.70% | 49.70% | 63.90%
Average utilization | [1] |  |  |  |  |  |  |  |  | 50.10% | 58.30% | 62.90%
Enviroplex [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales and other revenues | [2] |  |  |  |  |  |  |  |  | $ 22,121 | $ 10,612 | $ 17,457
Total revenues | [2] |  |  |  |  |  |  |  |  | 22,121 | 10,612 | 17,457
Gross profit | [2] |  |  |  |  |  |  |  |  | 7,145 | 2,903 | 5,063
Selling and administrative expenses | [2] |  |  |  |  |  |  |  |  | 3,970 | 3,030 | 3,630
Income (loss) from operations | [2] |  |  |  |  |  |  |  |  | 3,175 | (127) | 1,433
Interest expense (income) allocation | [2] |  |  |  |  |  |  |  |  | 262 | 194 | (181)
Income before provision for income taxes | [2] |  |  |  |  |  |  |  |  | 3,437 | 67 | 1,614
Accounts receivable, net (period end) | [2] | $ 5,305 |  |  |  | $ 1,728 |  |  |  | $ 5,305 | $ 1,728 | $ 4,617
[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 $22,206, $11,530 and $19,017 in 2016, 2015 and 2014, respectively, which includes inter-segment sales to Mobile Modular of $85, $918 and $1,560, which have been eliminated in consolidation.

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