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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Rental revenues $ 390,013 $ 351,790 $ 353,889
Rental related services revenues 98,061 92,393 101,038
Sales and other revenues 128,759 128,371 115,303
Total revenues 616,833 572,554 570,230
Depreciation of rental equipment 91,887 85,866 80,391
Gross profit 281,021 263,746 266,165
Selling and administrative expenses 148,600 122,993 124,793
Income from operations 132,421 140,753 141,372
Interest expense (income) allocation 10,455 8,787 12,331
Income before provision/benefit for income taxes 121,756 132,044 129,125
Adjusted EBITDA 246,572 241,023 236,823
Rental equipment acquisitions 249,680 84,207 170,018
Accounts receivable, net (period end) 159,499 123,316 128,099
Rental equipment, at cost (period end) 1,711,393 1,530,841 1,520,411
Rental equipment, net book value (period end) 1,065,224 938,116 967,500
Mobile Modular [Member]      
Segment Reporting Information [Line Items]      
Rental revenues 220,569 188,719 182,316
Rental related services revenues 72,330 67,527 69,395
Sales and other revenues 70,417 65,278 49,299
Total revenues 363,316 321,524 301,010
Depreciation of rental equipment 28,071 22,967 22,071
Gross profit 176,040 155,874 143,618
Selling and administrative expenses 92,603 68,470 65,699
Income from operations 83,436 87,404 77,919
Interest expense (income) allocation 6,433 5,104 7,946
Income before provision/benefit for income taxes 77,003 82,300 69,973
Adjusted EBITDA 128,044 119,202 107,166
Rental equipment acquisitions 188,392 39,078 75,433
Accounts receivable, net (period end) 112,295 81,640 83,182
Rental equipment, at cost (period end) 1,040,094 882,115 868,807
Rental equipment, net book value (period end) $ 751,537 $ 611,590 $ 610,048
Utilization (period end) [1] 76.40% 76.00% 79.10%
Average utilization [1] 76.20% 77.20% 79.20%
TRS-RenTelco [Member]      
Segment Reporting Information [Line Items]      
Rental revenues $ 113,419 $ 109,083 $ 103,704
Rental related services revenues 2,880 3,080 3,260
Sales and other revenues 23,895 28,648 24,519
Total revenues 140,194 140,811 131,483
Depreciation of rental equipment 47,374 46,472 41,948
Gross profit 61,394 60,864 60,748
Selling and administrative expenses 25,152 24,306 24,645
Income from operations 36,243 36,558 36,103
Interest expense (income) allocation 2,270 2,133 1,970
Income before provision/benefit for income taxes 33,763 34,503 34,217
Adjusted EBITDA 85,723 85,082 80,772
Rental equipment acquisitions 61,097 42,588 89,759
Accounts receivable, net (period end) 22,115 22,735 23,788
Rental equipment, at cost (period end) 361,391 333,020 335,343
Rental equipment, net book value (period end) $ 161,900 $ 156,536 $ 172,413
Utilization (period end) [1] 62.90% 67.40% 64.50%
Average utilization [1] 67.00% 66.20% 66.20%
Adler Tanks [Member]      
Segment Reporting Information [Line Items]      
Rental revenues $ 56,025 $ 53,988 $ 67,869
Rental related services revenues 22,851 21,786 28,383
Sales and other revenues 3,366 1,708 1,671
Total revenues 82,242 77,482 97,923
Depreciation of rental equipment 16,442 16,427 16,372
Gross profit 33,699 34,079 47,014
Selling and administrative expenses 25,542 24,764 29,321
Income from operations 8,157 9,315 17,693
Interest expense (income) allocation 2,211 2,107 3,436
Income before provision/benefit for income taxes 5,946 7,208 14,257
Adjusted EBITDA 27,961 29,010 38,993
Rental equipment acquisitions 191 2,541 4,826
Accounts receivable, net (period end) 16,378 13,655 17,281
Rental equipment, at cost (period end) 309,908 315,706 316,261
Rental equipment, net book value (period end) $ 151,787 $ 169,990 $ 185,039
Utilization (period end) [1] 47.60% 39.80% 48.40%
Average utilization [1] 45.40% 44.60% 54.70%
Enviroplex [Member]      
Segment Reporting Information [Line Items]      
Sales and other revenues [2] $ 31,081 $ 32,737 $ 39,814
Total revenues [2] 31,081 32,737 39,814
Gross profit [2] 9,888 12,929 14,785
Selling and administrative expenses [2] 5,303 5,453 5,128
Income from operations [2] 4,585 7,476 9,657
Interest expense (income) allocation [2] (459) (557) (1,021)
Income before provision/benefit for income taxes [2] 5,044 8,033 10,678
Adjusted EBITDA [2] 4,844 7,729 9,892
Accounts receivable, net (period end) [2] $ 8,711 $ 5,286 $ 3,848
[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 $32,095, $34,014 and $39,814 in 2021, 2020 and 2019, respectively.  There were $1,014 and $1,277 inter-segment sales to Mobile Modular in 2021 and 2020, which have been eliminated in consolidation.  There were no inter-segment sales in 2019.