Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023		Jun. 30, 2022		Dec. 31, 2022
Segment Reporting Information [Line Items]
Rental revenues				$ 234,607		$ 214,865
Rental related services revenues				63,573		53,136
Sales and other revenues				78,006		54,403
Total revenues		$ 203,030	$ 177,031	376,186		322,404
Depreciation of rental equipment				45,755		47,938
Gross profit				176,642		144,326
Selling and administrative expenses				107,106		79,915
Income (loss) from operations				69,536		64,411
Interest (expense) income allocation				(17,783)		(5,821)
Income (loss) before provision for income taxes				51,961		58,422
Adjusted EBITDA				142,400		123,010
Rental equipment acquisitions				122,481		95,976
Accounts receivable, net (period end)		191,676	167,329	191,676		167,329		$ 169,937
Rental equipment, at cost (period end)		1,848,816	1,774,291	1,848,816		1,774,291		1,521,535
Rental equipment, net book value (period end)		1,295,650	1,097,525	1,295,650		1,097,525		$ 990,317
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Rental revenues				170,370		126,487
Rental related services revenues				59,442		39,594
Sales and other revenues				61,107		35,941
Total revenues		164,262	111,377	290,919		202,022
Depreciation of rental equipment				19,729		15,582
Gross profit				140,226		92,820
Selling and administrative expenses				84,810		50,447
Income (loss) from operations				55,416		42,373
Interest (expense) income allocation				(14,718)		(3,821)
Income (loss) before provision for income taxes				40,698		38,552
Adjusted EBITDA				99,269		66,178
Rental equipment acquisitions				105,575		51,575
Accounts receivable, net (period end)		161,927	118,865	161,927		118,865
Rental equipment, at cost (period end)		1,457,984	1,075,898	1,457,984		1,075,898
Rental equipment, net book value (period end)		1,132,778	776,003	$ 1,132,778		$ 776,003
Utilization (period end)	[1]			78.80%		78.60%
Average utilization	[1]			79.40%		77.60%
TRS-RenTelco [Member]
Segment Reporting Information [Line Items]
Rental revenues				$ 57,717		$ 58,230
Rental related services revenues				1,547		1,484
Sales and other revenues				14,701		11,118
Total revenues		37,845	37,341	73,965		70,832
Depreciation of rental equipment				24,701		24,362
Gross profit				31,503		30,826
Selling and administrative expenses				16,577		13,204
Income (loss) from operations				14,926		17,622
Interest (expense) income allocation				(3,801)		(1,232)
Income (loss) before provision for income taxes				11,333		16,222
Adjusted EBITDA				42,173		42,781
Rental equipment acquisitions				16,906		42,791
Accounts receivable, net (period end)		26,138	24,796	26,138		24,796
Rental equipment, at cost (period end)		390,832	389,383	390,832		389,383
Rental equipment, net book value (period end)		162,872	177,038	$ 162,872		$ 177,038
Utilization (period end)	[1]			58.30%		65.30%
Average utilization	[1]			58.70%		64.60%
Adler Tanks [Member]
Segment Reporting Information [Line Items]
Total revenues			23,663	$ 9,438		$ 43,983
Adler Tanks (Discontinued) [Member]
Segment Reporting Information [Line Items]
Rental revenues	[2]			6,520		30,148
Rental related services revenues	[2]			2,584		12,058
Sales and other revenues	[2]			334		1,777
Total revenues	[2]			9,438		43,983
Depreciation of rental equipment	[2]			1,325		7,994
Gross profit	[2]			4,665		19,335
Selling and administrative expenses	[2]			2,583		13,501
Income (loss) from operations	[2]			2,082		5,834
Interest (expense) income allocation	[2]			(374)		(1,119)
Income (loss) before provision for income taxes	[2]			1,709		4,715
Adjusted EBITDA	[2]			3,682		15,327
Rental equipment acquisitions	[2]					1,610
Accounts receivable, net (period end)	[2]		17,248			17,248
Rental equipment, at cost (period end)	[2]		309,010			309,010
Rental equipment, net book value (period end)	[2]		144,484			144,484
Enviroplex [Member]
Segment Reporting Information [Line Items]
Sales and other revenues	[3]			1,864		5,567
Total revenues		923	4,650	1,864	[3]	5,567	[3]
Gross profit	[3]			248		1,345
Selling and administrative expenses	[3]			3,137		2,763
Income (loss) from operations	[3]			(2,889)		(1,418)
Interest (expense) income allocation	[3]			1,110		351
Income (loss) before provision for income taxes	[3]			(1,779)		(1,067)
Adjusted EBITDA	[3]			(2,724)		(1,276)
Accounts receivable, net (period end)	[3]	$ 3,611	$ 6,420	$ 3,611		$ 6,420

[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 $1,871 and $6,423 for the six months ended June 30, 2023 and 2022, respectively. There were $7 inter-segment sales to Mobile Modular in the six months ended June 30, 2023 and $856 inter-segment sales during the same period in 2022, which required elimination in consolidation.