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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental Revenues | $ 66,181 | $ 65,941 | $ 63,043 | $ 60,601 | $ 65,117 | $ 63,418 | $ 60,389 | $ 59,520 | $ 255,766 | $ 248,444 | $ 234,906
Rental Related Services Revenues |  |  |  |  |  |  |  |  | 53,148 | 46,920 | 39,486
Sales and Other Revenues |  |  |  |  |  |  |  |  | 70,406 | 68,710 | 68,278
Total Revenues | 94,614 | 108,860 | 87,133 | 88,713 | 101,950 | 99,430 | 83,765 | 78,929 | 379,320 | 364,074 | 342,670
Depreciation of Rental Equipment |  |  |  |  |  |  |  |  | 68,208 | 63,819 | 60,187
Gross Profit | 44,472 | 45,210 | 40,146 | 38,998 | 44,039 | 43,640 | 40,780 | 39,835 | 168,826 | 168,294 | 166,791
Interest Expense (Income) Allocation |  |  |  |  |  |  |  |  | 8,687 | 9,149 | 7,606
Income (Loss) before Provision for Income Taxes | 19,341 | 20,679 | 16,197 | 15,157 | 18,851 | 20,480 | 17,235 | 16,301 | 71,374 | 72,867 | 81,058
Rental Equipment Acquisitions |  |  |  |  |  |  |  |  | 136,601 | 128,754 | 157,754
Accounts Receivable, net (period end) | 87,650 |  |  |  | 92,256 |  |  |  | 87,650 | 92,256 | 92,671
Rental Equipment, at cost (period end) | 1,144,168 |  |  |  | 1,072,845 |  |  |  | 1,144,168 | 1,072,845 | 999,189
Rental Equipment, net book value (period end) | 767,010 | 753,810 | 737,636 | 726,100 | 718,853 | 719,636 | 710,918 | 693,577 | 767,010 | 718,853 | 673,146
Operating Segments [Member] | Mobile Modular [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental Revenues |  |  |  |  |  |  |  |  | 82,503 | 79,518 | 79,969
Rental Related Services Revenues |  |  |  |  |  |  |  |  | 28,891 | 25,775 | 24,063
Sales and Other Revenues |  |  |  |  |  |  |  |  | 21,267 | 14,474 | 20,577
Total Revenues |  |  |  |  |  |  |  |  | 132,661 | 119,767 | 124,609
Depreciation of Rental Equipment |  |  |  |  |  |  |  |  | 14,459 | 13,942 | 13,780
Gross Profit |  |  |  |  |  |  |  |  | 50,423 | 52,022 | 55,193
Interest Expense (Income) Allocation |  |  |  |  |  |  |  |  | 4,318 | 4,547 | 4,036
Income (Loss) before Provision for Income Taxes |  |  |  |  |  |  |  |  | 9,617 | 13,443 | 19,026
Rental Equipment Acquisitions |  |  |  |  |  |  |  |  | 52,953 | 21,042 | 33,824
Accounts Receivable, net (period end) | 37,163 |  |  |  | 39,066 |  |  |  | 37,163 | 39,066 | 44,013
Rental Equipment, at cost (period end) | 592,391 |  |  |  | 551,101 |  |  |  | 592,391 | 551,101 | 539,147
Rental Equipment, net book value (period end) | 415,366 |  |  |  | 384,813 |  |  |  | 415,366 | 384,813 | 383,621
Utilization (period end) |  |  |  |  |  |  |  |  | 70.70% | 66.70% | 67.30%
Average Utilization |  |  |  |  |  |  |  |  | 68.30% | 66.40% | 67.10%
Operating Segments [Member] | TRS-RenTelco [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental Revenues |  |  |  |  |  |  |  |  | 102,101 | 101,645 | 95,694
Rental Related Services Revenues |  |  |  |  |  |  |  |  | 3,095 | 3,673 | 3,133
Sales and Other Revenues |  |  |  |  |  |  |  |  | 29,668 | 27,855 | 26,488
Total Revenues |  |  |  |  |  |  |  |  | 134,864 | 133,173 | 125,315
Depreciation of Rental Equipment |  |  |  |  |  |  |  |  | 39,953 | 38,174 | 38,039
Gross Profit |  |  |  |  |  |  |  |  | 63,331 | 62,083 | 57,069
Interest Expense (Income) Allocation |  |  |  |  |  |  |  |  | 2,156 | 2,384 | 2,124
Income (Loss) before Provision for Income Taxes |  |  |  |  |  |  |  |  | 36,633 | 33,631 | 29,024
Rental Equipment Acquisitions |  |  |  |  |  |  |  |  | 52,625 | 51,793 | 55,302
Accounts Receivable, net (period end) | 27,328 |  |  |  | 24,654 |  |  |  | 27,328 | 24,654 | 24,236
Rental Equipment, at cost (period end) | 267,772 |  |  |  | 266,934 |  |  |  | 267,772 | 266,934 | 258,586
Rental Equipment, net book value (period end) | 109,988 |  |  |  | 107,999 |  |  |  | 109,988 | 107,999 | 105,565
Utilization (period end) |  |  |  |  |  |  |  |  | 58.20% | 64.10% | 67.10%
Average Utilization |  |  |  |  |  |  |  |  | 62.70% | 65.80% | 66.00%
Operating Segments [Member] | Adler Tanks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental Revenues |  |  |  |  |  |  |  |  | 71,162 | 67,281 | 59,243
Rental Related Services Revenues |  |  |  |  |  |  |  |  | 21,162 | 17,472 | 12,290
Sales and Other Revenues |  |  |  |  |  |  |  |  | 1,616 | 2,558 | 425
Total Revenues |  |  |  |  |  |  |  |  | 93,940 | 87,311 | 71,958
Depreciation of Rental Equipment |  |  |  |  |  |  |  |  | 13,796 | 11,703 | 8,368
Gross Profit |  |  |  |  |  |  |  |  | 51,076 | 51,157 | 49,619
Interest Expense (Income) Allocation |  |  |  |  |  |  |  |  | 2,419 | 2,350 | 1,659
Income (Loss) before Provision for Income Taxes |  |  |  |  |  |  |  |  | 24,013 | 26,706 | 31,262
Rental Equipment Acquisitions |  |  |  |  |  |  |  |  | 31,023 | 55,919 | 68,628
Accounts Receivable, net (period end) | 21,915 |  |  |  | 24,323 |  |  |  | 21,915 | 24,323 | 19,226
Rental Equipment, at cost (period end) | 284,005 |  |  |  | 254,810 |  |  |  | 284,005 | 254,810 | 201,456
Rental Equipment, net book value (period end) | 241,656 |  |  |  | 226,041 |  |  |  | 241,656 | 226,041 | 183,960
Utilization (period end) |  |  |  |  |  |  |  |  | 57.70% | 67.50% | 79.80%
Average Utilization |  |  |  |  |  |  |  |  | 64.20% | 71.50% | 86.20%
Operating Segments [Member] | Enviroplex [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental Revenues |  |  |  |  |  |  |  |  |  |  |
Rental Related Services Revenues |  |  |  |  |  |  |  |  |  |  |
Sales and Other Revenues |  |  |  |  |  |  |  |  | 17,855 | 23,823 | 20,788
Total Revenues |  |  |  |  |  |  |  |  | 17,855 | 23,823 | 20,788
Depreciation of Rental Equipment |  |  |  |  |  |  |  |  |  |  |
Gross Profit |  |  |  |  |  |  |  |  | 3,996 | 3,032 | 4,910
Interest Expense (Income) Allocation |  |  |  |  |  |  |  |  | (206) | (132) | (213)
Income (Loss) before Provision for Income Taxes |  |  |  |  |  |  |  |  | 1,111 | (913) | 1,746
Rental Equipment Acquisitions |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, net (period end) | 1,244 |  |  |  | 4,213 |  |  |  | 1,244 | 4,213 | 5,197
Rental Equipment, at cost (period end) |  |  |  |  |  |  |  |  |  |  |
Rental Equipment, net book value (period end) |  |  |  |  |  |  |  |  |  |  |

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