Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Rental revenues		$ 116,767	$ 104,241
Rental related services revenues		29,716	24,317
Sales and other revenues		26,673	16,815
Total revenues		173,156	145,373
Depreciation of rental equipment		23,158	23,874
Gross profit		82,032	66,489
Selling and administrative expenses		60,080	39,127
Income (loss) from operations		21,952	27,362
Interest (expense) income allocation		(7,838)	(2,820)
Income (loss) before provision for income taxes		14,340	24,555
Adjusted EBITDA		65,432	56,719
Rental equipment acquisitions		70,229	46,548
Accounts receivable, net (period end)		177,006	151,564	$ 169,937
Rental equipment, at cost (period end)		1,813,885	1,746,586	1,521,535
Rental equipment, net book value (period end)		1,267,268	1,082,955	$ 990,317
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Rental revenues		81,113	61,538
Rental related services revenues		26,252	18,361
Sales and other revenues		19,292	10,746
Total revenues		126,657	90,645
Depreciation of rental equipment		9,444	7,833
Gross profit		61,622	43,141
Selling and administrative expenses		46,514	24,692
Income (loss) from operations		15,108	18,449
Interest (expense) income allocation		(6,271)	(1,821)
Income (loss) before provision for income taxes		8,837	16,628
Adjusted EBITDA		42,445	30,405
Rental equipment acquisitions		60,117	23,088
Accounts receivable, net (period end)		148,880	106,682
Rental equipment, at cost (period end)		1,412,084	1,059,030
Rental equipment, net book value (period end)		$ 1,096,164	$ 763,710
Utilization (period end)	[1]	78.90%	77.60%
Average utilization	[1]	79.60%	77.10%
TRS-RenTelco [Member]
Segment Reporting Information [Line Items]
Rental revenues		$ 29,134	$ 28,512
Rental related services revenues		880	671
Sales and other revenues		6,106	4,308
Total revenues		36,120	33,491
Depreciation of rental equipment		12,389	12,029
Gross profit		15,620	14,690
Selling and administrative expenses		9,451	6,590
Income (loss) from operations		6,169	8,100
Interest (expense) income allocation		(1,742)	(586)
Income (loss) before provision for income taxes		4,653	7,527
Adjusted EBITDA		20,635	20,653
Rental equipment acquisitions		10,112	23,351
Accounts receivable, net (period end)		24,493	25,124
Rental equipment, at cost (period end)		401,801	378,766
Rental equipment, net book value (period end)		$ 171,104	$ 171,863
Utilization (period end)	[1]	59.00%	64.70%
Average utilization	[1]	59.20%	64.60%
Adler Tanks [Member]
Segment Reporting Information [Line Items]
Rental revenues	[2]	$ 6,520	$ 14,191
Rental related services revenues	[2]	2,584	5,285
Sales and other revenues	[2]	334	844
Total revenues	[2]	9,438	20,320
Depreciation of rental equipment	[2]	1,325	4,012
Gross profit	[2]	4,665	8,454
Selling and administrative expenses	[2]	2,582	6,522
Income (loss) from operations	[2]	2,083	1,932
Interest (expense) income allocation	[2]	(374)	(544)
Income (loss) before provision for income taxes	[2]	1,709	1,388
Adjusted EBITDA	[2]	3,682	6,707
Rental equipment acquisitions	[2]		109
Accounts receivable, net (period end)	[2]		14,788
Rental equipment, at cost (period end)	[2]		308,790
Rental equipment, net book value (period end)	[2]		$ 147,382
Utilization (period end)	[1],[2]		50.40%
Average utilization	[1],[2]		48.30%
Enviroplex [Member]
Segment Reporting Information [Line Items]
Sales and other revenues	[3]	941	$ 917
Total revenues	[3]	941	917
Gross profit	[3]	125	204
Selling and administrative expenses	[3]	1,533	1,323
Income (loss) from operations	[3]	(1,408)	(1,119)
Interest (expense) income allocation	[3]	549	131
Income (loss) before provision for income taxes	[3]	(859)	(988)
Adjusted EBITDA	[3]	(1,330)	(1,046)
Accounts receivable, net (period end)	[3]	$ 3,633	$ 4,970

[1] Utilization is calculated each month by dividing the cost of rental equipment on rent by the total cost of rental equipment, excluding accessory equipment, and new equipment inventory. The Average utilization for the period is calculated using the average costs of rental equipment.

[2] The financial results of Adler Tanks included in this table are through the date of the business divestiture, which occurred on February 1, 2023.

[3] Gross Enviroplex sales revenues were $941 and $917 for the three months ended March 31, 2023 and 2022, respectively. There were no inter-segment sales to Mobile Modular in the three months ended March 31, 2023 and 2022, which required elimination in consolidation.